Abstract: A disc brake assembly is provided with heat insulators to reduce the heat transferred to the hydraulic fluid of the disc brake assembly during braking. The disc brake assembly includes a caliper housing, a first and a second friction member coupled to the caliper housing and one or more pistons movably coupled to the caliper housing to move one or both of the friction members. The first and second friction members form a rotor receiving slot. At least the first friction member is movably coupled to the caliper housing and the piston is movably coupled to the caliper housing to move the first friction member between a release position and a braking position. Each piston has an internal recess to partially receive the heat insulator. The heat insulator is disposed between the piston and the first friction member to prevent heat transfer from the first friction member to the piston.

Abstract: A bicycle disc brake is provided in which a support member movably couples the brake caliper to the frame of the bicycle. The bicycle disc brake caliper has a caliper housing with a single piston unit. The piston unit is movably coupled to the housing between a release position, in which the piston unit is spaced from a disc brake mounted to a wheel of a bicycle, and a braking position, in which the piston unit engages the disc brake of the bicycle wheel. The piston unit has a first friction member movably coupled between a release position and a braking position and a second friction member arranged substantially parallel to the first friction member to form a disc brake receiving space between the first and second friction members. In one embodiment, the caliper housing is movably coupled to the support member by a pivot pin. In another embodiment, the caliper housing is movably coupled to the support member by a linkage assembly.

Abstract: A brake caliper has a caliper bridge and two legs that are arranged at right angles to the caliper bridge. A housing having a bore for a brake piston is mounted on one leg. The caliper bridge has at least one hollow chamber inside, which is delimited on all sides by supporting walls. Even though the brake caliper exhibits considerable flectional strength it is lightweight.

Abstract: A disc brake assembly is disclosed which incorporates a disc 50 which includes radially inner and outer portions (54 55) which are separated by a gap 56. Two pad assemblies (11, 12) are located on respective sides of the disc and are interconnected by a draw bar 29 which extends through the gap and is connected to a piston cylinder assembly. Actuation of the piston cylinder assembly imparts a force to the pad assemblies through the draw bar which causes them to move either towards or away from the disc to thereby effect actuation and release of the brake assembly. The draw bar is rotatable about its axis 71 and is releaseably coupled to the outboard pad assembly 12 so as to be operative to move between an engaged configuration with the pad assembly to a released configuration on rotation about the draw bar axis.

Abstract: A disc brake caliper including a brake piston movably arranged therein. The brake piston is sealed in relation to the brake cylinder by a sealing ring, which is arranged in a circumferential annular groove of the brake cylinder. The sealing ring functions to retract the brake piston in the brake cylinder after a braking operation in order to provide a clearance between a brake shoe and a brake disc. According to the present invention, the annular groove includes a recess, which is arranged in the area of transition between a groove wall and the cylinder surface . The contour line, which defines the cross-section of the recess, starting from the groove wall of the annular groove, passes from a convexly curved portion over into a concavely curved portion. This permits ensuring an unchangingly constant clearance between the brake shoe and the brake disc roughly irrespective of the hydraulic pressure.

Abstract: An anti-lock braking system includes a moveable member to be braked and a friction brake for applying a braking force. A controller actuates the friction brake in accordance with braking force demands. Braking force demands are determined by the controller by electrical input signals received from a signal generator that is mechanically linked to the brake pedal, as well as by signals from a slip sensor. The slip sensor records values from wheel speed sensor and computes values that may indicate a slippage condition. Based on the recorded and computed values, the slip sensor and sends electric signals to the controller. The friction brake includes a prestressed piezoelectric element that is lightweight, less cumbersome, and highly controllable as compared with prior anti-lock braking devices, and is actuated via electrical signals rather than a mechanical system.

Abstract: The present invention relates to a spot-type disc brake with a brake housing including a first side element, a second side element and a bridge element connecting the side elements and straddling a brake disc and with at least one arm arranged on the leading and/or trailing end, of the brake housing, straddling the brake disc and connecting the first side element with the second side element. The essence of the invention is that at least one side element is provided with a recess.

Abstract: The brake shoes of a disc brake having a light-metal housing are supported in a circumferential direction and are axially slidable on supports which are fixed to the housing and made of a high-strength material. The supports are cast into the housing and supporting surfaces for the brake shoes are then shaped in a subsequent machining operation.

Abstract: If cylinder bores formed in a caliper parallel to each other are communicated together through a pipe casted in the caliper, the pipe tends to come out of the caliper into a cylinder bore. A separate short pipe is provided to communicate the cylinder bores. The pipe has an engaging portion so as to extend in a diametric direction of the short pipe to prevent longitudinal shift of the short pipe. The engaging portions can be provided easily by forming a recess or a protrusion on the outer periphery of the pipe and casting the pipe in the caliper.

Abstract: A disk brake for a motor vehicle having a caliper (10) and a support (40) which slide with respect to each other to move first (17) and second (20) friction pads into engagement with a disk (30) to effect a brake application. A guide arrangement which allows the caliper (10) to slide with respect to the carrier (40) has a first guide tube (49) connected to the support (40) with a first bore (53) located at right angles to the disk (30) and an external surface (55) which slideable accomodates a first end of each of the first and second friction pads (17,20).

Abstract: A disc brake (10) with an anchor (12) fixed to a housing. The anchor (12) has non-symmetrical first (18) and second (20) rails which align first (22) and second (24) friction pads with a rotor (26). The first rail (18) has first (32) and second (34) sections with constraining surfaces (48,48') thereon separated from first bearing surfaces (50,50') by a first groove (44,44'). The second rail (20) has first (36) and second (38) sections with aligning surfaces thereon (55,55') separated from second bearing surfaces (60,60') by a second groove (53,53'). The first bearing surfaces (50,50') have a first complementary relationship with respect to aligning surfaces (55,55') and the second bearing surfaces (60,60') have a second angled complementary relationship with respect to the constraining surfaces (48,48').

Abstract: A method for changing a brake disk of a disk brake, wherein the brake disk includes a friction ring and a brake disk hub for connecting the brake disk to a wheel hub that is rotatably connected to a steering knuckle and has a wheel flange for detachably connecting a wheel, wherein a brake saddle support has two brake pads with pad supports connected thereto, wherein the brake pads cooperate with the friction ring, and wherein the brake saddle support is connected to a fastening flange of the axial body, includes a first step of removing the wheel hub from the steering knuckle by separating the wheel hub from the brake disk hub of the position-secured brake disk. The brake pads and the brake pad supports are then removed from the brake saddle support. The brake disk is then released and lowered onto the steering knuckle. The end of the brake disk opposite the brake saddle support is tilted toward the free end of the steering knuckle.

Abstract: A hydraulic caliper disk brake (10) according to the present invention includes a caliper base (46) that is supported by a folding triangular base (14) that generally includes a mounting base (30) and a support arm (54). The caliper base (46) is pinned to the mounting base (30) and the support arm (54) such that the caliper base (46) may pivot about the mounting base (30) when the pin connecting the support arm (54) to the mounting base is removed. The configuration allows the caliper assembly (12) to be pivoted out, away from a brake disk (16) such that the friction pads (142, 242) may be easily replaced. The caliper assembly (12) includes a self-activating wear adjuster (172) that functions to maintain a constant brake gap (174) between an active friction pad (142) and the brake disk (16). The caliper assembly (12) also includes a wear indicator in the form of a spring (134) that provides additional force that is fed back to the user when the friction pad (142) is significantly worn.

Abstract: A single-piece housing fixed brake caliper is provided with one relatively large piston bore on one side of the rotor and two relatively smaller piston bores on the opposing side of the rotor. The sum of the areas of the two relatively smaller pistons is equal to the area of the one relatively larger piston to provide balanced braking. The side of the caliper housing opposite the two relatively smaller bores contains two access cavities that provide clearance for the tooling that is necessarily positioned within the caliper to machine the bores. Similarly, the side of the caliper housing opposite the one relatively larger bore contains one access cavity that provides clearance for the tooling.

Abstract: A caliper assembly for controlling the rotation of a brake disk, the assembly including a caliper, a piston cylinder in the caliper on each side of the disk, a piston positioned in each of the cylinders, and a flange in the open end of each of the cylinders for supporting the piston for reciprocal motion in the cylinder, a groove on the inner side of the flange for supporting a seal ring and a groove on the outer side of the flange for supporting a wiper ring, and an opening at the end of the cylinder greater than the diameter of the piston cylinder, which allows for a much greater piston to bore angularity and prevents jamming of the piston in the cylinder.

Abstract: In order to obtain a brake caliper for a disk brake which is light and at the same time resistant to bending, the caliper is manufactured from a metal-matrix composite material having embedded ceramic particles. In order not to have to carry out the necessary subsequent machining steps in the hard composite material, it is provided according to the invention that, at least in the area of the brake cylinder and the supply connection, the caliper housing is provided with one or several inserts made of an easy to machine material, preferably an aluminum alloy.

Abstract: Generally trapezoid-shaped friction material pads can be used in conjunction with piston assemblies having torque collars with upstanding torque posts and with torque collars that have torque legs with inclined inner faces or shoulders to embrace side faces or shoulders of the pads. A retainer clip cooperates with the torque legs to prevent unwanted radial movement of the pad. A back plate of the pad has one or more tabs projecting beyond a wider base of the pad for facilitating pad removal. Tabs on the pad for indicating that a worn friction pad is due for replacement are located beyond the wider base of the pad or within the friction material pad. The friction pads are adapted for installation on module bases which include air ports on side surfaces and are constructed for interconnection that provides for air transfer between adjacent modules via the air ports.

Abstract: A set of brake pads for a floating-caliper disc brake including a first brake pad with a first retaining spring for clamping engagement on a brake piston and a second brake pad with a second retaining spring for clamping engagement on an axially external leg of the floating caliper. The first retaining spring has two resilient tongues which are locked in a bore of the hollow brake piston, and the second retaining spring has identical resilient tongues which are locked in a recess of the external housing leg. According to the present invention, the distances between the respectively opposed resilient tongues are different in conformity with the different widths of the bore and the recess, respectively. The provision according to the present invention renders it impossible to attach the first brake pad to the external housing leg and the second brake pad to the brake piston.

Abstract: A brake assembly is provided for a motor having an endbell and a hub attached to a shaft. A mounting plate is coupled to the endbell and a spacer is adjacent to the hub. A disc is attached to the hub and is disposed adjacent to the spacer opposite from the hub. A caliper is coupled to the mounting plate and is operable to engage the disc absent a signal and to disengage the disc in response to the signal.

Abstract: A disc brake apparatus comprising an annular brake disc carried by a wheel hub rotatably mounted on an axle, the brake disc being constructed of circular friction plates spaced by a plurality of vanes extending radially along an inner face of the friction plates for enhancing flow of air past the disc and for enhancing dissipation of heat from the disc. A caliper brake assembly is mounted on a stationary support, the caliper brake assembly including a caliper housing, a pair of pistons mounted in the caliper housing and a diaphragm mechanism mounted adjacent and engaging the pistons. A brake pad assembly including brake pads is mounted adjacent to the pistons on the caliper housing and a source of pressurized air communicating fluid pressure from an outside source to the caliper assembly causes an application of force to the brake pad assembly by the pistons so that the brake pads engage with opposite radial faces of the brake disc.

Abstract: A disc brake having a plurality of pistons with the same outer diameter fitted in a cylinder portion of a caliper on at least one side of a disc so that the pistons cause a pad to press against the disc. At least one of the pistons has a relatively large wall thickness so that it is different from the other pistons in pad pressing area, and its natural frequency falls outside the range of from 20 Hz to 20 kHz, thereby suppressing the generation of brake noise.

Abstract: An automotive disc brake (10) with an improved caliper assembly (14) to prevent drag of the inner brake pad (78) on the inner braking surface (40) of the rotor (16) in a hydraulically actuated automotive disc brake assembly.

Abstract: An improved fluid pressure activated piston return spring seal element is installed in a piston housing annular groove having first and second radial side walls, an axial base wall, and a mouth. The element is annular, formed of an elastomeric material, and has an axis, first and second radial faces, and an axial face. The first radial face faces toward the first side wall, defines an inwardly extending crotch region, and includes a base wall pressure sealing lip. The axial face faces toward and protrudes through the groove mouth and includes a piston pressure sealing lip and first and second angled surfaces.

Abstract: A bleeder screw for use in a disc brake assembly including a caliper provided with at least one cylindrical recess formed therein and at least one aperture formed therein. The aperture in the caliper includes a non-threaded portion and a threaded portion. A piston is slidably disposed in the recess, and a pair of brake shoes are carded by the disc brake assembly and disposed on opposite axial sides of an associated rotor. Each of the brake shoes includes a backing plate and a friction pad. An actuation system is carded by the caliper for selectively moving the brake shoes between a non-braking position, wherein each of the friction pads is spaced apart from the adjacent side of the rotor, and a braking position, wherein each of the friction pads frictionally engages the adjacent side of the rotor. The bleeder screw is threadably disposed in the aperture of the caliper. The bleeder screw includes an elastomeric seal disposed about a portion thereof.

Abstract: A trailer brake system includes a disc brake assembly for each wheel including apparatus to provide release of the brake pads from engagement with the rotor upon backing. In the preferred braking system, one master brake assembly is provided for braking one wheel and a slave brake assembly for braking a second wheel of the trailer; a self-contained hydraulic device being provided for moving the pads into and out of engagement with the rotor. Each brake assembly includes a stationary bracket for attachment to the axle and a caliper unit with the brake pads mounted by a single pivot pin on the bracket. A relief valve is engaged by the pivoting caliper unit to provide the release of the brake pads. The housing of the caliper unit is in two sections and mounted adjacent the top of the rotor.

Abstract: One of the reference surfaces used in a process for machining a bore is formed as an integrally cast surface on the outer surface of a caliper in a location corresponding to a recess of the caliper. A flat surface which is substantially parallel with the reference surface is also integrally formed at the bottom of the recess when casting the caliper. The reference surface and the flat surface are used as contact surfaces for ultrasonic sensor probes.

Abstract: A disk brake device is provided which is easier to assemble, and which prevents damage to the seal. One or more air vent grooves are molded to extend from the boot groove (5a) on piston (5), wherein in the axial direction, the length of one leg (9a) of the dust boot (9) inserted into piston (5) is shorter than the length of the air vent groove (5b), and the length from the bottom face of the cylinder cavity (2e) to the front end of the seal groove (2f) is shorter than the length from the bottom face of piston (5) to the rear end of the air vent groove (5b).

Abstract: A floating-frame spot-type disc brake is described comprising a floating frame (1) guided in a manner axially displaceable on a brake carrier (12), and being furnished with two brake cylinders (2, 3) and two brake pistons (4, 5) directly acting on two axially inwardly disposed brake shoes (6, 7). The brake carrier (12) is located entirely on one side of the brake disc and no portion extends across the outer edge of the brake disc (15), so that the maximum diameter of the brake disc is limited only by the relatively thin sections of the floating frame (1) extending across the outer edge of the brake disc. Additional brake shoes (8, 9, 22), on the axially outer side, are fixed to the floating frame (1), in turn transmitting the circumferential force acting on the outer shoes occurring during braking, through a bolt guide (10), into the brake carrier (12).

Abstract: A hydraulic brake piston (11) is formed of a clay based ceramic or conventional ceramic material, such as a kaolin based ceramic with a low thermal conductivity. The piston (11) may be incorporated in a disc brake assembly comprising a caliper body (10) provided with a cylinder which receives the piston (11). Hydraulic brake fluid is introduced under pressure into the space (12) within the body (10) to displace the piston from the body and into contact with a disc pad (14). The ceramic piston retards heat transfer from the disc pad into the brake fluid thus reducing the cause for vapor lock.

Abstract: A brake caliper has the effective modulus of elasticity of the material increased by inserting a honeycomb-like ceramic piece made of a material having a higher modulus of elasticity in a die and casting metal to fill the die, substantially encase the ceramic and substantially fill the pores of the same, and squeeze forming the molten metal to ensure substantial filling of the pores of the ceramic.

Abstract: A trailer brake system includes a disc brake assembly for each wheel including apparatus to provide release of the brake pads from engagement with the rotor upon backing. In the preferred braking system, one master brake assembly is provided for braking one wheel and a slave brake assembly for braking a second wheel of the trailer; a self-contained hydraulic actuator being provided for moving the pads into and out of engagement with the rotor. Each brake assembly includes a stationary bracket for attachment to the axle and a caliper unit with the brake pads mounted by a single pivot pin on the bracket. A relief valve is engaged by the pivoting caliper unit to provide the release of the brake pads. The housing of the caliper unit is in two sections and mounted adjacent the top of the rotor.

Abstract: A trailer brake system includes a disc brake assembly for each wheel including apparatus to provide release of the brake pads from engagement with the rotor upon backing. In the preferred braking system, one master brake assembly is provided for braking one wheel and a slave brake assembly for braking a second wheel of the trailer; a self-contained hydraulic cylinder being provided for moving the pads into and out of engagement with the rotor. Each brake assembly includes a stationary bracket for attachment to the axle and a caliper unit with the brake pads mounted by a single pivot pin on the bracket. A relief valve is engaged by the pivoting caliper unit to provide the release of the brake pads. The housing of the caliper unit is in two sections and mounted adjacent the top of the rotor.

Abstract: A support of a floating caliper (7) of a spot-type disc brake on an axially external brake shoe (4) is described. For the support, two carrier elements (5, 6) are disposed spaced apart laterally in the circumferential direction on the external brake shoe (4), the corner elements (5, 6) furnished with projections (8, 9) which engage two axially extending grooves (14, 15) on the inside of circumferential extensions on the floating caliper (7) and which come to be abutted against their internal guide surfaces (16, 17, 18, 19). The caliper is thereby of maximized width and rigidity while being securely supported on the external brake shoe.

Abstract: A low profile disk brake caliper in which a disk brake pad is mounted on a flexible diaphragm contained within a piston cavity. Pressurization of the piston cavity by a master cylinder expands the diaphragm and urges the brake pad sidewardly from the housing to engage an adjacent rotor. In the preferred embodiment, the diaphragm is received within a cap seal slidably mounted within the cavity, and the brake pad is mounted removably within a pad carrier attached to the cap. A backing seal is positioned adjacent to the underside of the top wall of the diaphragm and is clamped against the cap by assembly bolts, so that the top wall of the diaphragm is compressed between the cap and backing seal, thereby preventing the top wall from bulging outwardly when the cavity is pressurized. The housing is mounted on the hub of a bicycle front wheel and includes a set screw positioned for camming engagement against the front fork to prevent rotation of the brake caliper relative to the fork.

Abstract: A disc brake caliper comprises a cast body including an inboard support, an outboard support, a pair of spaced parallel bridge tension members and a central bridge compression member, with the one ends of the bridge members connected to the inboard support and their other ends connected to the outboard support. The outboard support includes a pair of transverse interconnected tension members with their outer ends connected to the bridge members and an inclined rib member extending from the central bridge member and connected to the junction of the pair of tension members. The caliper body further includes a cast cylindrical socket arranged inwardly of the bridge members and extending through the inboard support. A cylinder piston insert is retained within the socket. A piston is inserted within the cylinder and has a sleeve of elastomeric material bonded to its exterior cylindrical surface and is adapted to yieldably and sealingly engage the brake cylinder insert.

Abstract: A disc brake comprises a caliper housing 10 having a body member 12 and an arm member 14 connected to one another by a bridge 16. A leading side of the arm member 14, that is the side which the rotor of a disc brake reaches first during normal rotation thereof, is more rigid than a trailing side thereof. A set of stiffening fibers 28 is provided in each of first and second bridge portions 22, 24 of the bridge 16 to produce the difference in rigidities between the leading and trailing sides of the caliper housing 10, wherein the first bridge portion 22 comprises a greater density of fibers 28 than the second bridge portion 24. This difference in rigidities reduces uneven wear of the brake pad and, as a consequence, reduces brake squeal and noise.

Abstract: A single disc, single acting brake or clutch has one or more pneumatically actuated piston and cylinder assemblies for urging friction material into contact with a disc that is rotatable relative to a body which carries the piston and cylinder assembly.

Abstract: A brake caliper for a disk-type brake is disclosed having a prefabricated, cast-in-place cylinder bore liner. The liner is made of a machinable material, preferably steel, and the caliper body is made of a lightweight material, preferably aluminum. The caliper body is cast around the cylinder liner so that no further machining of the caliper bore is required. A reinforcing arm may be provided extending from the cylinder liner through the bridge portion of the caliper. A method for making the caliper is also disclosed in which the cylinder liner is positioned within a die cavity and molten metal material is cast around the liner to incorporate the liner into the caliper body.

Abstract: A disc brake for use in a vehicle, such as an automobile, includes a carrier, a rotating disc having inner and outer braking surfaces, inner and outer pads, and a caliper supported in a floating condition by the carrier. The caliper has a cylinder member housing a piston for forcing the inner pad against the inner braking surface of the disc, and a claw member having a disc-passing portion straddling the disc and a claw portion for abutting against the outer pad. The cylinder member defines a through-hole extending therethrough in the axial direction of the disc. The disc-passing portion has an inner surface facing the disc and a tapped hole. A bolt member of the caliper secures the cylinder and claw members together. The tapped portion of the tapped hole is formed such that the end of the tapped portion which is remote from the cylinder member is located on the side of the cylinder member with respect to the inner braking surface.

Abstract: A disc braking (10) for a motor vehicle comprising a rotor (12); inner and outer brake pads (14,16) disposed on opposite sides of the rotor and movable into brake engagement therewith; a caliper (18) comprising a piston (26) for urging one of the brake pads against the rotor, a caliper housing (28) having a cylinder (32) positioned on one side of the rotor within which the piston is slidably movable under the action of fluid pressure in the cylinder, and a fluid line (34) in the caliper for supplying fluid to the cylinder for movement of the piston; and a proportioning valve (44) in the fluid line and integral with the caliper for preventing fluid pressure above a predetermined level acting on the piston. Reduces risk of wheel lock on braking. Provides a unitary caliper and proportioning valve prior to installation on a motor vehicle.

Abstract: A disc brake piston is formed from a stamping operation and is preferably constructed from stainless steel. The piston includes a hollow cylindrical body having a closed end and an open end. In one preferred embodiment, the open end is provided with a radially outwardly extending flange which defines an annular abutment surface for engaging a backing plate of a disc brake shoe. An integral boot groove is formed in the cylindrical body adjacent the open end thereof, and produces a raised portion on an inner surface of the body portion directly opposite the groove. This results in the piston having a substantially uniform wall thickness throughout the entire length of the cylindrical body. Also, the piston can include a dome-shaped recess formed in the closed end thereof, which can be provided with radial strengthening ribs.

Abstract: In a disk brake actuated preferably hydraulically, a piston (5) is guided within a housing located in a caliper. When pressure is applied, the piston acts in such a manner against a brake shoe (15) bearing a brake lining (17) that the brake shoe (15) is pressed with its brake lining against the brake disk to be braked. The side of the piston facing the brake shoe has a pressure plate (13) which transmits the pressure forces and which moves transversely within its recess in the piston (5). The pressure plate (13) is mounted on the end of a tappet (25) extending axially inside the piston (5) and bracing itself at the end opposite the pressure plate by a disk (27) at the bottom (29) of the bore (31) accommodating the tappet, and is surrounded by a prestressed compression spring (37). Lateral movements of the pressure plate (13) cause tipping of the tappet (25) and, as a consequence thereof, a reset force exerted by the compression spring (37 ) on the tappet (25) and, thus, on the pressure plate (13).

Abstract: A disc brake caliper seal arrangement wherein an annular seal is provided between the caliper housing and the outside diameter of the piston provided therein. The seal provides a rollback function which returns the piston to a given running clearance between the disc rotor and brake pads after actuation of the brake. The seal is provided in a substantially square or rectangular cross-sectional configuration and is disposed in a seal groove of the caliper housing. The seal is provided with annular recesses on the ends of the parallel sides of the seal adjacent to the outside diameter of the piston. The central portion of the side of the seal which engages the outside diameter of the piston is provided with a circumferential groove. The recesses provide space of sufficient volume for the seal to deflect into before encountering the straight groove side wall, thereby eliminating the need for a machined chamfer in the housing groove.

Abstract: A telescopic brake piston includes a cylindrical housing and a pair of concentric pistons. A first hydraulic cavity is provided between an outer piston and the housing, while a second hydraulic cavity, communicating with a source requesting the application of brake force, communicates with both pistons. Passages in the outer piston allow the two cavities to communicate with each other. As the associated brake disc stack wears, the outer piston progressively extends from the housing as the passages are exposed by the inner piston. The actual brake force is attained by the inner piston alone.

Abstract: The present invention relates to a piston cap for a disc brake, comprising a brake motor consisting of a piston (24) sliding in a cylinder (26), this cap being composed of a flexible material ensuring sealing between the piston (24) and the cylinder (26) by way of a bead (32) located on its inner periphery and coming to rest in an annular groove (34) made in the head of the piston (2) and of a retention part on its outer periphery, capable of coming in contact with the inner wall of a receptacle formed at the end of the cylinder, this retention part comprising a metal insert (36) in the form of a cylindrical ring. According to the invention, the cap possesses at least one vent allowing the air contained in the volume which it delimits with the piston (24) and the cylinder (26) to escape and preventing the entry of foreign bodies or corrosive agents into this volume.

Abstract: A disc brake (10) for a motor vehicle comprising a rotor (12); inner and outer brake pads (14,16) disposed on opposite sides of the rotor and movable into braking engagement therewith; a piston (18) for urging the inner brake pad against the rotor; a support member securable to the motor vehicle; and a caliper housing (22) slidably supported on the support member, the caliper housing having a cylinder (20) positioned on one side of the rotor and containing the piston, and an arm member (26) on the other side of the rotor for urging the outer brake pad into engagment with the rotor when the piston acts on the inner brake pad, the arm member comprising a first limb (28) on the leading side of the arm member relative to a normal direction of rotation of the rotor, and a second limb (30) on the trailing side of the arm member relative to a normal direction of rotation of the rotor, each limb having a boss (32,34) protruding therefrom for engaging the outer brake pad, the boss (22) on the first limb having a small

Abstract: A multiple disc brake apparatus provided with at least one rotor rotatable with a vehicle wheel, a housing secured to an unrotatable portion of the vehicle, at least two pads supported by the housing and located on both sides of the rotors, a cylinder member secured to the housing, and a piston member mounted on the cylinder member to urge each pad against a frictional surface of the rotor responsive to a supply of a pressurized brake fluid to the cylinder. The cylinder member includes a main part fitted sealably in the cylinder member, a sub-part disposed between the main part and the pads, and a first heat-resistant member provided between the main part and the sub-part, in such a manner that the main part, the first heat-resistant member and the sub-part are arranged in series. The cylinder member is independently provided from the housing, and the cylinder member is fixedly secured to the housing through a second heat-resistant member.

Abstract: A brake actuator has a body containing a pair of brake-applying members which may be actuated hydraulically to separate the friction elements of a brake into engagement with a rotatable braking surface. The members are interconnected by a mechanism in the form of a shaft of which respective end portions are provided with reversible threaded portions of opposite hand which engage corresponding threads within the members, the shaft being constrained against axial movement between bearings. Any excess movement of one of the members relative to the other is transmitted to that other member such as to cause an opposite and proportional force on the other member to substantially equalize the wear rates on the friction elements.

Abstract: An inwardly straddling disc brake in particular for automotive vehicles is disclosed including a brake disc carried at its outer rim, a stationary brake support having two substantially radially extending arms which are interconnected by a connecting portion extending substantially in a circumferential direction and a brake housing which is axially slidably supported at the brake support member and actuable by means of an actuating means and which embraces the inner rim of the brake disc. Two radially extending legs and a substantially axially extending bridge portion connect the two legs. A first brake pad is disposed and supported on one side of the brake disc, in particular in the brake support member and to which pressure can be applied directly by the actuating means. A second brake pad is disposed and supported on the other side of the brake disc, in particular on the brake housing and which can be applied by the respective leg of the housing.

Abstract: A spot-type disc brake for automotive vehicles, including a brake carrier and a slidable housing and with an arrangement for preventing the brake housing from being lifted clear of its seat is disclosed. The retaining arrangement includes a wire element mounted on the brake housing and forming a projection which engages into or underneath an axially extending recess provided on the brake carrier.