Abstract: A disc brake having spaced apart first cantilever beams that extend from an anchor and second cantilever beams that extend from the first beams back toward the anchor. A caliper is retained on the anchor by a pin to align first and second friction members with a rotor. Pressurized fluid that acts on a piston moves the first friction member into engagement with the rotor creates an axial force that axially slides the caliper on the pin and moves the second friction member into engagement with the rotor to create a clamping force that urges the friction members into engagement with the rotor. The clamping force rotates the caliper on the pin and brings the first friction member into engagement with the first cantilever beam and the second friction member into engagement with the third cantilever beam to oppose the rotation of the caliper during a brake application.

Abstract: A brake booster includes a housing, a retention cuff, and a spring. The housing defines a passage to an interior chamber. The retention cuff is positioned in the interior chamber about the passage. The spring engages the retention cuff in the interior chamber. The master cylinder arrangement includes a tube member and a brake fluid reservoir. The tube member includes a first end and a second end. The tube member extends through the passage and the retention cuff such that the first end of the tube member is exposed to the interior chamber of the brake booster. The brake fluid reservoir is in fluid communication with the tube member.

Abstract: A brake booster wherein second and third pistons are separated within a bore of a master cylinder to define second and third chambers. Compensation valves control the flow fluid from a reservoir to the bore while a passage in the second piston connects the second chamber with the third chamber that is connected to the reservoir through an tilt valve that is held opened by pressurized fluid acting on a fourth piston. A control valve responds to a resiliently applied force from an input rod carried by the third piston to supply pressurized fluid to the brake system. In an event pressurized fluid is unavailable, a spring moves the fourth piston and a sixth spring to moves the tilt valve against a seat to seal the third chamber and create a hydraulic lock. Further movement of the third piston correspondingly moves the second piston to effect a manual brake application.

Abstract: A brake booster includes a housing, a retention cuff, and a spring. The housing defines a passage to an interior chamber. The retention cuff is positioned in the interior chamber about the passage. The spring engages the retention cuff in the interior chamber. The master cylinder arrangement includes a tube member and a brake fluid reservoir. The tube member includes a first end and a second end. The tube member extends through the passage and the retention cuff such that the first end of the tube member is exposed to the interior chamber of the brake booster. The brake fluid reservoir is in fluid communication with the tube member.

Abstract: A master cylinder having a housing with a bore wherein front and rear pistons are located by return springs to define front and rear chambers. The front and rear chambers are respectively connected by an axial port and a radial port in the housing to a reservoir. Communication of fluid between the bore and reservoir is controlled by a rear center compensation valve that is linked to a front center port compensation valve such that fluid communication between the front and rear chambers and reservoir is controlled by movement of the rear piston in response to an input force with a first and second actuation springs respectively closing the front and rear center port compensation valves to allow simultaneous pressurization of fluid in the front chamber and rear chamber that is supplied to front wheel brakes and rear wheel brakes to effect a brake application.

Abstract: A retraction arrangement for moving a piston in a bore of a caliper to a position of rest after each brake application. The retraction arrangement includes a cylindrical body with a plurality of inward projecting fingers that engage and apply a radial spring force on the piston. Each finger is defined by a cylindrical section that transitions into a first arcuate section that transitions into a radial section that transition into a second arcuate section that engages the piston. The second arcuate section moves with the piston during a brake application causing the fingers to pivots with respect to the cylindrical body resulting in a decrease in the radial spring force while creating an increasing axial spring force in each finger. On termination of the brake application, the axial spring force returns the piston to the position of rest to establish a running clearance between a friction member and the rotor.

Abstract: A hydraulic brake booster has a housing with a stepped bore for retaining a cylindrical piston and a control bore for retaining a control valve. The cylindrical piston defines, with the stepped bore, an output chamber, a relief chamber and a power chamber; and includes a second stepped bore for a reaction piston. The reaction piston includes an axial bore, receiving a plunger defining an actuation chamber and a poppet valve. The input force initially moves the plunger and poppet valve to interrupt communication between the actuation and relief chambers; and thereafter moves the plunger to pressurize fluid in the actuation chamber, creating an input signal. The input signal activates the control valve; generating a regulated pressurized fluid, supplied directly to a second set of wheel brakes and acts on the cylindrical piston, to pressurize operational fluid supplied to a first set of wheel brakes.

Abstract: A master cylinder (12,212) including a housing (40,40a) with a bore (42,42a) for retaining a piston assembly (100,200) to define a first chamber (54) that is connected to wheel brakes (14,14′) in a first brake circuit and a second chamber (56) that is connected to wheel brakes (18,18′) in a second brake circuit. The piston assembly (100,200) includes a sleeve (102,202) and a concentric cylindrical body (110,210) whose respective first and second end surface areas define a first effective area (D1) while the second end surface area of the cylindrical body (110,210) defines a second effective area (D2) within the bore (42,42a).

Abstract: A hydraulic brake booster (12) having a housing (100,200) with a first bore (102) separated from a second bore (104). The first bore (102) retains a power piston (50) and the second bore (104) retains a control valve (60). The first bore (102) is connected by a passage (112) to the second bore (104) that is connected to a source of pressurized supply fluid (24). In responsive to a desired braking force being applied to the input member (30,30′), the lever arrangement (80) moves the control valve (60) to allow controlled pressurized supply fluid to be communicated from the second bore (104) by way of passage (12) to the first bore (102).

Abstract: A hydraulic brake booster (12) having a housing (100,200) with a first bore (102) separated from a second bore (104). The first bore (102) retains a power piston (50) and the second bore (104) retains a control valve (60). An input member (30,30′) is connected to the power piston (50) and linked to the control valve (60) by a lever arrangement (80). The first bore (102) is connected by a passage (112) to the second bore (104) that is connected to a source of pressurized supply fluid (24). In responsive to a desired braking force being applied to the input member (30,30′), the lever arrangement (80) moves the control valve (60) to allow controlled pressurized supply fluid to be communicated from the second bore (104) by way of passage (12) to the first bore (102). The controlled pressurized supply fluid in the first bore (102) acts on the power piston (50) to develop an operational force to effect a brake application.

Abstract: A brake system (10) having a brake booster (12) that is responsive to an operator brake input for providing a first input force to a master cylinder (13) to develop a first brake application and is responsive to a hydraulic input for providing a second input force to a master cylinder (13) to develop a second brake application. An electronic control unit (ECU) (40) receives first input signals from sensors (19) indicative of a speed for each wheel (14,14′,18,18′) in a brake system of the vehicle. The ECU (40) supplies a pump (42) with an operational input signal when a sensed wheel speed indicates a wheel lock may occur between a wheel and a surface during a brake application and simultaneous activates a decay valve (17) to release pressurized fluid from actuation of the wheel brake associated with the wheel.

Abstract: A control apparatus (12) for a brake system (10) having a housing (40) with a first (42) and second (46) cylindrical members located in first (44) and second (46) bores. The first (42) and second (46) cylindrical members and corresponding first (50) and second (54) valve seat members define first (52) and second (56) chambers within the first (44) and second (46) bores which are connected to a source of pressurized fluid. First valve means (68) are located in the first chamber (52) and second valve means (70) are located in the second chamber (56). A first plunger means (72) in the first bore (40) and a first valve seat member (50) define a first brake chamber (74) which is connected to a first set (16) of wheel brakes and a second plunger means (76) in the second bore (48) and a second valve seat member (54) define a second brake chamber (78) in the second bore (46) which is connected to a second set (16′) of wheel brakes in the vehicle.

Abstract: A control apparatus for a brake system having a housing with a first bore for retaining a spool valve and a second bore for retaining a selector valve. A cap separates the first bore into a first chamber and a second chamber. The first chamber has an inlet port connected to a source of fluid under pressure, a gear port for connected the source of fluid under pressure to a hydraulically operated device, a relief port connected to a reservoir and an outlet passage connected to a selector valve which communicates pressurized fluid through an outlet port to a brake booster. The second chamber is connected to the reservoir and the second bore. The a spool valve has a peripheral surface with first and second grooves separated by lands and an internal operational passage connecting the second groove to the outlet passage.

Abstract: A back-up power assisted braking system substitutes an intermittently actuated secondary source of pressurized hydraulic fluid such as a traction control/anti-lock pump and motor (41) for the normal braking power assist upon the detection of a failure in the primary power assisted braking system. A failure may be detected in responsive to sensing simultaneous brake pedal (23) displacement and a lack of fluid flow for providing an abnormality signal. Also, a failure may be detected by sensing a predetermined difference between the commanded braking force (45) and the actual braking forces (38, 49). There is a pressure transducer (45) which provides an indication of brake pedal commanded braking force and a hydraulic circuit (43, 53 or 55, 51) interconnecting the secondary source outlet, the individual wheel brake actuators (14) and secondary source inlet.

Abstract: A hydraulic brake booster comprises a housing forming a pressure chamber and a pair of bores leading to the pressure chamber. One of the bores receives an output piston and the other bore receives a valve member. The valve member is movable by an input actuator to control communication of fluid pressure to the pressure chamber. The end of the valve member within the pressure chamber carries a sleeve and a poppet. The sleeve resiliently imparts movement to the valve member and the poppet cooperates with the sleeve to close communication to the pressure chamber in response to movement of the sleeve relative to the valve member.

Abstract: A warning circuit generates warning signals in response to conditions of a vehicle brake system which includes main and back-up brake fluid pumps. The main pump is engine-driven and ignition-switch controlled. The back-up pump is relay actuated and battery powered. A sensor switch opens upon operation of the main pump and a brake switch closes during an operator brake application. The warning circuit includes a first OR gate with inputs coupled to the ignition and brake switches. The output of the first OR gate is coupled to the relay and to a first warning lamp. The output of the first OR gate is capacitively coupled to the set input of a set-reset flip-flop and is coupled to the reset input of the flip-flop. The reset input is also coupled to a terminal of the back-up source. The Q output of the flip-flop is coupled to an input of a second OR gate through an inverter.