Abstract: In order to address a problem with the effectiveness of a brake booster device, provision is made for the latter to be produced in the form of hydraulic servo control. In such an instance, a master cylinder (7-10) of a braking circuit (3-4) is provided with a pressure chamber (19) upstream of the braking circuit. This pressure chamber is then subjected to an injection (28) of hydraulic fluid by a pump (34). The pump is operated (39) according to the braking requirements. The servo control comprises a set of moving gear (54) sensitive to these requirements and that work an injection valve (29-30).

Abstract: A method of detecting the braking of a vehicle comprising a push rod (200) intended to transmit an amplified braking command to a master cylinder. A plunger (220), arranged parallel to the primary piston (200) so as to reproduce the movements of this piston, and a sensor (230) which senses the movements of the plunger (220), this sensor (230) being fastened to the booster (250), are used to detect a braking operation by detecting a movement of the plunger (220).

Abstract: In order to address a problem with the effectiveness of a brake booster device, provision is made for the latter to be produced in the form of hydraulic servo control. In such an instance, a master cylinder (7-10) of a braking circuit (3-4) is provided with a pressure chamber (19) upstream of the braking circuit. This pressure chamber is then subjected to an injection (28) of hydraulic fluid by a pump (34). The pump is operated (39) according to the braking requirements. The servo control comprises a set of moving gear (54) sensitive to these requirements and that work an injection valve (29-30).

Abstract: A method of detecting the braking of a vehicle comprising a push rod (200) intended to transmit an amplified braking command to a master cylinder. A plunger (220), arranged parallel to the primary piston (200) so as to reproduce the movements of this piston, and a sensor (230) which senses the movements of the plunger (220), this sensor (230) being fastened to the booster (250), are used to detect a braking operation by detecting a movement of the plunger (220).

Abstract: A pneumatic booster operated by a plunger (9) housed in a bore (61) and bearing on a moving seat (102) which co-operates selectively with a shut-off member (111). The shut-off member (111) is capable of selective co-operating with a stationary seat (101). The plunger (9) being characterized by a cylindrical body (91) and a ring (92). The ring (92) sliding between a front stop (911) and a rear stop (912) on the cylindrical body (91). A front section of the ring (92) being located between the cylindrical body (91) and the bore (61) while a rear section (922) is designed to bear against the moving seat (102). The ring (92) being temporarily retained in a stationary position in the bore (61) independent of any movement of the cylindrical body (91) through the action of a pivoting key (13) and an elastic snap ring (141) to allow permit and extended actuation of the booster after a sharp braking action has occurred.

Abstract: A method and structure for connecting a pneumatic booster (S) to a brake pedal (F) by nesting a second element (3) inside a second element (2) of a control rod (1). The second element (3) is held one inside the first element (2) by a spring clip (25) that is housed in a circular groove (26) of an adapter (5) to define an elastic attachment and allow for play to be taken up to stabilize the connection.

Abstract: In order to connect a pneumatic booster (S) to a brake pedal (F), it is necessary to fix a control rod (1) of the booster (S) to the brake pedal (F). This fixing is made difficult because of the location of the booster which is located in the engine compartment and because of the location of the brake pedal (F) which is located in the cabin of a vehicle. In order to make it easier to fix the booster (S) to the brake pedal (F), a method for the rigid and blind fixing of the brake pedal (F) to the control rod (1) of the booster is provided. This result is obtained by nesting two nesting portions (2, 3) of a control rod (1) which are connected respectively to the booster and to the brake pedal. The two portions are held one inside the other using a spring clip (25) housed in a circular groove (26). This elastic attachment device also allows play to be taken up and allows the mounting to be stabilized.

Abstract: A fuse device for a pneumatic brake booster, characterized by a hollow cylindrical first part (21) with a first end (25) having an inside diameter (d1) and a bowl-shaped second part (24) with a circular bottom equipped on its central external part with a roughly cylindrical stud (29) of an outside diameter (d2) slightly greater, within the tolerances, than the inside diameter (d1) of the end of the hollow cylindrical first part (21). The outside diameter (d2), allowing the hollow cylindrical first part (21) to be secured to the bowl-shaped second part (24) by forcibly inserting the stud (29) into hollow end (25) of smaller diameter (d1). The bowl-shaped second part (24) having a circular external groove (30) whose purpose is to weaken the connection between the stud (29) and the bottom (26) of the bowl-shaped second part (24) when a pair of forces is applied to the fuse device to allow the hollow cylindrical first part to detach from the bowl-shaped second part.

Abstract: The present invention relates mainly to a fuse device for a pneumatic brake booster, characterized in that it comprises a hollow cylindrical first part (21) one end (25) of which has an inside diameter (d1) and a bowl-shaped second part (24) with a circular bottom equipped on its central external part with a roughly cylindrical stud (29) of an outside diameter (d2) slightly greater, within the tolerances, than the inside diameter (d1) of said end of said hollow cylindrical first part (21), so as to allow said hollow cylindrical first part (21) to be secured to said bowl-shaped second part (24) by forcibly inserting said stud (29) in said hollow end (25) of smaller diameter (d1), said bowl-shaped second part (24) having a circular external groove (30) whose purpose is to weaken the connection between said stud (29) and said bottom (26) of said bowl-shaped second part (24) when a pair of forces is applied to said fuse device, so as to allow said hollow cylindrical first part to detach from said bowl-shaped seco

Abstract: A brake device having a pneumatic brake booster and a master cylinder. The master cylinder operates in response to a combined actuation force derived from a boost force and an input force. The input force is applied to a control rod for opening a valve to develop a pressure differential across a partition. The pressure differential acts on the partition to develop the boost force which is transmitted through a first hydraulic piston retained in the master cylinder. A movable pneumatic piston which carries the control rod is connected to the hydraulic piston and after an initial travel during which the valve is opened acts directly on the hydraulic piston to provide a portion of said actuation force. The input of the pneumatic piston to the hydraulic piston provides a way to operate a master cylinder in response to an input force in the event of a failure of a hydraulic circuit connected to the master cylinder.

Abstract: A pressure-holding valve for a brake system having a body with a blind bore therein. The body has a first passage which connects the blind bore with a variable pressure inlet port and a pressure outlet port. The blind bore is closed by seals carried on a plug having an axial passage therein connecting said inlet port with a second passage connected to the first passage. A non-return valve is located in said blind bore between the plug and the bottom of the blind bore while a valve controlled by an electromagnet is locate in the plug. In response to an operational signal the valve controlled by the electromagnet is moved into engagement with a seat to interrupt communication between the inlet port and the first passage.