A spring brake actuator (100) having a push rod plate (134) and a diaphragm (130) is provided. A rim (152) projects from the diaphragm (130) for engaging a housing (118) containing the push rod plate (134). A sidewall (230) is connected to the rim (152), w...

In a negative pressure booster of the present invention, a threshold line for starting a BA operation at a pedal step-in speed equal to or more than a predetermined speed is set, an inclination of the threshold line is set to a value equal to a servo ratio...

The actuator has a piston (22) with a tubular bush (64) mounted around a plunger (56) forming front side of the piston. The piston has a piezoelectric actuator for increasing an initial length (L1) of the bush to a greater length. The length (L1) is increa...

The servomotor has a sealing diaphragm (30) made of an elastomer material and whose periphery is fixed to a casing. A peripheral skirt (28) is provided, in the vicinity of its periphery, with a stamped annular recess (42) defining an internal groove that s...

The servomotor comprises an axial piston (20) interposed between a push rod (24) and a plunger (32) at the end of a control rod (22). A sensor (42) is mounted to slide on the plunger (32). There is tipping key immobilizer (62) axially locking the sensor re...

The servomotor incorporates an emergency braking assembly comprising a tilting key (58) that interacts with a bush surrounding a central feeler (22) to lock the bush in the forward position during emergency braking. The key is equipped with a damper (69) t...

The pneumatic servomotor has a housing (101) made from a bowl (105) with a rim (153) and a cover (103), with its inner volume (107) divided into a variable pressure working chamber (109) and a low pressure chamber (111) by an inner sliding and sealed skirt...

Diaphragm support (18) comprises a central zone (40) fixed on an amplifier piston (14) and a peripherical zone (41). The part extending from the central part has two layered sheets (42,44). The diaphragm separates two chambers (20,24). When the braking ped...