Pneumatic servo-assisted braking system for automotive vehicle, has a reliable system which locks the plunger to the reaction disc in case of emergency braking to achieve maximum braking potential

摘要

The unidirectional clutch (56) has a transversal face (76) for locking the pin, which is turned axially towards the rear for forming a stop for a lug (78) of the key which extends radially towards the pin, in order to axially index the extreme locking position of the pin. A pin (58) slides coaxially on a plunger (46), with a key (60) annularly surrounding it. When a urgent braking force is applied to the control rod (38) which is fixed to the plunger, this causes the pin to lock with the piston (22) independently of the control rod.