Vehicle braking apparatus with fluid pressure operating and lock mechanism for microswitch

Claim 1

Fluid pressure operated braking apparatus comprising an actuator having a fluid pressure responsive device and a vehicle brake operating member adapted to be moved thereby in the brake applying direction, said member being adapted to move in the return direction upon release by said Device, locking mechanism adapted to be operable after movement of said member in the brake applying direction for holding said member against return movement whereby to retain said member in brake applying position, movable lock actuator means operably connected to said locking mechanism, fluid pressure responsive means operably connected to said locking mechanism, means providing a source of fluid pressure in the vehicle connected to control said fluid pressure responsive means so that said lock actuator means is normally positioned to maintain said locking mechanism inoperative to hold said member against return movement but is positioned to permit said locking mechanism to be operative to hold said member against return movement when said source pressure is below a predetermined amount, and signal means actuated in response to movement of said lock actuator means for indicating whether said locking mechanism is conditioned to prevent or permit said return movement of said member.