Vehicle braking apparatus.

摘要

A vehicle braking apparatus (10) having a service braking section (12) and a wheel lock control (ABS) section (14). Under certain conditions the wheel lock control section may not be able to generate sufficient pressure to operate the vehicle wheel brakes (30) when the master cylinder (20) output pressure has been isolated from the wheel brake. When such conditions occur, the displacement piston (106) of the ABS section moves to open a check valve (122) which connects master cylinder output pressure to the vehicle wheel brake even though the ABS section has isolated it from the wheel brake. The opening of the check valve effectively returns the vehicle braking apparatus to service braking until the vehicle operator releases the vehicle braking apparatus.