Vehicle electrical parking brake test procedure compares brake pressure rise gradient during second application to reference value to check lock strength

摘要

A vehicle electrical parking brake test procedure uses a brake pressure sensor (15) to record the pressure gradient applied by the hydraulic unit (6) in a renewed increase after initial locking and compares it to a reference value to determine the lock strength and actuate a driver warning (16). Independent claims are included for vehicle parking brakes using the procedure.