Brake control to ensure automatic service brake effort does not exceed parking brake effort

摘要

A brake control system for a motor vehicle 10 having wheels 12, service brakes 11a & 11b for supplying a service braking effort to a plurality of the wheels12, sensing means 16 for detecting standstill of the vehicle, and a parking brake 30 engageable to supply a park braking effort to a subset 11b of the plurality of wheels 12. The system comprises brake actuation means for actuating the service brakes 11a & 11b to supply the service braking effort; and brake control means for controlling the brake actuation means to supply an automatic component of the service braking effort. The brake control means is arranged, when standstill of the vehicle is detected and before the parking brake is engaged, to cause the brake actuation means to supply the automatic component of the service braking effort only to the subset 11b of the plurality of wheels 12. Alternatively, the brake control system ensures automatic service brake effort does not exceed parking brake effort.