Brake Proportioning/Combination Valve: Application and ID

^ The ABS-only brake master cylinder uses a brake pressure control valve in the primary (rear) circuit to control hydraulic pressure to the rear brakes. The secondary circuit (front) supplies the front brakes. The brake pressure control valve is serviced separately.
^ The ABS-traction Control brake master cylinder does not use a brake pressure control valve. The primary (rear) circuit supplies the front brakes. The secondary circuit supplies the rear brakes.