Brake Proportioning/Combination Valve: Description and Operation

Hydraulic System Layout (With ABS):

A Pressure Reducing Valve (PRV), fitted to the RH bulkhead in the engine compartment, maintains the braking balance. Pressure to the rear calipers is regulated by the PRV; this valve is of the failure bypass type allowing full system pressure to the rear brake calipers in the event of a front (secondary) circuit failure.