Brake Proportioning/Combination Valve: Description and Operation

- The brake system has a brake pressure control valve (2B091) that regulates hydraulic pressure in the rear brake circuit.
- On disc/drum systems, the brake pressure control valve is located on the brake master cylinder. On 4-wheel disc systems, the brake pressure control valve is located on the bulkhead.
- When the brake pedal is applied, full rear circuit pressure passes through the brake pressure control valve until the split point of the brake pressure control valve is reached. Above the split point, the brake pressure control valve begins to reduce hydraulic pressure to the rear brake circuit. This creates a balanced braking condition between the front and rear wheel while maintaining balanced hydraulic pressure at each wheel.