Express 1 Ton Van V8-5.7L VIN R (1999)
Hydraulic Brake Booster: Component Tests and General Diagnostics
1. Start the engine.
2. Charge the accumulator by pressing the brake pedal or by completely turning the steering wheel in one direction and then in the other.
3. Turn the engine off. Let the vehicle sit for an hour.
4. Perform two power assisted applications with the engine off.
5. If the accumulator failed to hold a charge after one hour, but functions normally after charging, the accumulator valves are malfunctioning.
6. Replace the accumulator.
