To be sure the accumulator is performing properly, rotate the steering wheel with the engine running until it stops and hold it in that position for no more than 5 seconds. Return the steering wheel to the center position and shut off the engine. Pump the brake pedal. You should feel two to three power-assisted strokes. Now repeat the steps. That pressurizes the accumulator. Wait one hour then pump the brake pedal. There should be two or three power-assisted strokes. if the system does not perform as just described, the accumulator is leaking and should be replaced.