Accumulator LEAKDOWN Test
- Start engine, and charge accumulator by either applying brake with heavy pedal force or turning steering wheel lock-to-lock.
- Turn off engine and wait 1 hour. There should be 1 power-assisted brake application with engine off.
- If reserve system will not retain a charge for 1 hour, but functions normally immediately following charging; or if accumulator can be heard charging and discharging but will not hold a charge, accumulator valves are at fault. Power piston/accumulator must be replaced.
NOTE:
If Hydro-Boost is not functioning, ensure power steering system is operating before replacing Hydro-Boost unit.