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Accumulator Leak-Down Test

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Sierra, 1999 GMC Savana Special, and 1999 GMC Savana Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine. Charge accumulator by applying brakes or turning steering wheel from stop-to-stop. Turn engine off. Allow vehicle to sit for one hour. Apply and release brake pedal. There should be at least 2 power-assisted applications. This indicates the accumulator is retaining a charge.
  2. If accumulator does not retain charge for one hour but functions normally immediately after charging, replace accumulator valve. See OVERHAUL . If accumulator can be heard charging and discharging but does not hold a charge, replace accumulator valve.
  3. Discharge accumulator by pressing brake pedal several times. Attempt to rotate accumulator can in respect to housing. If it is possible to rotate can, accumulator has lost its gas charge. Replace accumulator assembly.
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