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Home >> Chevrolet >> 1994 >> C3500 HD 7.4 N, Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> BENDIX - Hydro-Boost Power Brake Booster >> Testing >> Accumulator Leak-Down Test

Accumulator Leak-Down Test

  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. See OVERHAUL .
  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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