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Home >> Buick >> 1976 >> Skyhawk Base, Automatic Trans >> Repair and Diagnosis >> Suspension >> Suspension Control Systems >> Automatic Level Control >> Testing (Off Car) >> Leak Testing >> Compressor, Reservoir, Regulator
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Compressor, Reservoir, Regulator

  1. With assembly removed from vehicle, but not disassembled, connect test gauge to regulator and inflate reservoir to 80-110 psi. Route a 8" rubber hose between vacuum and vent ports.
  2. Place assembly vertically in a tub of water until diaphragm is just submerged.
    CAUTION: Do not submerge assembly completely or water will enter around cover gasket.

    Check for air leaks. Remove hose from vacuum port and put disconnected end in water. Cover vacuum port with finger. If bubbles are present, second stage housing check valve is probably faulty.

  3. If compressor passes leak test but fails output test, overhaul compressor.
    NOTE: If cover gasket is accidentally submerged in water, remove cover and tilt unit so water will drain through openings at distributor valve. Move distributor valve sideways until all water is expelled. Blow dry with air and replace cover.
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