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Home >> Pontiac >> 2001 >> Aztek Base, FWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes & Drum Brakes >> Bleeding Brake System >> Pressure Bleeding

Pressure Bleeding

NOTE: Air tends to cling to caliper walls. When bleeding vehicles with disc brakes, lightly tap caliper to help remove air.
WARNING: Do not use rigid clamp to position hold-off valve stem. This may damage valve assembly, causing brake failure.
  1. Clean master cylinder cap and surrounding area. Remove cap. Install Brake Pressure Bleeder Adapter (J-35589-A) onto master cylinder reservoir. With pressure tank at least 2/3 full, connect pressure bleeder to master cylinder with adapters. Attach bleeder hose to right rear bleeder valve.
    NOTE: On vehicles with 4WAL, if brake pressure modulator valve was replaced, or is suspected to have air trapped inside, it must be bled next. See appropriate ANTI-LOCK article.
  2. Place other end of hose in glass jar partially filled with brake fluid so end of hose is submerged in fluid. Open release valve on pressure bleeder. Set pressure bleeder to 25-30 psi (1.75-2.11 kg/cm2 ) or pressure specified by equipment manufacturer.
  3. Open bleeder screw 3/4 - 1 turn and note fluid flow. Close bleeder screw when no air bubbles are present in fluid flow. Repeat procedure on left rear, right front, and left front wheels in this order.
  4. Check brake pedal operation. Remove pressure bleeder. Remove valve retainer from hold-off valve. Refill master cylinder reservoir, if necessary.
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