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Home >> Chevrolet >> 1990 >> Step Van 7.4 N, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Disc Brake System & Drum Brake System) >> Bleeding Brake System >> Master Cylinder Bleeding

Master Cylinder Bleeding

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NOTE: To prevent air from entering brake system, bench bleed master cylinder before installing.
  1. Place master cylinder in soft-jawed vise. DO NOT overtighten vise. Install bleeder tubes in both outlets of master cylinder. See Fig 1. Fill master cylinder reservoir. Ensure ends of bleeder tubes are submerged in brake fluid.
  2. Using screwdriver or drift punch at end of master cylinder bore, press and release piston assembly until air bubbles are no longer present in fluid flow. Leave bleeder tubes installed on master cylinder. Install master cylinder.
  3. Remove bleeder tubes. Connect brake lines at master cylinder. DO NOT fully tighten brake lines at this time. Slowly press brake pedal to floor and hold. Tighten brake lines. Release brake pedal. Bleed brake system. See MANUAL BLEEDING , PRESSURE BLEEDING  or VACUUM BLEEDING .
Fig 1: Bench Bleeding Master Cylinder
G117379Courtesy of GENERAL MOTORS CORP.
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