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Home >> GMC >> 1993 >> C3500 HD 5.7 K, Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc & Drum Brake System >> Bleeding Brake System >> Vacuum Bleeding

Vacuum Bleeding

NOTE: Air tends to cling to caliper walls. When bleeding vehicles with disc brakes, lightly tap caliper to help remove air.
  1. Fill master cylinder reservoir. Install vacuum bleed equipment to first bleeder valve to be serviced. See BLEEDING SEQUENCE  under BLEEDING BRAKE SYSTEM.
  2. Open bleeder valve 3/4 - 1 turn. Press vacuum pump to draw fluid into reservoir jar until no air bubbles are present in fluid flow. Close bleeder screw. Repeat procedure on remaining wheels in sequence.
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