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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brake System & Drum Brake System - RWD Trucks >> Bleeding >> Vacuum Bleeding

Vacuum Bleeding

NOTE: Air tends to cling to caliper walls. When bleeding disc brake equipped vehicles, 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  table.
  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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