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Home >> GMC >> 1990 >> Forward Control 7.4 N, Automatic, 400/M40 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> DISC & DRUM (C, G, K, P, R & V Series) >> Overhaul >> Brake Booster - DELCO-Moraine Single Diaphragm >> Cleaning & Inspection

Cleaning & Inspection

  1. Clean all metal, plastic, and rubber parts in denatured alcohol. Blow out all passages, orifices, and valve holes with clean, dry air. Air dry all parts.
  2. Slight rust on inside of housings can be polished with crocus or emery cloth. There should not be any nicks or cuts on rubber part. Replace any damaged part.