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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) >> Adjustments >> Parking Brake - Leading/Trailing Brakes

Parking Brake - Leading/Trailing Brakes

  1. Raise and support rear of vehicle. Remove rear wheels. Remove brake drums. Rotate parking brake adjusting screw until clearance between brake drum and shoes is .010-.020" (.25-.51 mm). Use brake drum diameter gauge to determine clearance.
  2. Ensure stop on parking brake lever is in contact with edge of brake shoe web. If parking brake cable is holding stops off of shoe web, loosen cable adjusting nut. Tighten cable adjusting nut until lever stop begins to move off of shoe web.
  3. Loosen cable adjusting nut until lever stop moves back toward lever stop and barely contacts the stop. Clearance should be no more than .020" (.51 mm) between lever stop and shoe web.
  4. Install brake drums and wheels. Apply and release service brake pedal 30-35 times with normal pedal force, pausing about one second between pedal applications. Apply parking brake pedal 6 notches from fully released position.
  5. Rear wheels should not be able to be rotated. Release parking brake and ensure wheels rotate freely. Lower vehicle.
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