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

System Bleeding

  1. Place transmission in Park to set control valve in Park mode. Start engine. Turn steering wheel from stop to stop to bleed power steering system. Place transmission in Neutral.
  2. Open bleed screw on actuator until fluid flow is free of air, then close bleed screw (bleed screw is near fluid hose connection, on top of actuator). Loosen exhaust line fitting (port EC) at control valve. See Figure. Place transmission in Park. Allow small amount of fluid to bleed from fitting, then tighten fitting.
  3. Cycle the system. If noisy, repeat bleeding procedure. Check power steering fluid level with transmission in Neutral and parking brake applied manually. Fluid level should be 7.12" (180.9 mm) from top of reservoir.
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