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Towing Vehicle Brake Subsystem Circuit Diagram
 
Towing Vehicle Brake Subsystem Circuit Diagram
Diagram 12-3: Towing Vehicle Brake Subsystem Circuit Diagram
  1. Service brake chambers
  2. Front wheel-limiting valve
  3. Brake pedal
  4. Spring brake control valve
  5. Spring brake chambers
  6. Hand valve
  7. Trailer supply valve
  8. Tractor protection valve

Note: This is only a sample circuit diagram. Components and their positions may be different on your vehicle.