Reservoir Check Valve Replacement for GMC Truck TopKick C-Series (Conventional) C4/C5 2005

1. Block the wheels.
2. Drain all of the air reservoirs. Refer to Air Brake Reservoir Draining .
3. Remove the air line from the single check valve. Refer to Hose and Line Replacement - Nylon and Metal Compression .



4. Remove the single check valve.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

1. Install the single check valve.

Tighten
Tighten the single check valve to 50 N·m (37 lb ft).

2. Install the air line to the single check valve. Refer to Hose and Line Replacement - Nylon and Metal Compression .
3. Perform the air leakage test. Refer to Reservoir Check Valve Operational Check .
4. Perform the operational test. Refer to Reservoir Check Valve Leakage Test .
5. Remove the wheel blocks.