For 1990-2009 cars

### Removal Procedure

1. Block the wheels.
2. Drain all of the air reservoirs. Refer to Draining Reservoirs in Air brakes.
3. Remove the upper inner fender panel. Refer to Wheelhouse Panel Replacement in Body Front End.
4. Remove the air lines from the double check valve. Refer to Hose and Line Replacement - Nylon and Metal Compression
5. Remove the double check valve from the dual application valve.
6. Inspect the air lines for the following conditions:

• | Damage

• | Kinked

• | Worn

7. Repair or replace any damaged, kinked, or worn air lines.

### Installation Procedure

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 double check valve to the dual application valve.

Tighten
Tighten the double check valve to 28 N·m (21 lb ft).

2. Install the air lines to the double check valve. Refer to Hose and Line Replacement - Nylon and Metal Compression
3. Perform the air leakage test. Refer to Air Brake Double Check Valve Operational Check .
4. Perform the operational test. Refer to Air Brake Double Check Valve Leakage Test .
5. Install the upper inner fender panel. Refer to Wheelhouse Panel Replacement in Body Front End.
6. Remove the wheel blocks.