Removal Procedure
- Block the wheels.
- Drain all of the air reservoirs. Refer to Draining Reservoirs .
- Remove the air lines from the park control valve. Refer to the following procedures:
- Remove the pins.
- Remove the knobs.
- Remove the parking control valve nuts.
- Remove the parking control valve.
- Inspect the air lines for the following conditions:
- Repair or replace any damaged, kinked, or worn air lines.
Important: Tag and label the air lines for the installation procedure.
| • | Damage |
| • | Kinks |
| • | Wear |
Installation Procedure
- Install the parking control valve.
- Install the parking control valve nuts.
- Install the knobs.
- Install the pins.
- Install the air lines to the parking control valve. Refer to the following procedures:
- Perform the air leakage test. Refer to Trailer Brake Control Valve Leakage Test .
- Perform the operational test. Refer to Trailer Brake Control Valve Operational Check .
- Remove the wheel blocks.
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.
Tighten
Tighten the parking control valve nut to 6 N·m (53 lb in).
