Park Brake Solenoid Valve Replacement Gen.

1. Block the vehicle's wheels.
2. Drain all the air reservoirs.
3. Disconnect the air lines from the valve. Tag or label the air lines for later installation.
4. Remove the pressure sensor. Refer to Parking Brake Pressure Sensor.



5. Remove the pin.
6. Remove the knob.



7. Remove the nut.
8. Remove the valve.
9. Inspect the air lines for damage or deterioration. Repair as needed.
10. Inspect for cracked, loose, or missing line clips or ties. Repair as needed.

1. Install the valve.
2. Install the nut.



3. Install the knob.
4. Install the pin.



5. Install the air lines in the following order:

5.1.	Delivery port air line

5.2.	Supply port air line

5.3.	Exhaust port air line

6. Install the pressure sensor. Refer to Parking Brake Pressure Sensor.
7. Perform Leakage Test. Refer to Park Brake Valve .
8. Perform Operational Check. Refer to Park Brake Valve .
9. Check the operation of the brakes.
10. Remove the wheel blocks.

Park Brake Solenoid Valve Replacement Air Parking Brake

1. Remove the bolts (8) and the washers (9).
2. Remove the cover (7) and the O-ring seal (6).
3. Remove the nut (10).
4. Remove the washer (11).
5. Remove the valve (5).
6. Remove the plunger (1).
7. Remove the O-ring seal (2)
8. Remove the spring (3).
9. Remove the mounting nut (12).
10. Clean all the metal parts in mineral spirits or another suitable solvent.
11. Inspect the plunger and the valve bore for scoring and burrs. Replace if necessary.

1. Lubricate the valve bores, the plunger, the valve and the O-ring seal with a thin film of Delco Silicone Lube (GM P/N 18010909) or the equivalent.

Use only new seals from the repair kit.

2. Install the O-ring seal (2) on the plunger (1).
3. Install the spring (3) and the plunger in the body (4).
4. Install the mounting nut (12).
5. Install the valve (5).
6. Install the washer (11).
7. Install the nut (10).
8. Install the O-ring seal (6) and the cover (7).
9. Install the washers (9) and the bolts (8).