Power Steering System Filtering

Power Steering System Filtering





NOTE: The intent of this procedure is to remove contamination in the power steering system that has resulted in a brake pedal kickback condition. This is accomplished by installing a temporary filter (7B155) in-line with the power steering system. The filter should be installed in-line between the steering gear and the fluid cooler or in-line between the fluid cooler and the fluid reservoir. If the brake pedal kickback condition still exists after carrying out the filtering procedure, a new Hydro-Boost(R) brake booster must be installed.

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Jacking and Lifting Service and Repair.

2. Using a suitable tool, pinch-off the return hose to prevent fluid loss when the hose is disconnected.

3. Release the clamp and disconnect the return hose from the the fluid cooler.
- Cap the fluid cooler port to minimize fluid loss.

- Install the temporary filter in-line with the return hose using the original hose clamp to retain the filter.

4. Using a section of 3/8 in hose (approximately 101.6 mm [4 in] long) and clamps, attach the other end of the filter to the fluid cooler.

5. Remove the hose pinch-off tool from the return hose.

6. Check the power steering fluid level and add fluid as necessary.

7. Start the engine and allow it to run at idle for approximately 15 seconds.

8. NOTICE: Do not hold the steering wheel at the stops for an extended amount of time. Damage to the power steering pump may occur.

Turn the steering wheel lock-to-lock 10 times.

9. Fully apply the brake pedal (hard to the floor) 25 times.

10. Turn the steering wheel lock-to-lock 5 times.

11. Remove and discard the filter.
- Connect the return hose to the fluid cooler.

12. Fill the power steering system. Refer to Power Steering System Filling Power Steering System Filling.

13. Start the engine and with the engine at idle, gradually apply the brake pedal until fully applied. If the brake pedal kickback condition still exists, install a new Hydro-Boost(R) brake booster. For additional information, refer to Power Brake Actuation Service and Repair.