Hydraulic brake boosters are used on trucks with diesel engines.
REMOVAL & INSTALLATION
The accumulator contains high-pressure gas. Do NOT carry the booster by the accumulator or drop the unit on the accumulator.
- With the engine OFF , depress the brake pedal several times to discharge the accumulator.
- Remove the master cylinder.
- Remove the return hose and the two pressure lines from the booster.
- Remove the steering column knee bolster for access to the booster mounting nuts, if necessary.
- Remove the clip securing the booster push rod to the brake pedal and disconnect the push rod from the pedal.
- Remove the nuts from the booster mounting studs.
- Remove the booster.
If the booster is being replaced, ensure that the replacement unit is identical to the original. Refer to identification code letters stamped on the forward face.
- Reverse the removal procedure.
- Tighten the mounting nuts to 21 ft. lbs. (28 Nm).
- Inspect the O-rings on the pressure line fittings to ensure they are in good condition. Replace them if questionable.
- Tighten the pressure lines to 21 ft. lbs. (28 Nm).
- The remainder of the procedure is the reverse of removal.
Bleed the booster after installation is completed:
- Fill the power steering pump reservoir.
- Disconnect the fuel shutdown relay and crank the engine for several seconds.
- Check the fluid level and add if necessary.
- Reconnect the fuel shutdown relay and start the engine.
- Turn the steering wheel slowly from lock to lock.
- Stop the engine and discharge the accumulator by depressing the brake pedal five times.
- Start the engine and turn the steering wheel slowly from lock to lock twice.
- Shut off the engine and make a final check of fluid level.