For 1990-2009 cars only
Removal Procedure
- Block the wheels.
- Cage the rear air brake chambers. Refer to Caging the Rear Air Brake Chamber.
- Drain all air reservoirs. Refer to Air Brake Reservoir Draining.
- Remove the retainer.
- Remove the clevis pin.
- Fully release the slack adjuster by turning the slack adjuster counterclockwise. Continue the operation until the slack adjuster arm is free from the clevis.
- Loosen the jam nut.
- Remove the clevis and the jam nut.
- Inspect the service brake chamber pushrod for damage.
Overhaul or replace the service brake chamber if damaged.
Installation Procedure
- Loosely assemble the jam nut and the air brake chamber clevis to the service brake chamber pushrod.
- Adjust the clevis.
- Measure the rear air brake chamber clevis to 68.5 mm (2.69 in) from the mounting surface of the spring brake chamber to the center of the air brake chamber clevis pin mounting hole.
- Rotate the adjusting hex of the slack adjuster clockwise.
- Install the air brake chamber clevis pin.
- Install the air brake chamber clevis pin cotter pin.
- Adjust the brakes. Refer to Air Drum Brake Adjustment.
- Start the engine.
- Charge the system to the air compressor governor valve cut-out point.
- Stop the engine.
- Uncage the rear air brake chambers. Refer to Caging the Rear Air Brake Chamber.
- Check for the proper brake operation.
- Apply the parking brake.
- Remove the wheel blocks.
Turn the air brake chamber clevis clockwise in order to decrease the distance and counterclockwise in order to increase the distance.
Caution: Refer to Fastener Caution in the Preface section.
Tighten
Tighten the rear air brake chamber clevis jam nut, type 16 service air brake chamber, to 45 N·m (33 lb ft).
Continue the operation until the arm hole of the slack adjuster lines up with the clevis hole.
