Notice: When replacing tubing, make sure that the tubing is free of burrs, cuttings, and dirt. While wearing safety glasses, use compressed air to blow out contaminants. Contaminants can destroy the air brake valve sealants.

1. Apply the parking brake.
2. Block the wheels.
3. Exhaust the air from the lines. Refer to Draining Reservoirs
4. Remove the air line.



5. Unscrew the nipple from the socket and the flexible hose.



6. Disassemble the flexible hose. Turn the hose clockwise to unscrew the hose from the socket.
7. Clean the nipple and the socket with a clean cloth.
8. Inspect the nipple and the socket for nicks, burrs and wear spots. Replace as needed.
9. Use a fine tooth hacksaw or cutting wheel in order to cut the flexible hose square to the same length as the original part.
10. Assemble the flexible hose into the socket. Turn the hose counterclockwise in the socket until the hose bottoms; then back off the flexible hose 1/4 turn.
11. Assemble the nipple.
12. Lubricate the nipple threads with clean engine oil.
13. Tighten the nipple.
14. Leave 0.8 mm (0.03 in) clearance between the nipple hex and the socket.

1. Install the air line.
2. Start the engine.
3. Charge the system air pressure to the governor cut-out point.
4. Check for leaks with a soap solution.
5. No leakage is permissible.
6. Check for proper brake operation.
7. Remove the wheel blocks.