1. Disconnect the negative battery cable.
2. Remove the tie straps.
3. Disconnect the electrical connector.
4. Remove the air lines. Refer to in Air Brakes.



5. Remove the two mounting bolts (2), four washers (3) and two nuts (5).
6. Remove the modulator (4).

Important: It may be necessary to transfer the fittings from the old modulator to the replacement part.

1. Install the modulator to vehicle using two mounting bolts (2), four washers (3) and two nuts (5).

Tighten
Tighten the modulator nuts (5) to 70 N·m (52 lb ft).

2. Connect the air lines to the modulator valve.
3. Connect the modulator electrical connector.
4. Install the new tie straps.
5. Reconnect the negative battery cable.