The Modulator Control Unit (MCU) contains solenoid valves for each wheel. These valves are independent of each other and are positioned vertically for improved maintainability. The modulators for the rear wheels act as proportioning control valves to prevent the rear wheels from locking up in the event the anti-lock braking system is malfunctioning or not activated.
See Figure 1
REMOVAL & INSTALLATION
See Figure 2
- Disconnect the negative battery cable.
- Remove the modular unit mounting bolts.
- Detach the pump motors connectors.
- Disconnect the brake lines.
- Remove the modular unit from the bracket assembly.
- Install the modular unit.
- Connect the brake lines, using a flare nut wrench. Tighten the fittings to 11 ft. lbs. (15Nm).
- Connect the modulator unit.
- Attach the pump motor connectors.
- Begin with the front wheels, start bleeding the braking system.
- Bleed the rear wheels thoroughly after completion of the front.
- Connect the negative battery cable.
- After starting the engine, check to see of the ABS lamp is not on.
- Drive the vehicle and check that the ABS light does not come on.