13
Installation
4. For 4S/3M installations, perform the following procedures.
Connect the brake service (control) line to the ECU/dual modulator valve assembly Port 4
(3/8-inch NPTF) and ABS external relay valve control Port 4 (3/8-inch NPTF).
Use an ABS relay valve connection cable to connect the ECU/dual modulator valve assembly with
the ABS external relay valve.
5. Plug any unused delivery ports.
5.1.7 Install the Sensor Extension Cables (ABS-prepped Axles)
Instructions for installing sensors on non-ABS-prepped axles are included in Appendix I.
1. Visually inspect the tooth wheel and sensor to ensure no damage occurred during shipping. Perform
any necessary repairs before starting any installation.
2. Connect the sensors and cables on the prepped axles to the sensor extension cables. Figure 7.
Ensure that each connection is secure.
Fig. 7
SENSOR
EXTENSION
CABLE
SENSOR
AND CABLE
4003567b
3. Route the sensor cable along the back side of the trailer axle to the ECU/dual modulator valve
assembly. Route the cable with the brake hose.
Do not overtighten the tie wraps on a cable. Overtightening can damage the cable. Do not tie wrap the
molded sensor plug. The sensor extension cable must follow the brake hose to the ECU/dual modulator
valve assembly to allow for axle jounce and rebound.
4. Secure the cables every eight inches (203 mm) with tie wraps or cable clips.
5. Remove the protective plugs from sensors E and F for a 4S system.
6. Plug the sensor extension cables into the ECU/dual modulator valve assembly. To secure push the
sensor extension connection in until the locking tab seats.
7. Bundle any excess cable in a “Z”-shaped loop. Figure 8.