11
Installation
When mounting the ECU/dual modulator valve assembly to the trailer cross member, refer to SAE
specifi cation J447, Prevention of Corrosion of Motor Vehicle Body and Chassis Components. Follow all
recommendations and procedures. Your supervisor should have a copy of this specifi cation.
1. Install a 3/4-inch NPT fi tting in the supply port. Use a 3/4-inch NPT pipe plug to plug the unused
supply port (Port 1). Apply SAE-standard, DOT-approved sealing paste to either the fi rst few threads
or over the whole length. Pipes with pre-applied thread sealant may also be used.
2. Locate a position for mounting the assembly to the vehicle cross member midway between the side
rails, close to the brake chambers the valve serves.
Drill two 3/8-inch mounting holes. The distance between the two holes (O.D.) must be
3-13/16-inches (97.2 mm) and mount directly to the cross member.
OR
Build a mounting bracket with two 3/8-inch mounting holes spaced 3-13/16-inches (97.2 mm) O.D.
apart.
3. Use two 3/8-inch Grade 8 bolts with prevailing torque nuts to attach the assembly. Tighten the bolts to
26 lb-ft (35 ± 3 Nm).
5.1.3 Attach the ABS External Relay Valve (4S/3M Systems Only)
The ABS external relay valve, part number 472 195 033 0, may be mounted on the air tank or on the cross
member of the vehicle.
5.1.4 Tank-Mounted
WARNING
You must use a Schedule 80 hex nipple (3/4-inch NPTF) to mount the ABS external relay valve
assembly securely to the air tank to avoid possible serious personal injury and damage to the
component.
1. Use a 3/4-inch NPTF Schedule 80 hex nipple to attach the relay valve assembly to a reinforced air
tank. Do not overtighten, potential damage to the valve could occur.
NOTICE
WABCO does not recommend the use of a vise when installing the hex nipple. Use of a vise may
cause overclamping. Overclamping may damage the internal components of the ECU/dual modulator
valve assembly.
2. Use a 3/4-inch NPTF pipe plug to plug the unused supply port. Apply SAE-standard, DOT-approved
sealing paste to either the fi rst few threads or over the whole length. Pipes with pre-applied thread
sealant may also be used.
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