13
Installation
WARNING
When mounting the ECU/dual modulator valve assembly to the trailer cross member, refer to SAE
specification J447, Prevention of Corrosion of Motor Vehicle Body and Chassis Components. Follow
all recommendations and procedures. Your supervisor should have a copy of this specification.
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
3-25/32-inches (96 mm) and mount directly to the cross member.
OR
Build a mounting bracket with two 3/8-inch mounting holes spaced 3-25/32-inches (96 mm) O.D.
apart.
4014001b
TEMPLATE
PLUG UNUSED PORT
Exhaust port must face DOWN.
3-13/16“
4014006a
3. Use two 3/8-inch Grade 8 bolts with prevailing torque nuts and washers to attach the assembly to the
vehicle cross member. Tighten the bolts to 20 lb-ft (27 Nm).
5.2
Connect the Air Lines
Plumb the spring brake relay or emergency relay valve into the system as usual.
1. For bracket mounts, connect the air supply line from the supply tank to ECU/single modulator valve
assembly supply Port 1.
Use 5/8-inch O.D. min. nylon tubing for frame mounts.