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4
Component Replacement
41
WABCO
Maintenance Manual MM-0112 (Revised 07-18)
Figure 4.4
6
.
Remove the two mounting capscrews and nuts.
7.
Remove the ABS valve.
Installation
CAUTION
Moisture can affect the performance of all ABS/ATC systems,
as well as the standard braking system. Moisture in air lines
can cause air lines to freeze in cold weather.
1.
Install the ABS valve with two mounting capscrews and nuts.
Tighten the capscrews per the manufacturer’s
recommendation.
2.
Connect the line to the brake chambers to Port 2 of the ABS
valve. Connect the air supply line to Port 1 of the ABS valve.
3.
Connect the wiring connector to the ABS valve. Hand tighten
only.
4.
Remove the blocks and stands.
5.
Test the installation.
Checking the Installation
1.
Apply the brakes. Listen for leaks at the modulator valve.
2.
Turn the ignition on and listen to the modulator valve cycle. If
the valve fails to cycle, check the electrical cable connection.
Make repairs as needed.
3.
After any repair has been performed, cycle the ignition key and
test drive the vehicle. Verify that the ABS indicator lamp
operates correctly.
Active Braking Valves (ABV)
Removal
Depending on the OEM specs and vehicle system configuration,
ABVs may be located near the rear axle, front axle and in line with
trailer service/control line. Consult the vehicle OEM for exact
location of these valves.
WARNING
Park the vehicle on a level surface. Block the wheels to
prevent the vehicle from moving. Support the vehicle with
safety stands. Do not work under a vehicle supported only by
jacks. Jacks can slip and fall over. Serious personal injury and
damage to components can result.
1.
Turn the ignition switch to the OFF position. Apply the parking
brake.
2.
Place blocks under the front and rear tires to stop the vehicle
from moving.
3.
If necessary, raise the vehicle off the ground. Place safety
stands under the axle.
WARNING
Relieve line pressure by bleeding the air from the appropriate
supply tank. Pressurized air can cause serious personal injury.
4.
Disconnect the wiring from the valve.
5.
Disconnect the air lines from Port 1 (air supply), Port 2 (air
discharge) and Port 3 (treadle) of the ATC valve. Figure 4.5.
Figure 4.4
1002038a
PORT 1,
AIR IN
PORT 2,
AIR OUT