
4 Component Replacement
40
Meritor WABCO Maintenance Manual MM-0112 (Revised 05-13)
Figure 4.5
7. Remove the two mounting capscrews and nuts. Remove the
valve.
Installation
1. Install the valve with two mounting capscrews and nuts.
Tighten the capscrews per the manufacturer’s
recommendation.
2. Connect the air supply, discharge and treadle lines to Ports 1,
2 and 3 of the valve.
3. Connect the harness connector to the valve. Hand tighten only.
4. Remove the blocks and stands.
5. Test the installation.
Checking the ABV Installation
To test the active braking valve:
1. Turn the ignition to the ON position and verify that the ATC/
Stability Control lamp operates correctly.
2. Start the vehicle.
3. Fully charge the reservoirs with air. Shut off the vehicle.
4. Apply the brakes.
5. Listen for air leaks at the valve.
6. Release the brakes.
7. Activate the valve using TOOLBOX™ Software. Verify correct
operation and that there are no active codes.
8. Make necessary repairs if needed.
9. Drive the vehicle. Verify that the ATC indicator lamp operates
correctly.
Checking the Trailer ABV Installation
1. Connect the blue glad hand to a 50 cu. in. (819 cu. cm) air
tank.
2. Start the vehicle.
3. Fully charge the reservoirs with air. Shut off the vehicle.
4. Activate the valve using TOOLBOX™ Software; verify correct
operation and no active codes.
5. Listen for air leaks at the valve.
6. Make necessary repairs if needed.
7. Turn the ignition ON. Verify that the ATC/Stability Control
indicator lamp operates correctly.
ABS Valve Packages
Removal and Installation — Complete Package
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. Place blocks under tires to stop the vehicle from moving.
2. If necessary, raise the tires off the ground.
3. Drain the air from all system air tanks.
4. Remove all the air lines and connections from the ABS valve
package. Figure 4.6 and Figure 4.7.
Figure 4.6
Figure 4.5
1002039a
AIR
LINES
PORT 1,
AIR SUPPLY
AIR LINE
PORT 3,
TREADLE
VALVE CONTROL
DO NOT OPEN
PORT 2,
AIR DISCHARGE
Figure 4.6
4007847a
472 500 30. 0
MADE IN GERMANY
001 20/98
SUPPLY PORT
1/2" NPT
QUICK RELEASE
VALVE
1/2" NPT
DELIVERY
PORTS
MODULATOR
VALVE
ABS QUICK RELEASE VALVE PACKAGE
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