4 Component Replacement
37
Meritor WABCO Maintenance Manual MM-0112 (Revised 07-05)
Checking the Installation
To test the ATC valve:
1. Start the vehicle.
2. Fully charge the reservoirs with air. Shut off the vehicle.
3. Apply the brakes.
4. Listen for air leaks at the ATC valve.
5. Release the brakes.
6. Activate the ATC valve using the MPSI tool.
7. Disconnect the MPSI tool.
8. Drive the vehicle. Verify that the ATC indicator lamp operates
correctly.
RSC Valve
Removal
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.
4. Relieve line pressure by bleeding the air from the
appropriate supply tank.
5. Disconnect the wiring from the RSC valve.
6. Disconnect the air lines from Port 1 (air supply), Port 2 (air
discharge) and Port 3 (treadle) of the RSC valve. Figure 4.6.
Figure 4.6
7. Remove the two mounting capscrews and nuts. Remove the
RSC valve.
Installation
1. Install the RSC 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 RSC valve.
3. Connect the harness connector to the RSC valve. Hand tighten
only.
4. Remove the blocks and stands.
5. Test the installation.
Checking the Installation
To test the RSC valve:
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 RSC valve using TOOLBOX™ Software.
5. Listen for air leaks at the RSC valve.
6. Make necessary repairs.
7. Turn the ignition on. Verify that the ATC/RSC indicator lamp
operates correctly.
Figure 4.6
1002039a
AIR
LINES
PORT 1,
AIR SUPPLY
AIR LINE
PORT 3,
TREADLE
VALVE CONTROL
DO NOT OPEN
PORT 2,
AIR DISCHARGE
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