4
Component Replacement
44
WABCO
Maintenance Manual MM-0112 (Revised 07-18)
Active Braking Valve on the ABS Valve
Package
Removal
NOTE:
If there is enough room to work, it is not necessary to
remove the valve package from the vehicle before replacing the
active braking valve (solenoid valve). If the valve package must be
removed, follow the instructions for removing and replacing the ABS
Valve Package that appear in this section of the manual.
WARNING
Relieve line pressure by bleeding air from the appropriate
supply tank. Pressurized air can cause serious personal injury.
When installing the new active braking valve (solenoid valve) on the
valve package, you must use the new O-rings, seals, mounting bolts
and lubricant included with the replacement kit.
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 solenoid valve.
5.
Disconnect the supply air line from the adapter and the treadle
air line from the solenoid valve.
6
.
Use a 5 mm Allen wrench to remove the two screws that hold
the adapter piece to the relay valve portion of the valve
package.
7.
Use a
6
mm Allen wrench to remove the two mounting bolts
that hold the solenoid valve to the adapter piece. Remove the
solenoid valve from the adapter piece. Remove the solenoid
valve.
8.
Remove the adapter piece, seal and O-rings from the valve
package. Figure 4.9.
Figure 4.9
Installation
1.
Clean and lubricate the small adapter piece O-ring. Install the
O-ring on the adapter piece.
2.
Use the two new M8 Allen-head bolts to attach the solenoid
valve to the adapter piece. Use a
6
mm Allen-head tool to
tighten to 13-15 lb-ft (18-20 N
폷
m). Figure 4.10.
@
Figure 4.10
Figure 4.9
Figure 4.10
400784
9a
MOUNTING BOLTS
SEAL
O-RINGS
ADAPTER
SUPPLY
AIR LINE
ACTIVE
BRAKING VALVE
(SOLENOID VALVE)
TREADLE
AIR LINE
4007850
a
MOUNTING BOLTS
12-13 FT-LB (18-20 N m)
•
SEAL
ADAPTER
O-RING
ACTIVE
BRAKING VALVE
(SOLENOID VALVE)
