Service manual

Group 59 Anti-Lock Brake System (Bendix) Service Procedures
Rear Modulator Valve Replace-
ment
Removal
PERSONAL INJURY HAZARD! Before working on a
vehicle, set the parking brakes, place the transmission
in neutral, and block the wheels. Failure to do so can
result in unexpected vehicle movement and can cause
serious personal injury or death.
1
Park the vehicle on a level surface, ap-
ply the parking brake, and block the
wheels. Ensure vehicle ignition is OFF
and transmission is in neutral.
2
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Disconnect the electrical connector
from the valve.
3
Identify and label or mark modulator
valve air lines to facilitate installation.
4
Remove the air line(s) from the ser-
vice brake chamber(s) supplied by the
valve. Remove the P-clips and plastic
tie straps that hold the air line(s) in
place.
Note: Due to the non-rotating fittings
at the valve, the service brake cham-
ber air line(s) must be removed with
the valve.
5
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Using the air filter removal tool, dis-
connect the supply air line that comes
from the relay valve.
6
Remove the valve mounting screws
and nuts.
7
Remove the valve.
8
Remove the two service brake cham-
ber airline(s) from the valve.
9
Note the orientation of the fittings in
the valve, then remove the fittings.
Installation
1
Install the proper fittings on the valve
in the original orientation. Use tape or
paste-type thread sealant on fittings to
reduce the probability of leakage.
2
Connect the air line(s) for the service
brake chamber(s) to the valve.
3
Route the service brake chamber air
line(s) through the frame and to the
service brake chamber(s). Connect
the air line(s) to the chamber(s). Install
the P-clips and tie straps to hold the
air line(s) in place.
4
Mount the valve on the vehicle using
two bolts and nuts. Torque the nuts to
24 Nm (18 ft-lb).
24 Nm
(18 ft-lb)
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