1 Introduction
6
Meritor WABCO Maintenance Manual MM-0112 (Revised 07-05)
Easy Listening Tip!
To ensure the ABS valves are working — just listen! Figure 1.5.
Figure 1.5
1. Apply the brakes.
2. Turn on the ignition.
3. Wait for the ABS indicator lamp to come on.
NOTE: In previous versions of ABS, the valves are cycled
diagonally. Diagonal cycling does not occur with E version ABS.
4. Listen to the valves cycle one by one, then together diagonally,
as follows:
앫 4M (channel) valve cycle order:
1 – 2 – 3 – 4
앫 6M (channel) valve cycle order:
1 – 2 –3 – 4 – 5 – 6
ABS Valve Packages
The front ABS valve package combines a quick release valve with
two ABS modulator valves and is mounted in the front of the vehicle.
The rear ABS valve package combines a service brake relay valve
with two ABS modulator valves and is mounted in the rear of the
vehicle. The valve package, front or rear, must be mounted near the
brake chambers it serves. Figure 1.6.
Figure 1.5
3 1
2 4
4 1
3 6
2 5
1002006d
4M CHANNEL
CAB
CURBSIDE
CAB
CURBSIDE
6M CHANNEL
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