ABS-MT-SH
M939 SERIES ANTI-LOCK BRAKE SYSTEM
MAINTENANCE SUSTAINMENT TRAINING; Student Handout ABS-MT-SH
ABS-MT-SH - Page 12 of 19
13
ABS Component Familiarization
&
SENSORS
- Located on rear axles.
Mounted using a bracket
to the axle spider plate.
&
TONER/ EXCITER RINGS
- Mounted on inside face of
brake drums.
&
Relay Valves w/Modulators-
Mounted in place of OEM relay
valves.
Located between both rear axle assemblies.
&
Electronic Control Unit (ECU)-
Mounted on forward Relay
Valve between rear axle assemblies.
&
Inversion Valve-
Mounted on panel inside Driver’s Step Box
below cab door.
&
Double Check valve #7-
Mounted to inlet of Spring Brake
Tank.
&
LQ2 valve-
Mounted in same location of existing front
proportioning valve or QR Valve.
No required additional
plumbing.
&
ABS Warning Light-
Located on Driver’s Instrument Panel.
&
In-line protective Fuses-
15 amp located under driver’s
dashboard (left of steering column).
3 amp located under
driver’s dash board (right of steering column).
&
Air Dryer Assembly-
Mounted on cross member forward of
intermediate axle.
(M936 Wrecker is mounted on exterior
frame rail (Curb-side)
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