PS Magazine - TB 43-PS-678

PS, The Preventative Maintenance Monthly

ISSUE 678

MAY 2009
PS Magazine - TB 43-PS-678 - Page 8 of 33
12
PS 678
MAY 09
13
PS 678
MAY 09
S
omething is wrong when the brake warning light stays on (no kidding!). But before you
replace any parts, make sure you bleed the vehicle’s brake lines.
Air trapped in the lines can cause the light. Your time and new parts can be wasted if
you don’t bleevd the brakes Frst.
If the light stays on after bleeding, use the troubleshooting info starting on Page 2-342
of TM 9-2320-280-20-1 and Page 2-328 of TM 9-2320-387-24-1. If the proportioning valve is
the culprit, replace it. Use NSN 4820-01-186-0822 to get the valve for basic HMMWVs.
±or A1 and A2 HMMWVs,
use proportioning valve,
ECV-series HMMWVs come
with two proportioning
valves. ±or the valve closest
to the master cylinder, use
NSN 2530-01-473-2724. ±or
the other valve use NSN
Do not try to save a
“bad” valve by taking it
apart and adjusting it.
Any tampering ruins the
calibration set at
vthe factory.
When you replace the proportioning valve, add a light coat of lube, NSN 9150-00-273-
2389, to the valve’s electrical connector pins. A little lube heads off corrosion.
The mirror in this kit is larger than
the older-style side view mirror, and
also has a convex, wide-angle view
area that improves the driver’s feld
oF view.
Use
riveter,
NSN
5180-01-201-
4978,
From
the
vehicle’s
special
tools, to install the blind rivnuts that
come with the kit. They provide the
threaded holes For the bolts that hold
the mirrors on the truck.
N
eed new storage boxes or compartments for your
M872-series
semitrailer?
Well,
you’ve
probably
noticed that the vehicle’s parts manual is no help, so
listen up.
The boxes are not available through the supply
system. They must be fabricated at your support shop.
Call:
DSN 786-5281
Comm
(586) 574-5281
Email:
lisa.willis
@us.army.mil
Or, write:
USA TACOM
ATTN: AMSTA-LC-CHT (Lisa Willis)
6501 E 11 Mile Road
Warren, MI 48397-5000
HMMWV…
Brake Warning
Light On?
HMMWVs…
West
Coast
Mirror
M872-Series Semitrailers…
Plans
for
Storage Boxes
To get plans for
the boxes and
compartments,
contact Lisa
Willis at TACOM’s
Trailers &
Tactical Fleet
Assessment
Group.
For a clear
view, use NSN
2540-01-436-
1626 to get me
a “West Coast”
mirror kit.
Mount new
mirrors to
windshield
frame
That brake warning
light is
still
on!
Maybe I should
just cover it with
electrical tape.
..
There’s a
better
solution than
that! read on…
Pressure
limiting
valves
Hydro-
boost
To rear brakes
To front brakes
Proportioning valves
Master cylinder
reservoir
678.12-13.indd
1-2
3/31/09
2:01:26 PM
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