TM 9--2350--292--20--1
0177 00--1
LOW BRAKE PRESSURE WARNING LIGHT COMES ON AND WARNING
HORN SOUNDS.
0177 00
THIS WORK PACKAGE COVERS:
Low Brake Pressure Warning Light Comes On And Warning Horn Sounds.
INITIAL SETUP:
Tools and Special Tools
General mechanic’s tool kit (item 1, WP 0717 00)
Multimeter (item 84, WP 0717 00)
Reducer (item 95, WP 0716 00)
Plug, 1/2 inch (2) (item 69, WP 0716 00)
0--4000 psi testing gauge assembly (item 82,
WP 0717 00)
Equipment Conditions
Vehicle MASTER switch OFF (TM 9--2350--292--10)
Subfloor plate 13 removed (WP 0454 00)
Personnel Required
Two
Did pressure gauge 500 psi (old configuration) or 550
psi (new configuration with brake modulation?
1. Pump brake pedal several times
(TM 9--2350--292--10).
2. Read brake pressure gauge on power boost
manifold.
3. Turn vehicle MASTER switch OFF
(TM 9--2350--292--10).
no
yes
no
yes
A
B
CONTINUED ON NEXT PAGE
1. Disconnect harness 4W155 lead 48 from low
brake pressure warning switch (WP 0328 00).
2. Disconnect harness 2W601 lead 591 from low
brake pressure warning switch (WP 0291 00).
3. Place one multimeter lead in low brake
pressure warning switch lead 48 connector and
place other multimeter lead in low brake
pressure warning switch lead 591. Check for
continuity.
Is continuity present?
WARNING
Remove rings, bracelets, wristwatches,
and neck chains before working on any
vehicle. Jewelry can catch on equip-
ment and cause injury, or may short
across an electrical circuit and cause
severe burns or electrical shock.
Go to Step F.
Replace low brake pressure
warning switch
(WP 0378 00 or WP 0379 00).
Verify fault is corrected.
FORWARD
