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TM10-3930-660-20
8-18.
BRAKE HYDRAULIC PRESSURE SWITCH - REPLACE/TEST (Cont’d)
WARNING
Be certain that step 1 of REMOVAL
has been performed before performing
step 2c, below.
Serious injury from
hydraulic oil under pressure can result
if step 1 is not performed before
removing switch (1) in step 2c.
c. Remove brake hydraulic pressure
switch (1) from elbow (2) at brake
control valve (3).
INSTALLATI~
1.
2.
3.
4.
APPLY LOCTITE 59241 TO THREADS OF
SWITCH (1).
SCREW SWITCH (1) INTO ELBOW (2).
CONNECT TWO FEMALE CONNECTORS (4)
FROM VEHICLE WIRING HARNESS TO TWO
MALE CONNECTORS (5) ON SWITCH (1).
APPLY ANTI-FUNGUS VARNISH TO
CONNECTORS (4) AND (5).
CONNECT NEGATIVE BATTERY CABLE,
PARA. 8-44.
TESTING
1. TAG AND REMOVE TWO FEMALE CONNECTORS
(4) FROM MALE CONNECTORS (5) AT BRAKE
2.
3.
HYDRAULIC PRESSURE SWITCH (l).
CONNECT AN OHMMETER ACROSS MALE
CONNECTORS (5) OF SWITCH (l).
TEST SWITCH (1) FOR PROPER OPERATION.
a.
b.
c.
With the engine off, pump the
brake pedal a minimum of 20 times
to exhaust stored pressure in the
brake system.
Observe the ohmmeter. It should
indicate continuity.
Start the vehicle to allow the
brake system accumulator to
charge.
The ohmmeter should
indicate no continuity”
8-39
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