Chrysler RAM TRUCK 2500 1994 Service Manual page 177

5 - 18 POWER BRAKE BOOSTER—BRAKE PEDAL—BRAKELIGHT SWITCH
•
PEDAL SWITCH
BRAKELIGHT
SWITCH J9405-87
Fig. 8 Brakelight Switch Location
Switch Circuit Identification
• Switch terminals 1 and 2 are for the brake sensor
circuit
• Switch terminals 5 and 6 are for the brakelight
circuit
• Switch terminals 3 and 4 are for the speed control
circuit
TERMINAL
PINS
Fig. 9 Brakelight Switch Terminal Identification And
Plunger Test Position
Switch Continuity Test Procedure
(1) Check continuity between terminal pins 5 and
6 as follows:
(a) Pull plunger all the way out to fully extended
position.
(b) Attach test leads to pins 5 and 6 and note
ohmmeter reading.
(c) I f continuity exists, proceed to next test. Re­
place switch i f meter indicates lack of continuity
(shorted or open).
(2) Check continuity between terminal pins 1 and
2 and pins 3 and 4 as follows:
(a) Push switch plunger inward to fully retracted
position.
(b) Attach test leads to pins 1 and 2 and note
ohmmeter reading.
(c) I f continuity exists, switch is OK. Replace
switch i f meter indicates lack of continuity (shorted
or open).
BRAKELIGHT SWITCH ADJUSTMENT AND
INSTALLATION
(1) Pull switch plunger all the way out to fully ex­
tended position.
(2) Connect harness wires to switch.
(3) Press and hold brake pedal down.
(4) Install switch as follows: Align tab on switch
with notch i n switch bracket (Fig. 10). Then insert
switch i n bracket and turn i t clockwise about 30° to
lock i t i n place.
(5) Release brake pedal. Then pull pedal fully rear­
ward. Pedal will adjust switch plunger to correct po­
sition as pedal is moved back. Switch will make
racheting sound as i t self adjusts.
Fig. 10 Brakelight Switch Installation
BRAKE PEDAL REMOWAL
(1) Remove knee bolster for access to brakelight
switch and pedal (Fig. 5).
(2) Remove brakelight switch (Fig. 8).
(3) Remove brakelight switch bracket (Fig. 11).
Bracket is attached to pedal mounting bracket with
two screws and clip nuts.
(4) Remove clip and washer attaching booster push
rod to brake pedal (Fig. 6). Then slide push rod off
pedal.
(5) Remove E-clip from passenger side of pedal
shaft (Fig. 12). Use flat blade screwdriver to pry clip
out of shaft groove.
(6) Push shaft toward driver side of bracket just
enough to expose opposite E-clip. Then remove E-Clip
with flat blade screwdriver.
(7) Push pedal shaft back and out of passenger
side of bracket (Fig. 12).