Chrysler RAM TRUCK 2500 1994 Service Manual page 176

• POWER BRAKE BOOSTER—BRAKE PEDAL—BRAKELIGHT SWITCH 5 - 17
Fig. 4 Removing/Installing Master Cylinder And
Valves As Assembly
Fig. 5 Knee Bolster Removal
Fig. 6 Booster Push Rod Attachment At Brake Pedal
POWER BRAKE BOOSTER INSTALLATION
(1) I f new booster is being installed, check code let­
ters to verify that correct booster is being installed.
Fig. 7 Power Brake Booster Mounting
(2) Position booster on engine compartment dash
panel. Have helper hold booster i n position i f neces­
sary.
(3) Install and tighten booster mounting stud nuts
to 23-34 N-m (200-300 in. lbs.) torque.
(4) Connect booster push rod to brake pedal (Fig.
4).
(5) Install knee bolster.
(6) Connect vacuum hose to booster check valve.
(7) Install master cylinder and valves on booster as
assembly (Fig. 2). Tighten mounting nuts to 23-34
N-m (200-300 in. lbs.) torque.
(8) Connect front/rear brakelines to combination
valve and RWAL valve. Tighten brakeline fittings to
16-23 N-m (140-200 in. lbs.) torque.
(9) Connect harness wires to RWAL valve and
pressure differential switch on combination valve.
(10) Fill and bleed brake system. Refer to proce­
dures in appropriate antilock brake section.
BRAKELIGHT SWITCH REMOVAL
(1) Remove knee bolster (Fig. 5) for access to
brakelight switch and pedal (Fig. 8).
(2) Press and hold brake pedal i n applied position.
(3) Rotate brakelight counterclockwise about 30° to
align switch lock tab with notch i n bracket.
(4) Pull switch rearward out of mounting bracket
and release brake pedal.
(5) I f switch is to be tested or replaced, disconnect
wire harness and remove switch from vehicle.
BRAKELIGHT SWITCH TEST AND DIAGNOSIS
Brakelight switch operation can be tested with an
ohmmeter. The ohmmeter is used to check continuity
between the pin terminals at different plunger posi­
tions (Fig. 9).
The switch wire harness, must be discon­
nected before testing switch continuity.