Dodge Ram Truck 1500-2500-3500. Manual — part 214
TENSIONER-CABLE
ADJUSTMENTS
CABLE TENSIONER
NOTE: Tensioner adjustment is only necessary
when the tensioner, or a cable has been replaced
or disconnected for service. When adjustment is
necessary, perform adjustment only as described
in the following procedure. This is necessary to
avoid faulty park brake operation.
1. Raise the vehicle.
2. Back off the cable tensioner adjusting nut (5) to
create slack in the cables.
3. Remove the rear wheel/tire assemblies. Then remove the brake rotors (Refer to 5 - BRAKES/HYDRAULIC/ME-
CHANICAL/ROTORS - REMOVAL).
4. Verify the brakes are in good condition and operating properly.
5. Verify the park brake cables operate freely and are not binding, or seized.
6. Check the rear brake shoe adjustment with standard brake gauge (Refer to 5 - BRAKES/PARKING BRAKE/
SHOES - ADJUSTMENTS).
7. Install the rotors (Refer to 5 - BRAKES/HYDRAULIC/MECHANICAL/ROTORS - INSTALLATION) and verify that
the rotors rotate freely without drag.
8. Install the wheel/tire assemblies, (Refer to 22 - TIRES/WHEELS/WHEELS - STANDARD PROCEDURE).
9. Lower the vehicle enough for access to the park brake foot pedal. Then fully apply the park brakes.
NOTE: Leave park brakes applied until adjustment is complete.
10. Raise the vehicle again.
11. Mark the tensioner rod 6.35 mm (1/4 in.) from
edge of the tensioner (2).
12. Tighten the adjusting nut (5) on the tensioner rod
until the mark is no longer visible.
CAUTION: Do not loosen, or tighten the tensioner
adjusting nut for any reason after completing
adjustment.
13. Lower the vehicle until the rear wheels are 15-20
cm (6-8 in.) off the shop floor.
14. Release the park brake foot pedal and verify that
rear wheels rotate freely without drag. Then lower
the vehicle.
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BRAKES - BASE - SERVICE INFORMATION
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HANDLE-RELEASE
REMOVAL
1. Disconnect and isolate the battery negative cable.
2. Reach under the driver side outboard end of the instrument panel to access and unsnap the plastic retainer clip
that secures the park brake release linkage rod to the park brake mechanism on the left cowl side inner panel.
3. Disengage the park brake release linkage rod end from the park brake mechanism.
4. Lift the park brake release handle to access and unsnap the plastic retainer clip that secures the park brake
release linkage rod to the lever on the back of the park brake release handle.
5. Lower the park brake release handle and reach under the driver side outboard end of the instrument panel to
disengage the park brake release linkage rod end from the lever on the back of the park brake release handle.
6. Lift the park brake release handle to access the handle mounting bracket.
7.
Using a trim stick (4) or another suitable wide flat-
bladed tool, gently pry each of the park brake
release handle (6) mounting bracket latch tabs (5)
away from the retaining notches in the instrument
panel receptacle.
8. With both of the park brake release handle mount-
ing bracket latches released, slide the handle and
bracket assembly down and out of the instrument
panel receptacle.
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BRAKES - BASE - SERVICE INFORMATION
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INSTALLATION
1. Position the park brake release handle to the
instrument panel.
2. Slide the handle and bracket assembly up into the
instrument panel receptacle until both of the park
brake release handle (6) mounting bracket latches
are engaged with the notches in the instrument
panel receptacle.
3. Lower the park brake release handle and reach
under the driver side outboard end of the instru-
ment panel to engage the park brake release link-
age rod end with the lever on the back of the park
brake release handle (6).
4. Lift the park brake release handle to access and
snap the plastic retainer clip that secures the park
brake release linkage rod to the lever on the back
of the park brake release handle over the linkage
rod.
5. Reach under the driver side outboard end of the
instrument panel to access and engage the park
brake release linkage rod end to the park brake
mechanism.
6. Snap the plastic retainer clip that secures the park brake release linkage rod to the park brake mechanism on
the left cowl side inner panel over the linkage rod.
7. Reconnect the battery negative cable.
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BRAKES - BASE - SERVICE INFORMATION
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BRAKES - ABS - SERVICE INFORMATION
TABLE OF CONTENTS
page
page
BRAKES - ABS - SERVICE INFORMATION
. . . . . . . . . . . . . . . . . . . . . . . . 287
. . . . . . . . . . . . . . . . . . . . . . . . . . 287
. . . . . . . . . . . . . . . . 288
. . . . . . . . . . . . . . . . . . . . . 289
SENSOR- WHEEL SPEED-ABS-FRONT
. . . . . . . . . . . . . . . . . . . . . . . . 289
. . . . . . . . . . . . . . . . . . . . . . . . . . 289
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
. . . . . . . . . . . . . . . . . . . . . . . . 291
SENSOR-WHEEL SPEED-ABS-REAR
. . . . . . . . . . . . . . 291
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
. . . . . . . . . . . . . . . . . . . . . . . . 292
WHEEL-TONE
HYDRAULIC/MECHANICAL
DESCRIPTION - ELECTRONIC VARIABLE
. . . . . . . . . . . . . . 292
OPERATION - ELECTRONIC VARIABLE
. . . . . . . . . . . . . . 292
HCU (HYDRAULIC CONTROL UNIT)
. . . . . . . . . . . . . . . . . . . . . . . . 293
. . . . . . . . . . . . . . . . . . . . . . . . . . 293
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
. . . . . . . . . . . . . . . . . . . . . . . . 294
VALVE-RWAL
. . . . . . . . . . . . . . . . . . . . . . . . 295
. . . . . . . . . . . . . . . . . . . . . . . . . . 295
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
. . . . . . . . . . . . . . . . . . . . . . . . 296
BRAKES - ABS - SERVICE INFORMATION
DESCRIPTION
The antilock brake system (ABS) is an electronically operated, three channel brake control system. The vehicle has
Electronic Variable Brake Proportioning (EVBP) designed into the system which eliminates the combination/propor-
tioning valve.
The system is designed to prevent wheel lockup and maintain steering control during braking. Preventing lockup is
accomplished by modulating fluid pressure to the wheel brake units.
The hydraulic system is a three channel design. The front wheel brakes are controlled individually and the rear
wheel brakes in tandem. The ABS electrical system is separate from other electrical circuits in the vehicle. A spe-
cially programmed controller antilock brake unit operates the system components.
ABS system major components include:
•
Controller Antilock Brakes (CAB)
•
Hydraulic Control Unit (HCU)
•
Wheel Speed Sensors (WSS)
•
ABS Warning Light
OPERATION
Battery voltage is supplied to the CAB. The CAB performs a system initialization procedure at start up. A check of
the ABS motor is performed at 15 miles per hour. Initialization consists of a static and dynamic self check of system
electrical components.
The static and dynamic checks occurs at ignition start up. During the dynamic check, the CAB briefly cycles sole-
noids to verify operation. An audible noise may be heard during this self check. This noise should be considered
normal. The ABS motor and pump are then checked at a speed of 15 mile per hour.
If an ABS component exhibits a fault during initialization, the CAB illuminates the amber warning light and registers
a fault code in the microprocessor memory.
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BRAKES - ABS - SERVICE INFORMATION
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