parking brake JEEP CHEROKEE 1988 Service Repair Manual

Resistance value should be about 22 ohms. Measure resistance between
either terminal and battery negative post. Resistance value should be
infinite. If resistance values are not as specified, replace relay. If
okay, reconnect electrical connectors.
2) Disconnect electrical connector from "SOL" terminal.
Connect voltmeter between terminal and battery negative post. While
observing voltmeter, turn ignition switch to "START" position. If 12
volts is not indicated, check and repair wiring harness, bulkhead
connector, and/or ignition switch. If battery voltage is present, go
to next step.
3) If battery voltage is present, but starter relay does not
work, place transmission in Park (Neutral for man. trans.) and apply
parking brake. Disconnect electrical connector from terminal "I" (Dark
Green wire) and apply battery voltage to terminal. Using a jumper
wire, touch terminal "G" to ground. If relay does not click, replace
relay. If relay does click, repair ground circuit.
Fig. 7: Design & Function of Relays
REMOVAL & INSTALLATION

Installation
1) Install brake switch in retainer. Reconnect brake switch
electrical connector.
2) To check brake switch adjustment, slightly depress brake
pedal and note operation of brake switch plunger. Brake switch plunger
should fully extend when brake pedal free play is taken up and brake
application begins.
3) Clearance between brake switch plunger and brake pedal
should be approximately 1/8". If clearance is not within
specification, pull brake pedal rearward as far as possible.
4) Brake pedal should contact brake switch plunger, pushing
brake switch backward in retainer to provide proper adjustment. Ensure
brake lights operate.
5) Recheck clearance between brake switch plunger and brake
pedal with brake pedal depressed and free play taken up. Reinstall
lower steering column cover or trim panels.
NEUTRAL SAFETY SWITCH
NOTE: Neutral safety switch may be referred to as park/neutral or
gear select switch.
Removal
1) Apply parking brake. Raise and support vehicle. Disconnect
electrical connector at neutral safety switch. Pry lock washer tabs
away from retaining nut. See Fig. 126.
2) Remove retaining nut, lock washer and adjusting bolt. See
Fig. 126 . Remove neutral safety switch from manual valve shaft.
Installation
1) Disconnect shift control rod from transmission shift
lever. Rotate transmission shift lever fully rearward and then forward
2 detents to Neutral position.
2) Install neutral safety switch on manual valve shaft.
Install adjusting bolt but DO NOT tighten at this time.
3) Install lock washer and retaining nut. Tighten retaining
nut to specification. See TORQUE SPECIFICATIONS. DO NOT bend over lock
washer tabs at this time.
4) Ensure transmission is still in Neutral. Rotate neutral
safety switch and align neutral standard line with vertical groove on
manual valve shaft. See Fig. 126.
5) Tighten the adjusting bolt to specification. Refer to the
TORQUE SPECIFICATIONS table. Bend lock washer tabs over. Reconnect
shift control rod and electrical connector. Ensure vehicle starts in
Park and Neutral only.
Fig. 126: Installing Neutral Safety Switch
Courtesy of Chrysler Corp.
SPEED SENSOR

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* B RAK E S YSTE M U NIF O RM IN SPEC TIO N G UID ELIN ES *

1 988 J e ep C hero ke e
GENERAL INFORMATION
Brake Systems - Motorist Assurance Program
Standards For Automotive Repair
All Makes & Models
CONTENTS
OVERVIEW OF MOTORIST ASSURANCE PROGRAM
OVERVIEW OF SERVICE REQUIREMENTS AND SUGGESTIONS
ACCELEROMETERS (G SENSOR OR LATERAL)
ACCUMULATORS
ANCHOR PINS
ANTI-LOCK BRAKE SYSTEMS
BACKING PLATES
BRAKE FLUID
BRAKE FRICTION MATERIAL
BRAKE PADS
BRAKE PEDALS
BRAKE SHOES
BRAKE SHOE HARDWARE
BRAKE STOPLIGHT SWITCHES
BULB SOCKETS
BULBS AND LEDS
CALIPER HARDWARE
CALIPERS
CONTROLLERS
DIGITAL RATIO AXLE CONTROLLERS AND BUFFERS (DRAC AND DRAB)
DISABLE SWITCHES
DRUMS
ELECTRICAL PUMPS AND MOTORS
ELECTRONIC CONTROLLERS
FLUID
FLUID LEVEL SENSOR SWITCHES
FOUR WHEEL DRIVE SWITCHES
FRICTION MATERIAL
G SENSORS
HOSES
HYDRAULIC MODULATORS
HYDRO-BOOSTERS
HYDRO-ELECTRIC BOOSTERS (POWERMASTER)
IGNITION DISABLE SWITCHES
LATERAL ACCELERATION SWITCHES
LEDS
LENSES
MASTER CYLINDERS
MODULATORS
MOTORS
PARKING BRAKE SWITCHES
PARKING BRAKE SYSTEMS
PADS
PEDAL TRAVEL SWITCHES
PEDALS
POWERMASTER
PUMPS
PRESSURE DIFFERENTIAL SWITCHES
PRESSURE SWITCHES
RELAYS
ROTORS
SELF-ADJUSTING SYSTEMS

CALIPER INSPECTION








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Condition Code Procedure
Bleeder port damaged .... A ... Require repair or replacement
of caliper.
Bleeder screw broken off
in caliper ............. A ........... (1) Require repair or
replacement of caliper.
Bleeder screw plugged ... A ........... ( 1) Require repair or
replacement of bleeder screw.
Bleeder screw seized .... A ......... ( 2) Require replacement
of caliper.
Casting corroded,
affecting structural
integrity .............. A ............ Require replacement.
Casting damaged, affecting
structural integrity ... A ............ Require replacement.
Dust boot around caliper
torn ................... A ..... Require replacement of dust
boot.
Leaking ................. A .. Require repair or replacement.
Mounting pin threads
damaged ................ A ... Require repair or replacement
of component with damaged
threads.
Mounting pin threads
stripped in caliper
bracket (threads
missing) ............... A ... Require repair or replacement
of caliper bracket.
Mounting pin threads
stripped in steering
knuckle (threads
missing) ............... A ... Require repair or replacement
of steering knuckle.
Mounting pin threads
stripped (threads
missing) ............... A ... Require repair or replacement
of component with stripped
threads.
Parking brake cable
support, lever, or return
spring bent ............ A ... Require replacement of parts.
Parking brake cable
support, lever, or return
spring broken .......... A ... Require replacement of parts.
Parking brake mechanism in
caliper inoperative .... A .. Require repair or replacement.
Piston corroded (pitted
or peeling chrome
plating) ............... B ... Require replacement of piston
and rebuilding or replacement
of caliper.
Piston damaged, affecting
performance ............ B ... Require replacement of piston
and rebuilding or replacement
of caliper.
Piston damaged, not
affecting performance .. .. ........ No service suggested or
required.
Piston finish worn off .. B ... Require replacement of piston
and rebuilding or replacement

(1) - This condition may be normal on some vehicles equipped with
anti-lock brakes.
( 2) - Refer to OEM procedures for adjusting low fluid level.
Inspect for brake hydraulic system leaks and friction
material wear.
( 3) - This condition may indicate contaminated brake fluid.
See BRAKE FLUID .









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MODULATORS
See HYDRAULIC MODULATORS .
MOTORS
See ELECTRICAL PUMPS AND MOTORS .
PARKING BRAKE SWITCHES
See SWITCHES.
PARKING BRAKE SYSTEMS
NOTE: The parking brake is an integral part of the brake
system. It is important that the parking brake function
properly when brake service is performed.
PARKING BRAKE SYSTEM INSPECTION









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Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Cable improperly
adjusted ............... B ....... Require cable adjustment.
Cable or individual
wires in the cable
are broken ............. A .... Require replacement of cable
assembly.
Cable sticking .......... A ...... Require cable lubrication.
Cable stuck inside conduit
and cannot be lubricated
so that parking brake
functions properly ..... A .... Require replacement of cable
assembly.
Inoperative ( 1) ......... A .......... Require replacement of
inoperative parts.
Parking brake
parts bent ............. B ... Require repair or replacement
of bent parts.
Parking brake
parts broken ........... A ... Require replacement of broken
parts.
Parking brake parts

Fig. 3: Back View of Valve Shaft
PARKING BRAKE - EXCEPT GRAND WAGONEER
1) Adjust rear brakes. Check cable for binds, kinks or frayed
condition. Replace cable (if necessary). Apply and release parking
brake 5 times.

2) On all models except Wrangler, place parking brake lever
in fifth notch. Raise vehicle. Using Adjustment Gauge (J-34651), apply\
a torque of 50-55 INCH lbs. (5-6 N.m). See Fig. 4.
3) Adjust nut on parking brake cable equalizer until pointer
is in Blue section of gauge. Apply and release parking brake cable 5
times. Check adjustment and readjust cable (if necessary).
Fig. 4: Parking Brake Adjustment (Except Grand Wagoneer)
Courtesy of American Motors/Jeep Corp.
PARKING BRAKE - GRAND WAGONEER

1) Adjust rear brakes. Check cable for binds, kinks or frayed
condition. Replace cable (if necessary). Release parking brake. Loosen\
lock nuts at parking brake cable equalizer under vehicle.
2) Tighten cables until wheels drag slightly when rotated by
hand. Loosen equalizer until wheels rotate freely and no drag is felt.
Tighten lock nuts and check operation of parking brake.
ROTOR SERVICING
RUNOUT
1) Measure rotor lateral runout by mounting a dial indicator
on support stand or steering spindle. Position indicator stylus so it
contacts center of rotor braking surface.
2) Zero indicator and turn rotor one revolution. Note
indicator reading. Runout must not exceed specification. See DISC
BRAKE ROTOR SPECIFICATIONS table. Refinish or replace rotor (if
necessary).
NOTE: Thickness of machined rotor must not be below minimum
thickness specification.
PARALLELISM
Measure rotor parallelism with a micrometer. Measure
thickness at 4 or more equally spaced points around rotor at
approximately 1" from edge of rotor. Variation must not exceed
specification. See DISC BRAKE ROTOR SPECIFICATIONS table. Refinish or
replace rotor (if necessary).
BRAKE SYSTEM BLEEDING
Hydraulic system bleeding is necessary any time air has been
introduced into system. Bleed brakes at all 4 wheels if master
cylinder lines have been disconnected or master cylinder has run dry.
Bleed brakes with vacuum bleeding equipment, pressure bleeding
equipment or by manually pumping brake pedal while using bleeder
tubes. Always bleed brake lines in sequence. See BLEEDING SEQUENCE
table.
MASTER CYLINDER BLEEDING
Bench Bleeding
1) Master cylinder must be bled before installation to
prevent excessive amounts of air from entering the brake system,
creating poor brake operation.
2) Place master cylinder in soft-jawed vise. DO NOT tighten
vise enough to damage master cylinder. Install bleeder tubes in both
outlets of master cylinder. See Fig. 5.

Removal
1) Raise vehicle and support with safety stands. Remove wheel
assembly and drum. Remove "U" clip and washer from parking brake lever
pivot pin. Place Wheel Cylinder Clamp (J-8002) over wheel cylinder.
2) Remove primary and secondary return springs, spring
retainers, hold-down springs and retaining pins. Remove adjuster
lever, adjuster screw and spring from brake shoes. Remove brake shoes.
See Fig. 9 .
Fig. 9: Exploded View of Drum Brake (W/Cable Operated Adjuster)
Courtesy of American Motors/Jeep Corp.
Installation
1) Lubricate support plate ledges, anchor pin, adjuster cable

guide, adjuster screw assembly, parking brake lever and lever pivot
pin with molybdenum disulphide grease.
2) Connect parking brake lever to secondary brake shoe with
washer and "U" clip. Crimp ends of clip to secure clip on pivot.
Remove wheel cylinder clamp. Position brake shoes on brake support
plate and install hold-down springs.
3) Install parking brake lever strut and spring. Install
adjuster cable guide plate and adjuster cable on anchor pin. Install
primary return spring. Install guide to secondary brake shoe. Install
secondary return spring.
4) Install adjuster screw, spring and lever. Connect lever to
cable. Using Brake Gauge (J-21177-01), preset brake shoe adjustment.
Install brake drums. Adjust brake shoes with drum in place.
5) Install wheels and lower vehicle. To adjust and balance
brake system, apply and release brakes 10-15 times while driving
forward and backward. Road test vehicle.
DRUM BRAKE SHOES - GRAND WAGONEER
Removal
1) Raise vehicle and support with safety stands. Remove
wheels. On models with full-floating rear axle, remove 2 screws that
retain drum on hub.
2) On all models, remove primary shoe return spring,
automatic adjuster actuator spring and secondary shoe return spring.
Remove hold-down springs. Remove brake shoe assemblies. See Fig. 10.
3) Disengage parking brake cable from parking brake lever.
Remove parking brake strut and brake shoe assembly as a unit. Place
wheel cylinder clamps over cylinders in order to retain pistons.
4) Inspect automatic adjuster lever and pivot, actuating
lever, parking brake lever, automatic adjuster and springs. Replace
weak springs, bent levers and parts that are worn or broken.
Fig. 10: Exploded View of Drum Brake Assembly (Grand Wagoneer)
Courtesy of American Motors/Jeep Corp.
Installation
1) Clean support plate. Apply a thin film of molybdenum