1988 JEEP CHEROKEE Service Repair Manual

fuse oil change refuelling spare tire location coolant reservoir automatic transmission fluid

Page 297 of 1378

JEEP CHEROKEE 1988 Service Repair Manual FRICTION MATERIAL
NOTE: Original Equipment Manufacturer (OEM) specifications
designate replacement at different thicknesses.
CAUTION: It is required that friction material be mat

FRICTION MATERIAL
NOTE: Original Equipment Manufacturer (OEM) specifications
designate replacement at different thicknesses.
CAUTION: It is required that friction material be matched in axle
sets for consistent braking characteristics.
FRICTION MATERIAL INSPECTION
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Condition Code Procedure
Contaminated, for example,
fluid that leaked from
caliper, wheel cylinder,
or axle seal ........... A ........ ( 1) Require replacement.
Cracked through ......... B Require replacement.
Flaking or chunking ..... B Require replacement.
Glazed (shiny) .......... .. ........ No service suggested or
required.
Grooves or ridges ....... .. .... ( 2) No service suggested or
required.
Permanently attached
hardware bent .......... A ............ Require replacement.
Permanently attached
hardware broken ........ A ............ Require replacement.
Permanently attached
hardware loose ......... A ............ Require replacement.
Permanently attached
hardware missing ....... C ............ Require replacement.
Permanently attached
hardware seized ........ A .. Require repair or replacement.
Rivets loose ............ B ............ Require replacement.
Separating from backing . B ............ Require replacement.
Shoe table or web bent .. B ............ Require replacement.
Shoe table or web
cracked ................ A ............ Require replacement.
Shoe table or web worn,
affecting performance .. A ............ Require replacement.
Surface cracking ........ .. ........ No service suggested or
required. Further inspection
may be necessary to determine
cause.
Tapered wear ............ B ........ ( 3) Suggest replacement.
Thickness of one pad is
greater than opposite pad
in the same caliper
(uneven wear) .......... .. .... ( 4) Replacement of friction
material not suggested or
required. Further inspection
required. See CALIPERS
and CALIPER HARDWARE.
Wear indicator device
(electronic) contacts
rotor .................. B ...... ( 5) Require replacement of
appropriate parts.
Wear indicator device
(mechanical) bent ....... .. .......... ( 6) Further inspection
required.
Wear indicator device
(mechanical) broken .... .. ......... ( 6) Further inspection
required.

Page 298 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Wear indicator device
(mechanical) contacts
rotor .................. .. ......... (6) Further inspection
required.
Worn close to minimum

Wear indicator device
(mechanical) contacts
rotor .................. .. ......... (6) Further inspection
required.
Worn close to minimum
specifications ......... 1 ........ ( 7) Suggest replacement.
Worn to, or below minimum
specifications ......... B ............ Require replacement.
( 1) - Identify and repair cause of contamination prior to
replacing friction material.
( 2) - When reconditioning or replacing drums or rotors,
replacement of friction material may be suggested
depending on the severity of the grooves or ridges.
( 3) - Some vehicles use pads that are tapered by design. Refer
to specific vehicle application. If not normal, require
replacement of pads and correction of cause.
( 4) - Uneven pad thickness is normal on some vehicles. Refer to
specific vehicle applications.
( 5) - The pad wear indicator light may come on due to other
electrical problems.
( 6) - Explain to the customer that the purpose of the wear
indicator is to alert him or her to check for friction
wear. Wear indicators may be bent or broken. Therefore,
the friction material must be measured. The need for
friction material replacement is determined based upon
the conditions stated in this section. Periodic inspection
is suggested.
( 7) - When the part appears to be close to the end of its useful
life, replacement may be suggested.
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G SENSORS
See ACCELEROMETERS .
HOSES
HOSE 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.
Blistered ............... B ............ Require replacement.
Fitting threads damaged . A .. Require repair or replacement.
Fitting threads stripped
(threads missing) ...... A ............ Require replacement.
Incorrectly secured ..... B ................. Require repair.
Inner fabric
(webbing) cut .......... B ............ Require replacement.
Leaking ................. A ............ Require replacement.
Missing ................. C ............ Require replacement.
Outer covering is cracked
to the extent that
inner fabric of hose

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JEEP CHEROKEE 1988 Service Repair Manual is visible ............. B ............ Require replacement.
Restricted .............. A ............ Require replacement.
Routed incorrectly ...... B ................. Require repair.
�

is visible ............. B ............ Require replacement.
Restricted .............. A ............ Require replacement.
Routed incorrectly ...... B ................. Require repair.
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HYDRAULIC MODULATORS
NOTE: Many modulators can only be replaced as complete
assemblies. Whenever possible, replace the failed
component part. If replacement of the failed part is not
possible, then replace the modulator assembly.
HYDRAULIC MODULATOR 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.
Connector broken ........ A .. Require repair or replacement.
Connector (Weatherpack
type) leaking .......... A .. Require repair or replacement.
Connector melted ........ A ........ ( 1) Require replacement.
Connector missing ....... C ............ Require replacement.
Disabled ................ A .. Require repair or replacement.
Electrical failure ...... A .. Require repair or replacement.
External leak ........... A .. Require repair or replacement.
Housing cracked ......... B .. Require repair or replacement.
Inoperative ( 2) ......... A .. Require repair or replacement.
Internal leak ........... A .. Require repair or replacement.
Missing ................. C ............ Require replacement.
Terminal burned, affecting
performance ............ A ........... ( 1) Require repair or
replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
Valve stuck ............. A .. Require repair or replacement.
Wire lead burned ........ A .. Require repair or replacement.
Wire lead conductors
exposed ................ B .. Require repair or replacement.
Wire lead open .......... A .. Require repair or replacement.
Wire lead shorted ....... A .. Require repair or replacement.
( 1) - Determine cause and correct prior to replacement of part.
( 2) - Inoperative includes intermittent operation or out of OEM
specification.

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$JEEP CHEROKEE 1988 Service Repair Manual ��\ ��\ ��\ ��\ ��\ ��\ ��\ �� HYDRO-BOOSTERS NOTE: Hydro-boosters and hydr$

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HYDRO-BOOSTERS
NOTE: Hydro-boosters and hydro-electric boosters are combined.
HYDRO-BOOSTER 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.
Connector broken ........ A .. Require repair or replacement.
Connector (Weatherpack
type) leaking .......... A .. Require repair or replacement.
Connector melted ........ A ........ ( 1) Require replacement.
Connector missing ....... C ............ Require replacement.
Does not apply assist, or
inadequate assist ...... A .. Require repair or replacement.
Leaking ................. B .. Require repair or replacement.
Leaks fluid at fitting .. B ........... Require tightening or
replacement.
Leaks fluid at unit ..... B .. Require repair or replacement.
Leaks fluid from pressure
hose(s) ................ B . Require replacement of hose(s).
Leaks fluid into passenger
compartment ............ B .. Require repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Terminal burned, affecting
performance ............ A ........... ( 1) Require repair or
replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
( 1) - Determine cause and correct prior to replacement of part.
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HYDRO-ELECTRIC BOOSTERS (POWERMASTER)
See HYDRO-BOOSTERS .
IGNITION DISABLE SWITCHES
See SWITCHES.

Page 301 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual LATERAL ACCELERATION SWITCHES See ACCELEROMETERS . LEDS See BULBS AND LEDS . LENSES LENSE INSPECTION��\ ��\ ��$

LATERAL ACCELERATION SWITCHES
See ACCELEROMETERS .
LEDS
See BULBS AND LEDS .
LENSES
LENSE INSPECTION\
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Condition Code Procedure
Application incorrect ... A ............ Require replacement.
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.
Broken, affecting
performance ............ A ............ Require replacement.
Broken, not affecting
performance ............ .. ........ No service suggested or
required.
Cracked ................. A ............ Require replacement.
Discolored .............. A ............ Require replacement.
Leaking ................. A .. Require repair or replacement.
Melted, affecting
performance ............ A ............ Require replacement.
Melted, not affecting
performance ............ 2 ............ Suggest replacement.
Missing ................. C ............ Require replacement.
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MASTER CYLINDERS
MASTER CYLINDER INSPECTION\
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Condition Code Procedure
Brake fluid leaking from
rear of master cylinder
bore ................... B .. Require repair or replacement.
Brake pedal drops
intermittently ......... A ........... ( 1) Require repair or
replacement.
Fluid level low ......... .. ......... ( 2) Further inspection
required.
Internal valve failure .. A .. Require repair or replacement.
Master cylinder leaking
brake fluid internally . A .. Require repair or replacement.
Piston does not return .. A .. Require repair or replacement.
Ports plugged ........... A .. Require repair or replacement.
Rubber master cylinder
cover gasket distorted
and gummy .............. A .. ( 3) Require replacement of the
gasket.

Page 302 of 1378

JEEP CHEROKEE 1988 Service Repair Manual (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 a

(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

Page 303 of 1378

JEEP CHEROKEE 1988 Service Repair Manual missing ................ C .. Require replacement of missing
parts.
Threads damaged ......... A .. Require repair or replacement.
Th

Page 304 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affe

Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
(1) - Inoperative includes intermittent operation or out of OEM
specification.
( 2) - Determine cause and correct prior to repair or
replacement of part.
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ROTORS
Determine the need to recondition based upon individual rotor
conditions that follow. Friction material replacement does not require
rotor reconditioning unless other justifications exist. DO NOT
recondition new rotors unless they are being pressed or bolted onto an
existing hub. It is not necessary to replace rotors in axle sets.
However, when replacing or reconditioning a rotor due to the
conditions that follow, you may suggest reconditioning of the other
rotor on the same axle to eliminate uneven braking behavior.
Determine the need to replace based upon the individual rotor
conditions that follow. Reconditioning is defined as machining and
block sanding, or block sanding only. Block sanding is defined as
using 120-150 grit sandpaper with moderate to heavy force for 60
seconds per side. Always wash rotors after servicing or before
installing.
ROTOR INSPECTION
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Condition Code Procedure
Corrosion affecting
structural integrity ... A ........ ( 1) Require replacement.
Cracked ................. B ............ Require replacement.
Hard spots .............. 2 ....... Suggest reconditioning or
replacement of rotor according
to OEM specifications.
Lateral runout (wobble)
exceeds OEM
specifications ......... B ............ Require re-indexing,
reconditioning, or replacement
according to specifications.
Measured thickness is less
than OEM discard
specifications ......... B ............ Require replacement.
Rotor thickness is less
than OEM "machine to"
specifications but thicker
than "discard at"
specifications, and the
rotor does not require
reconditioning ......... 1 ........ ( 2) Suggest replacement.
Rotor thickness will be
less than OEM "machine to"
specifications after
required

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