and make an informed decision about how to proceed.
BRAKES
SERVICE PROCEDURES REQUIRED & SUGGESTED FOR PROPER
VEHICLE OPERATION
Some states may have specifications that differ from OEM.
Check your local/state regulations. Where state or local laws are
stricter, they take precedence over these guidelines.
ACCELEROMETERS (G SENSOR OR LATERAL)
ACCELEROMETER INSPECTION \
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Condition Code Procedure
Broken .................. A ............ Require replacement.
Connector loose ......... A .. Require repair or replacement.
Loose ................... B .. Require repair or replacement.
Missing ................. C ............ Require replacement.
Out of position ......... B ....... Require re-positioning to
vehicle manufacturer's
specifications.
Output signal incorrect . B ............ Require replacement.
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ACCUMULATORS
ACCUMULATOR INSPECTION \
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Condition Code Procedure
Leaking ................. B ............ Require replacement.
Missing ................. C ............ Require replacement.
Pre-charge incorrect .... B ............ Require replacement.
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ANCHOR PINS
See BACKING PLATES .
ANTI-LOCK BRAKE SYSTEMS
NOTE: Anti-lock brakes are an integral part of the brake system. It
is essential that the anti-lock brakes function properly when
brake service is performed.
Anti-lock brake systems are commonly referred to as "ABS" and
will be referred to as "ABS" throughout these guidelines. Some ABS
components also function as part of a traction control system (TCS).
WARNING: When diagnosing and servicing high pressure components,
observe safety procedures and equipment requirements
established by the vehicle manufacturer to reduce the
possibility of serious personal injury.
NOTE: Intermittent electrical conditions are often caused by a loss
of ground, poor connection, or water intrusion into the
wiring harness.
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DIF FE R EN TIA L - D AN A T R AC -L O K & P O W ER -L O K
1988 J e ep C hero ke e
1988 Positive Traction Differentials - Dana Power-Lok &
Trac-Lok
Jeep
DESCRIPTION
The limited slip differential uses 2 sets of multiple disc
clutches to control differential action. Dana produces 2 types of
positive traction differentials. The Power-Lok 4-pinion differential
is a split-case type. The Trac-Loc 2-pinion differential is a single-
case type.
OPERATION
When one or both wheels are on a low-traction surface such as
snow, ice or mud, the friction between the clutch plates will transfer
a portion of the usable torque to the wheel with the most traction.
The wheel on ice or snow will have a tendency to operate with the
opposite wheel in a combined driving effort.
AXLE RATIO & IDENTIFICATION
To determine axle ratio, see DRIVE AXLE RATIO IDENTIFICATION
in this section.
LUBRICATION
NOTE: Always use special positive traction differential lubricant
as specified by manufacturer.
DIAGNOSIS & TESTING
DANA 2-PINION TRAC-LOK
1) Drive vehicle to thoroughly warm up lubricant in rear
axle. Place a piece of slick paper over a smooth formica board. Ensure
formica board is on flat and level floor.
Fig. 1: Exploded View of Jeep Single-Case Dana Trac-Lok Differential
