The rear axle consists of a knuckle, rear hub, unit
bearing. The unit bearing is press-fitted to the rear
hub and bolted to the knuckle. Also, the unit bearing
utilizes the same type of double row angular contact
ball bearing as does the front axle.

ABS rotor for detecting the vehicle speed is located
on the hub assembly, and a speed sensor is located
on the knuckle.

REAR AXLE DIAGNOSIS

INTRODUCTION TO REAR AXLE DIAGNOSIS

M1271004100168

Noise from the rear axle may be caused by defects in
the components.

REAR AXLE DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1271004200165

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find a
rear axle fault.
1. Gather information from the customer.

2. Verify that the condition described by the

customer exists.

3. Find the malfunction by following the Symptom

Chart.

4. Verify malfunction is eliminated.

SYMPTOM CHART

M1271004300162

INSPECTION PROCEDURE 1: Abnormal Noise

DIAGNOSIS

STEP 1. Check the wheel nut for looseness.

Q: Are the wheel nuts loosened?

YES :

Tighten the nuts, then go to Step3.

NO :

Go to Step 2.

AC001179 AB

KNUCKLE

CAP

ABS ROTOR
<VEHICLES WITH ABS>

OIL SEAL

UNIT BEARING

REAR HUB

SYMPTOM

INSPECTION PROCEDURE

REFERENCE PAGE

Abnormal noise

P.27-2

SPECIAL TOOLS

TSB Revision

REAR AXLE

27-3

STEP 2. Check the wheel bearing for wear or
damage.

Q: Is the wheel bearing in good condition?

YES :

Go to step 3.

NO :

Replace the part, then go to Step 4.

STEP 3. Check the brake disc for bent or
distortion.

Q: Is the brake disc in good condition?

YES :

Go to Step 4.

NO :

Replace the part, then go to Step 4.

STEP 4. Check trouble symptoms.

Q: Are any noises generated?

YES :

Return to Step 1.

NO :

This diagnosis is complete.

SPECIAL TOOLS

M1271000600536

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB990767
End yoke holder

MB990767-1

Hub fixing

MB991618
Hub bolt remover

General service tool

Hub bolt removal

MB991248
Inner shaft remover

Tool not available

ABS rotor removal

MB991897
Ball joint remover

MB991113-1,
MB990635-01 or General
service tool

Ball joint disconnection
NOTE: Steering linkage
puller (MB990635 or
MB991113)is also used
to disconnect knuckle
and tie rod end ball joint.

B990767

MB991618

MB991248

AC106827

ON-VEHICLE SERVICE

TSB Revision

REAR AXLE

27-4

ON-VEHICLE SERVICE

WHEEL BEARING END PLAY CHECK

M1271000900195

1. For vehicles with rear disc brakes, remove the caliper

assembly, suspend the caliper assembly with a wire and
remove the brake disc.

2. For vehicles with rear drum brakes, remove the brake drum.
3. Check the bearing's end play.

Place a dial gauge against the hub surface; then move the
hub in the axial direction and check whether or not there is
end play.

Limit: 0.05 mm (0.002 inch)

4. If the play exceeds the limit value, replace the rear hub

assembly.

REAR HUB ROTARY-SLIDING RESISTANCE
CHECK

M1271001100136

1. For vehicles with rear disc brakes, remove the caliper

assembly, suspend the caliper assembly with a wire and
remove the brake disc.

2. For vehicles with rear drum brakes, remove the brake drum.
3. After turning the hub a few times to seat the bearing, wind a

rope around the hub bolt and turn the hub by pulling at a 90
degree angle with a spring scale. Measure to determine
whether or not the rotary-sliding resistance of the rear hub is
at the limit value.

Limit: 18 N

⋅m (13 ft-lb)

4. If the rotary-sliding resistance exceeds the limit value,

replace the rear hub assembly.

HUB BOLT REPLACEMENT

M1271001000128

Required Special Tools:

• MB990767: End Yoke Holder

• MB991618: Hub Bolt Remover

1. For vehicles with rear disc brakes, remove the caliper

assembly, suspend the caliper assembly with a wire and
remove the brake disc.

2. For vehicles with rear drum brake, remove the brake drum.

AC001180

AC001181

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