Brakes/Suspension - Pedal Pulsation/Steering Shimmy

Number:
00-02

Group:
46

Date:
Feb.17, 2000

Subject:
Pulsation in Brake Pedal and/or Shimmy in Steering Wheel When Brakes are Applied

Model(s):
All

Condition:
Brake pedal pulsation when braking, steering wheel shimmy when braking may be influenced by the following factors.
^ Suspension components (ball joints, bushings, tie rods, etc.)
^ Brake rotor/hub run-out / Brake rotor thickness variation

Service:
Check suspension components (control arm bushings, front struts, ball joints, tie rods, etc.) for wear.

If components check OK and rotor/hub runout is found:
Resurface rotors using the RTI BRC4O on-the-vehicle brake lathe.

Note:
RTI BRC40 on-the-vehicle brake lathe is available from Equipment Solutions.

Brake rotors, resurfacing with on-the-vehicle brake lathe
- Remove front wheels.
- Measure rotor thickness (must be of sufficient thickness to allow resurfacing without going below minimum specification set in Repair Manual).
- Mark (index) hub & rotor with a center punch.
- Remove brake calipers (Remove/installing calipers, see Front brakes servicing in the appropriate Repair Manual).
- Remove rotor and clean hub to rotor mounting surfaces, reinstall rotor (line up index marks).
- Clean brake caliper mounting points.

Note:
Illustration is used for reference to procedure only Actual suspension view may differ from what is shown.





- Install on-the-vehicle brake lathe.
- Resurface rotor.

Note:
NEVER! resurface rotors below minimum specifications (wear limit)

- Remove brake lathe.
- Repeat procedure to other rotor.
- Install front brake calipers.
- Install wheels (lug bolt torque 12O Nm (89 ft. lbs).

When procedure applies to vehicles within the New Vehicle Limited Warranty, use the following:

Part Identifier: 4650

Labor Operation:
Reface on vehicle 4650522 150 TU