Brakes - Shudder or Vibration
NUMBER: 05-001-05GROUP: Brakes
DATE: January 6, 2005
SUBJECT:
Brake Shudder or Vibration
OVERVIEW:
This bulletin involves installing brake pads, hub and resurfacing the rotors and checking rotor runout.
MODELS:
2004 (DR) Ram Truck (1500 Series Only)
NOTE:
This bulletin applies to 2004 vehicles built on February 25, 2004 and February 26, 2004 (MDH 0225XX and 0226XX)
SYMPTOM/CONDITION:
The vehicle may exhibit pulsation or vibration in the brake pedal and/or steering wheel when the brakes are applied. The condition is most noticeable at speed over 50 MPH but can occur at lower speeds.
DIAGNOSIS:
If a customer indicates that the condition is present and the vehicle was built on Feb.25 or Feb. 26, 2004 (MDH 0225XX or 0226XX), perform the Repair Procedure.
PARTS REQUIRED:
SPECIAL TOOLS/EQUIPMENT REQUIRED:
REPAIR PROCEDURE:
1. Inspect the front brakes for any signs of abnormal wear or damage. Repair as necessary.
2. Remove both front calipers adapters with the calipers attached, support and set aside.
3. Remove both front hub and bearing assemblies using the appropriate service manual procedures for 2 or 4 wheel drive.
4. Install both new hub and bearing assemblies with the appropriate part number listed in the Parts Required Section above.
5. Install the new front pads and anti-rattle springs with the appropriate part number listed in the Parts Required Section above.
6. Resurface both front brake rotors with a Daimlerchrylsler approved on-car brake lathe. If an on-car lathe is not available at the dealership, the rotor resurfacing must be sublet to a facility with an approved on car lathe.
7. Mark one wheel stud on each side with a dab of paint or suitable marker.
NOTE:
Wheel stud torque is critical to the success of the repair. the following procedure is intended to identify excessive rotor distortion which could be caused by improper wheel stud torque.
8. Install the wheel and pre-tighten the lug nuts in a cross pattern to: 70 Nm (50 ft. lbs.) then final tighten the lug nuts in a cross pattern to: 183 Nm (135 ft. lbs.) and mark the wheel at the same location as the marked wheel stud.
9. Set up a dial indicator to measure mounted rotor lateral runout. Place the dial indicator plunger against the inner machined rotor face, visible between the brake caliper and the front splash shield (Fig. 1). Rotate the wheel and tire assembly two turns and take runout measurement. If the measurement is less than .050 mm (.002 in.) no further action is required. If the measurement is greater than .050 mm (.002 in.) remove the lug nuts and relocate the wheel one stud clockwise, tighten the lug nuts as described in step 6 and check the runout again. Do not remove any brake parts. Repeat step 7 for each wheel location until you achieve the lowest mounted runout. Minimum mounted rotor runout will be achieved by moving the wheel, not the rotor.
1. Repeat the mounted lateral runout check for the other rotor.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE:
Disclaimer:
This bulletin is supplied as technical information only and is not an authorization for repair.