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TSB 05-21-94

Premature Rear Brake Wear With 12" Rear Brake Drum

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Date: Oct. 21, 1994

This bulletin supersedes TSB 05-04-92A dated April 21, 1992 which should be noted in your files. The model years have been extended and both models now use the same brake shoe and lining kit.

Models: 1989 - 1993 (AD) Rain Pickup/Ram Cab & Chassis/power Ram cab & chassis

1993 - 1995 (AB) Ram Van/Wagon
1989 - 1993 (AD) Rain Pickup/Ram Cab & Chassis/power Ram cab & chassis

NOTE:   THIS BULLETIN APPLIES TO AB VEHICLES WITH A GVWR 8510 LB AND UNDER. THIS BULLETIN DOES NOT APPLY TO VANS WITH SCHOOL BUS PACKAGES OVER 8510 LB. GVWR.

THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH 12" REAR BRAKE DRUMS ONLY.

Symptoms:

Some vehicles equipped with 12" rear brake drums my exhibit premature wear of the rear brake lining.  

Diagnosis:

Verify the vehicle is equipped with 12" rear brake drums. Ensure the brake system is properly functioning as designed.

Parts:

1   4720191   Rear Brake Shoe and Lining Kit  

Repair:

This bulletin involves replacement of the rear brake linings with new revised linings.

VEHICLES EQUIPPED WITH 12"x 3" REAR BRAKE DRUMS

1.    Replace the rear brake shoe and lining. Refer to the appropriate Service Manual for brake drum & shoe removal and installation procedure. Resurface drum as needed to true surface. Refer to the appropriate Service Manual for the drum refinishing procedure.

VEHICLES EQUIPPED WITH 12"x 2.5" REAR BRAKE DRUMS

1.    Resurface the rear brake drum. Refer to the appropriate Service Manual for the brake drum refinishing procedure to accommodate the new revised brake lining (the new lining is 12' x 3"). Install the new revised brake lining.

NOTE:   WHEEL BEARING OIL SEALS AND AXLE SHAFT SEALS SHOULD BE REPLACED WHEN REFINISHING REAR BRAKE DRUMS..

POLICY:    Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:
Labor Operation No: 05-70-06-94     Shoe and Lining 1990-1995 (AB)
                                                          Assembly - Replace 1989-1993 (AD)
                                                          (12" x 3") . . . . . . . . . . . 1.5 Hrs.
                                  05-70-06-95   Shoe and Lining 1990-1995 (AB)
                                                         Assembly - Replace 1989-1993 (AD)
                                                         (12" x 2-1/211) . . . . . . . . . 2.5 Hrs.
                                   05-70-06-96 optional Equipment 1990-1995 (AB)
                                                         Dual Wheels 1989-1993 (AD) 0. 2 Hrs.

FAILURE CODE: P8 - New Part