BRAKE SQUEAL (NEW FRONT BRAKE LINING MATERIAL AVAILABLE)

SUBJECT: BRAKE SQUEAL (NEW FRONT BRAKE LINING MATERIAL AVAILABLE)

VEHICLES AFFECTED: 1990 U-VAN

CONDITION:

---------- Some 1990 U-vans may experience a high pitched squeal coming from the front of the vehicle during light to moderate brake applications. The squeal may be more noticeable during warm weather or periods of heavy brake usage.

CORRECTION:

----------- A new front brake lining material composition is now available that may help reduce this brake squeal. The new material entered production with the VINs listed below:

Chevrolet LT155494 Oldsmobile LT315560 Pontiac LT228373

Rotors should be inspected and refinished ONLY if required.

During routine brake maintenance such as pad replacement, DO NOT refinish disc brake rotors unless:

1. There is brake pulsation present, and the pulsation is determined to be caused by the rotors, or

2. The rotors are excessively scored. Light, surface scoring that does not exceed 0.4mm (0.015") should not affect brake operation.

PARTS INFORMATION:

Lining Kit: CANSPO - P/N 18018251

A/C Delco - Delco Moraine P/N 18017937 Catalogue # 171-483

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.