Dust shields were removed from front brake assemblies due to engineering studies that have shown dust shields are not necessary and removal of dust shields can improve brake rotor cooling.
KNUCKLE PART NUMBERS FIRST VIN SEQUENCE NUMBER ASSEMBLY AFFECTED WITH SHIELDS REMOVED -------- ------------ -------------------------- Front Left 21011101 NZ109668 Front Right 21011102 NZ109668
CORRECTIVE ACTION: If one of the dust shields becomes damaged on 1991 or 1992 vehicles, repair or replacement is not necessary. Remove the damaged dust shield and the dust shield from the other side, to maintain balance and symmetry. If a new front knuckle assembly is installed, remove the shield from the other front knuckle assembly to maintain balance and symmetry.
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.