Some 1986-1989 Riviera and Reatta vehicles may experience a condition of dash brake telltale light staying on, or remains off with parking brake set. This condition may be caused by a cracked brake switch.
To correct this condition replace the park brake switch with Part Number 3521242.
Parts are currently available from GMSPO.
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.