For 1990-2009 cars

# DIESEL HYDRO BOOST BRAKES SPOOL VALVE SEAL INFORMATION

THE SPOOL VALVE SLEEVE SHOWN IN FIG. 5-44 ON PAGE 5-55 OF THE 1982 CHASSIS SERVICE MANUAL IS USED WITH CUTLASS SUPREME AND TORONADO MODELS WITH HYDRO-BOOST BRAKES ONLY. THE PURPOSE OF THE SPOOL VALVE SLEEVE IS TO LIMIT THE PRESSURE TO THE CALIPER TO APPROXIMATELY 2300 PSI. PRESSURE MUST BE LIMITED TO THE SMALLER CALIPERS USED ON CUTLASS SUPREME AND TORONADO MODELS TO PREVENT DAMAGE TO THE CALIPERS.

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.