SERVICE MANUAL UPDATE SEC. 5-PROPORTIONER VALVE

This bulletin is being reprinted because the models affected were not specified. Please discard DSIB 90-I-50.

Please update your 1989-1990 DeVille and Fleetwood Service Information Manuals, Section 5E, to include the following procedure to remove and inspect the proportioner valve.

PROPORTIONER VALVE

Remove or Disconnect:

1. Depressurize hydraulic accumulator. Refer to "Depressurizing Hydraulic Accumulator" in this section.

CAUTION:

Failure to depressurize the hydraulic accumulator prior to performing this operation may result in personal injury and/or damage to painted surfaces. Refer to CAUTION on page 5E-1.

2. Raise vehicle. Refer to "General Information" in Section OA.

3. Brake feed line from proportioner valve and plug.

4. Outlet pipes to rear wheels and plug.

5. Proportioner valve.

Install or Connect:

1. Proportioner valve to outlet pipe.

2. Brake feed line to proportioner valve. Adjust brake line clearances per Figure 1. Tighten brake lines to 15 N-m (11 lb. ft.).

3. Fill fluid reservoir. Refer to "Checking and Filling Brake Fluid" in this section.

4. Bleed brake system. Refer to "Bleeding Brake System" in this section.

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.