REAL BRAKE LIGHT ON DUE TO BRAKE PRESSURE MODULATOR

SUBJECT: RED BRAKE LIGHT ON DUE TO BRAKE PRESSURE MODULATOR VALVE LEAKS (TIGHTEN THE PRIME LINE HEX SET SCREW)

VEHICLES AFFECTED: 1993 "E AND K" MODELS

Some 1993 Eldorados and Sevilles equipped with traction control may experience a brake fluid leak from the Brake Pressure Modulator (BPM) valve prime line fitting. The brake fluid level sensor will turn on the red brake light when this occurs. This condition may be caused by the hex set screw inside the prime line fitting not being adequately tightened.

To correct this condition use the following procedure:

1. Remove brake fluid from the master cylinder reservoir to level below the prime line opening.

2. Disconnect the prime line from the brake pressure modulator valve. Drain the remaining brake fluid from the prime line.

3. Tighten the prime line hex set screw to 12 N.m (9 lbs. ft.) using a 4mm hex driver.

4. Reconnect the prime line to the brake pressure modulator valve.

5. Refill the prime line and master cylinder reservoir to the proper level with brake fluid.

6. Bleed vehicle per Section 5 of the Service Information Manual using the bleeder screw on BPM valve.

For vehicles repaired under warranty use:

Labour Operation: H2477

Labour Time: .2 hour plus .3 hour for bleed procedure

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.