Owner Notification, Change, Parts, Procedure Information

OWNER NOTIFICATION

Owners of vehicles involved in this campaign will be notified by Buick Motor Division (see copy of owner letter included with this bulletin).

CHANGE OF OWNER INFORMATION

Dealers are to use the Dealer Communication System (DCS) to provide Buick Motor Division with subsequent Buick owner information. By reporting a change of owner name or address of a vehicle in campaign status over the DCS, the need to send a CVAR form for that vehicle is eliminated. Terminal input instructions are covered in the DCS Manual under Section 9, Page 9-J01A and B.

PARTS INFORMATION

Parts are to be obtained through GMSPO using the following part numbers:

Description Part Number Quantity/Vehicle

Pressure Warning Switch 25530882 1 - As Required
Hydraulic Pump & Motor 25528401 1 - As Required
Pump Motor Relay 25525848 1
30 Amp Fuse 12004011 2

It is anticipated that most cars will require a pressure warning switch, but that less than 20% will require a hydraulic pump and motor. All cars will require relay and fuses. Please adjust your orders accordingly for the hydraulic pump and motor.

To ensure these parts are obtained as soon as possible, they should be ordered from GM Service Parts Operations (GMSPO) on a C.I.O. order, with NO special instruction code; but order on an Advise Code (2).

TECHNICAL PROCEDURE

1. Raise hood, install fender covers. Leave ignition key in OFF position. Disconnect battery cables from battery.

FIGURE 1 - RELAYS AND FUSES LOCATIONS:

2. Replace the ABS pump motor relay, and both the ABS pump motor 30 amp fuse and the ABS main 30 amp fuse. The pump motor relay will have four wires in its connector. Relay and fuses are located on the left front of dash behind the strut tower (see Figure 1).

CAUTION: Relay must be reinstalled on bracket with connector at bottom to prevent water entry. If relay bracket mounting is disturbed, bracket must be resecured to front of dash.
3. Visually inspect hydraulic pump and motor housing for any evidence of brake fluid seepage below the pressure warning switch. If any components require replacement, care should be taken to prevent brake fluid spillage.

A. If any evidence of brake fluid seepage is indicated, perform the following steps as outlined in the 1987 Buick Chassis Service Manual, pages 5E - 5 & 6. If no seepage is indicated, proceed to Step 3B.

1. Replace the hydraulic pump and motor.

FIGURE 2:

2. Inspect pressure warning switch for red plastic identification band (See Figure 2). If red band is observed, the switch requires replacement. If red band is not observed, the original switch should be transferred to the replacement pump and motor.

CAUTION: FAILURE TO FULLY DEPRESSURIZE THE HYDRAULIC ACCUMULATOR BEFORE PERFORMING SERVICE OPERATIONS COULD RESULT IN INJURY TO SERVICE PERSONNEL AND DAMAGE TO PAINTED SURFACES.
B. If there is no evidence of brake fluid seepage, inspect only the pressure warning switch for red plastic identification band (See Figure 2). If red band is observed, the switch requires replacement. Follow pressure warning switch replacement procedure in 1987 Buick Chassis Service Manual, page 5E-6. If red band is not observed, proceed to Step 3C.
C. If visual inspection does not indicate any parts replacement except for relay and fuses replaced in step 2, proceed to step 5.

4. If pressure warning switch is replaced, without pump and motor replacement; check fluid level in reservoir and ensure that it is filled to mark. Do Not overfill or underfill. Connect battery cables and turn ignition key to ON position until pump motor stops. Check for brake fluid leak.

NOTE: Use only Dot 3 brake fluid from a clean, sealed container. Do not use any fluid from a container which is wet with water. Use of Dot 5 silicone fluid is not recommended. Internal damage to the pump components may result.

If hydraulic pump and motor is replaced:

^ Fill reservoir with brake fluid. Connect battery cables.

^ Turn ignition key to ON position until pump motor stops.

^ Check for brake fluid leak.

^ Turn ignition key OFF and discharge accumulator. See Checking and
Filling in 1987 Buick Chassis Service Manual, Page 5E-4.

^ Ensure that the brake fluid reservoir is filled to mark. Do Not overfill or underfill.
5. Install a Campaign Identification Label

CAMPAIGN IDENTIFICATION LABEL:

Each label provides a space to include the campaign number, the five (5) digit dealer code of the dealer performing the campaign service, and the date vehicle was campaigned. This information may be inserted with a typewriter or ballpoint pen. When installing label, clean the surface of the radiator support tie bar and apply the campaign label where it is readily visible.
6. Connect battery cables if not previously connected in Step 4. Remove fender cover and close hood.