Brakes - Selected Models with Revised Components
87buick14Bulletin: 88-5-4
Date: Dec., '87
Ref.No. 88-031-5
Corp. Ref. No. 875001R
SUBJECT: 1988 BRAKE SYSTEM CHANGES
MODELS AFFECTED: 1988 SKYHAWKS 1988 SKYLARKS
1988 Skyhawks and Skylarks beginning with the following vehicle identification numbers (VIN) at the assembly plants listed will be equipped with a different brake master cylinder, brake booster assembly and brake caliper assembly.
MODEL VIN BREAKPOINTS
Somerset/Skylark JM011292
Skyhawk JK409094
The changes to the brake system were incorporated to provide an improved pedal feel and increased booster assist on initial brake apply.
PARTS USAGE
The new caliper part numbers listed below must be used to service ALL 1988 Skyhawks and Skylarks, regardless of VIN.
The NEW brake booster and master cylinder part numbers listed in this bulletin MUST be used to service only those Skyhawks and Skylarks models produced, beginning with the VIN breakpoints provided.
NOTICE: Vehicles built prior to the VIN breakpoints MUST be serviced with the prior brake booster and brake master cylinder part numbers listed in this bulletin. Mixing the new booster and master cylinder parts with prior parts on early built (prior to VIN breakpoints) vehicles may result in a brake application requiring increased pedal travel to stop the car.
PARTS INFORMATION
1988 NEW 1988 OLD
PART NUMBER PART NUMBER
Caliper 18015752 (Left) 18011667 (Left)
18015753 (Right) 18011668 (Right)
Booster 18015498 (Code NT) 18013875 (Code LF)
Master Cylinder 18015760 (Code NT) 18014370 (Code D[.)
PARTS IDENTIFICATION
The new brake booster part number listed in this bulletin can be identified by the broadcast code "NT" printed on the bar code label which is attached to the part. See illustration, View A.
The new master cylinder part number listed in this bulletin can be identified by a broadcast code of "NT" stamped on the aluminum housing. See View C. The broadcast code of "NT" is also printed on the bar code label attached to the rear of the brake fluid reservoir, View B. The brake booster, master cylinder, and brake fluid reservoir MUST all have a broadcast code of "NT" on all vehicles built after the VIN breakpoints listed in this bulletin.
WARRANTY INFORMATION
When submitting a warranty claim, use existing labor operation and times.