V 3500 P/U 4WD V8-350 5.7L VIN M 4-bbl (1987)
Brake Caliper: All Technical Service Bulletins
Brakes - New Front Brake Calipers Available
GMC NUMBER:
88-T-196
GROUP:
5 - Brakes
DATE:
March, 1989
CORPORATE
NUMBER:
865016R
SUBJECT:
NEW FRONT BRAKE CALIPERS AVAILABLE
MODELS:
1984-86 C 1,2,3, 1987-88 R 1,2,3, AND 1984-88 G 1,2,3
New front brake calipers for the models listed above are now available from GMSPO. These new calipers have smoother bore finishes. If caliper
replacement is being considered to correct a braking induced directional lead (either right or left) the following inspections and procedures should be
performed. Evaluation of a vehicle's brake performance is not intended to be made with the vehicle operator's hands removed from the steering wheel.
Vehicles that exhibit directional bias under these conditions are not considered to exhibit brake lead. Before road testing the vehicle, perform the
following services:
Preliminary Inspection
^
Inspect tires for excessive, uneven wear - replace if necessary.
^
Equalize tire pressures.
^
Equalize parking brake adjustment.
^
Adjust rear service brakes to .030" running clearance.
^
Check and, if necessary, adjust the front end alignment including toe.
^
Inspect caliper brake line bolt (# 34, page 5A8, Figure 4, 1988 Service Manual X-8832) for proper locations of orifice. The orifice should be
located in the unthreaded part of the bolt. If the orifice is located in the threaded portion of the bolt, then the bolt must be replaced.
IMPORTANT:
After the preceding inspections and/or adjustments have been made, the vehicle should be road tested to verify is a lead still exists.
Vehicles that lead may lead either right or left when the brakes are applied.
Make all stops on a dry, level (no crown), clean roadway.
Each applicable step must be thoroughly completed to effect a lasting repair. Failure to complete the procedures exactly as written
may result in an unsatisfactory repair.
Parts are currently available from GMSPO.
Parts Information
Old Caliper
New Caliper
Brake System
Part Number
Part Number
JB1 & 3
18012308
LH
18015427
LH
18012309
RH
18015428
RH
JB5 & 6
18007947
LH
18015383
LH
18007948
RH
18015384
RH
JB7
18009753
LH
18015385
LH
18009754
RH
18015386
RH