Bonneville V6-3800 3.8L Supercharged (1992)
Brake Rotor/Disc: Technical Service Bulletins
Warranty - Reducing Disc Brake Comebacks
Bulletin Number:
92-5-16
Reference Number:
235005R
Publish Date:
6/92
Subject:
REDUCING DISC BRAKE COMEBACKS (NEW TOOL KIT AND POLICY CHANGE)
Models Affected:
1992 FIREBIRD, BONNEVILLE, SUNBIRD GRAND AM, LEMANS, GRAND PRIX AND TRANS SPORT MODELS
POLICY CHANGE:
As of June 1, 1992 the add operation B (reface disc) on labor codes H0042, H0043, H0120, H0121 H0127, H0130, H0131 and H0137 will NOT be
paid.
EXPLANATION OF POLICY CHANGE
It has been found that:
1.
Rotor refacing is often done inaccurately resulting in increased comebacks.
2.
Rotor refacing during normal pad replacement is not necessary.
3.
Rotor refacing for cosmetic corrosion on new vehicles is also unnecessary. Clean-up of braking surfaces can be accomplished by 10-15 moderate
stops from 35-40 mph.
4.
Rotor refacing can often result in loss of brake effectiveness.
5.
Rotor refacing is also ineffective in correcting BRAKE SQUEAL, HIGH PEDAL EFFORT and/or PREMATURE LINING WEAR OUT, and
should not be used to address these conditions.
6.
When installing new rotors, it is unnecessary to reface the new rotors. Just a clean-up the braking surfaces with "Brake Kleen" or equivalent is
sufficient.
Additional brake information will be obtained by Delco Chassis from studying/inspecting the rotors returned under this new policy. PLEASE RETURN
ROTORS PER CORPORATE PARTS RETURN PROGRAM TO:
DELCO CHASSIS DIVISION - GMC
1435 CINCINNATI STREET
DOCK #4 - PP - C76
DAYTON, OH 45408-2668
SUGGESTED BRAKE SERVICE TECHNIQUES
PULSATION:
Caused by improper rotor turning, normal wear, extreme surface rust and improper torquing of wheel nuts. Initially, determine the front vs. rear brake
pulsation location using the service manual. (The following comments refer to front disc brake pulsation problems.)
Excessive lateral runout on brake rotors may be caused by distortion of the braking surface due to incorrect wheel nut torque or improper tightening
sequence. Index the wheels for correct repositioning. Remove the two front wheels and inspect the rotor/wheel interface for debris or rust and clean the
mating surfaces. Then retorque the wheel nuts in the STAR PATTERN sequence using the appropriate Torque Stick. Road test the vehicle. If the
pulsation is not corrected, replace the rotors.
NOTE:
To help reduce pulsation and assure correct retorquing of wheel nuts, Pontiac Division is releasing (June 1) a required tool kit (Kent-Moore P/N J39544)
that is designed to limit wheel nut torque levels if an impact wrench is used for wheel installation. This tool (sometimes called a Torque Stick) is not
applicable to LeMans. Any time this special tool is not available, a torque wrench MUST be used.
Use Labor Operation:
T3261 Wheel Removal and Torquing To Correct Pulsation (Front Only)
Labor Time:
.5
