Lumina L4-151 2.5L (1991)
Brake Pad: Customer Interest
Brakes - Noise/Pedal Feel, Effort/Reduced Lining Life
Number: 93-137-5
Section: 5
Date: MARCH 1993
Corporate Bulletin No.: 335003
ASE No.: A5
Subject:
BRAKE PAD LIFE, BRAKE NOISE, OR BRAKE PEDAL EFFORT
Model and Year:
1990-93 LUMINA
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 92-207A-5, DATED AUGUST 1992. THE PROCEDURE
HAS BEEN REVISED. ALL COPIES OF 92-207A-5 SHOULD BE DISCARDED.
CONDITION:
Some owners of 1990-93 W-cars may express concern with:
1.
Brake Noise
2.
Brake Pad Life
3.
Brake Pedal Feel/Effort
CAUSE:
These vehicles are equipped with 4-wheel disc brakes. Some light brake squeal is NORMAL. 4-wheel disc brakes also typically have a firmer pedal feel.
A cause for pedal effort or lining life concerns could be improper rotor finish. If the vehicle has had brake service which included rotor turning, that may
be the cause.
CORRECTION:
A.
Pads
Increased pad life AND lower pedal effort may be obtained by replacing both the front and rear original pads with the new 1993 pads.
Front Lining - P/N 12510029
Rear Lining - P/N 12510030
Note:
SOME BRAKE SQUEAL IS NORMAL
While the 1993 pads may result in an increase in pad life, and lower pedal effort and better feel, they may also be associated with higher levels of
brake squeal at the beginning of brake apply ("Tip-IN" squeal), or at the end of brake apply ("Pinch-Out" squeal).
For servicing a vehicle where pedal feel/effort, rather than pad life is the primary concern, GMSPO will still carry the linings listed below. These
linings are more aggressive and will reduce pedal effort even more. But, owners should be told that some "GRINDING/GROWLING" type noise
is to be expected from these and is NORMAL. DO NOT USE AS A GENERAL REPLACEMENT PART.
Front Lining - P/N 18019507
Rear Lining - P/N 18019508
RECOMMENDED SERVICE BRAKE SQUEAL
DO NOT TURN ROTORS OR SAND PADS FOR BRAKE NOISE CONCERNS.
While this may temporarily reduce some brake squeal, it may also reduce brake effectiveness and/or pad life.
BRAKE SQUEAL is caused by vibration of brake components. Some intermittent brake squeal is NORMAL. Usually 3-4 aggressive stops will
temporarily reduce or eliminate most brake squeal. If this does not work, remove, index (rotate wheel one (1) wheel bolt), and remount the wheels and