Grand AM L4-121 2.0L (1988)
Brake Pad: All Technical Service Bulletins
Brakes - Guidelines Concerning Noise
Bulletin Number:
88-5-13
Reference Number:
875006
Publish Date:
9/88
Subject:
DISK BRAKE NOISE - GUIDELINES CONCERNING NOISE
Models
Affected:
ALL MODELS WITH DISC BRAKES
The disc brake system used on vehicles today was designed and developed to meet many different but very strict requirements while providing an
optimum level of performance under a wide range of vehicle operating conditions. The design criteria includes government requirements, service life,
space limitations, noise level, heat transfer and cooling, stopping ability, pedal effort and feel, fade resistance and environmental effects.
The choice of brake pads is ultimately a balanced choice, but priority must be given to those criteria which affect braking performance under the Federal
Motor Vehicle Safety Standards. As a result, a certain amount of brake noise can result. The brake pads used on today's vehicle may cause an occasional
and intermittent high-pitched squeak or squeal when brakes are applied with light or moderate pressure. If the brake system is functioning correctly and it
is the judgement of the dealership's service department that the demonstrated condition is normal brake noise, the customer should be assured that this is
an operating characteristic of disc brakes and no repair should be attempted.
Efforts to eliminate completely the occasional and intermittent noises that are judged to be normal are frequently temporary. All brake noises should not
arbitrarily be considered normal however. They should be diagnosed as outlined in the appropriate model year service manual. An example of a similar
noise requiring corrective action is the constant high-pitched squeal that is emitted by the disc brake wear warning sensor when brake pads are
excessively worn.
