Question about Pontiac Grand Am
The Grand Am is notorious for brake problems and in particular has an issue with rotors that can warp after only a few thousand miles.
This produces a pulsating in the brake pedal and GM issued a technical bulletin to dealers numbered 00-05-23-002A instructing on the use of a brake aligning shim which is supposed to eliminate the problem.
However, from what you are describing it sounds that you may have a problem with a bad brake booster which is intermittently failing on the car. This should be looked at without delay and you should not drive the car until the problem is resolved.
With a properly functioning brake booster - with your foot on the pedal - start the car - you should feel a change in the pedal as soon as the engine starts.
If there is an intermittent problem with this booster on the mornings as you describe you may notice there is no change in the brake pedal when you start the car. In this condition there is no assistance to the brakes and it will be much harder to stop the car.
Obviously it is important to have these things checked out as soon as possible as the car is not roadworthy in this condition and it is dangerous to drive it.
Diagnosis: Failed Brake Booster.
Potential problems with rotors and or pads.
In my opinion brake work such as this should only be carried out by a qualified mechanic owing to the safety issues involved.
So best advice have the whole braking system looked at as soon as possible.
Posted on Aug 31, 2010
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Posted on Jan 02, 2017
SOURCE: Sometimes when I brake, usually
First off what is the year and model of the vehicle? There could be few reasons for this a problem with the ABS for instance. When was the last time the brakes were inspected or replaced?
Posted on Aug 30, 2010
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