Asked by Apr 15, 2015 at 12:30 PM about the 2004 Pontiac Grand Prix GT2

Question type: Maintenance & Repair

This happens often and I have read many creditable information on the web about anit-
lock brake systems and mine seem to do just as they are supposed to (grind and
pulsate). However, when I hit a bump in the road even when the road is dry or when
the road is wet I keep skidding and usually have to swerve to the side so I don't hit
anyone in the back. Yesterday I was going about 10 mph and was slowing down
coming up to a red light and they worked fine then all of a sudden "locked up" and the
car wouldn't stop, good thing the vehicle in the other lane was far enough for me to get
in (even though I cut him off). I have changed the pads on the front and still have to do
the back. I changed the rotor on the driver side as well. The brake dust builds up really
quick on that side.

6 Answers

Stanford Baddley

First of all, when you change brakes you do them in pairs. If you replace brake pads, you do both sides., If you replace rotors, you do both. Is your abs light on all the time? Have you checked the calipers and hoses? The caliper could be locking up, the brake hoses could be collapsing internally. Hope that helps.

1 out of 1 people think this is helpful.

I bought the car used in October, since then, had to change the brakes twice and were changed at the same time, however I had to change the driver side a third time. I have not checked the calipers or hoses so I will see about that today if the rain holds up. Thanks a bunch!

You might either check or have it checked your brake pedal switch cause I have noticed since I had mine replaced on my 2006 Trailblazer, that my brakes even seem to work better I know have better pedal and don't feel spongy... I hope this helps your problems too......

1 out of 1 people think this is helpful.

Here's a video of a typical system. As you can see, there are many things that can be malfunctioning. You may have a bad wheel sensor or a bad valve solenoid. It's a tough call. But like Stanford said, check all the basic parts first. You may have rusted slides or a piston may not be retracting after brakes are applied.

2 out of 2 people think this is helpful.

I'm agreeing with what others have posted. Accelerated pad wear which you most certainly have is very likely caused by bad calipers. I can't think of anything else that would cause that. Calipers are inexpensive and are a sensible replacement on an older car anyway. I've had similar brake failure issues at very low speed like you have. Check wheel bearings and possibly even axle shafts. Tolerances for the ABS system are very small. Bad bearings seem to throw things out of spec just enough send confusing messages to the computer and make the brakes operate a bit erratically. Both times when I replaced bearings and axles the problem went away.


It was the master cylinder - it went out....

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