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Old 11-14-2006, 11:58 AM   #1
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Default Slight brake grinding noise

My Dad'* Regal was making a grinding noise when the brakes are applied and there was some pulsation. I replaced both front rotors and pad (Wagner Thermoquiet), relubed the front caliper pins and the rear caliper pins. The pulsation is gone, but the grinding is still there. It only happens when brakes are applied (soft or hard). Otherwise, braking is fine. The old parts, front calipers and rear components all look normal to me.

Any thoughts? Should I replace the rear pads & rotors? What about the calipers (like I said, they looked OK).

Thanks.
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Old 11-14-2006, 12:02 PM   #2
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Any chance that the car hit a curb hard or anything else that could knock something out of alignment?

Does the grinding sound come from a particular wheel?
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Old 11-14-2006, 01:01 PM   #3
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Quote:
Originally Posted by driverjohn2005
Any chance that the car hit a curb hard or anything else that could knock something out of alignment?

Does the grinding sound come from a particular wheel?
I don't know whether a curb was hit. Would the noise only come when braking, though? Driving alignment seems to be fine.

I can't tell exactly where it is coming from, but I'll try to hear next time I drive it. I was thinking that the rear rotors may be warped?
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Old 11-20-2006, 09:33 PM   #4
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Quote:
Originally Posted by faisalmali
I can't tell exactly where it is coming from, but I'll try to hear next time I drive it. I was thinking that the rear rotors may be warped?
Grinding is usually some foreign material getting in between the pads and drums or rotors such as dirt or brake dust OR the pads are worn down the the rivets/metal. You can isolate it to the rears by using only the emergency brake to stop.
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Old 11-20-2006, 09:36 PM   #5
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i would also look into the possibility of one of the backing plates touching the rotors
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Old 11-20-2006, 09:39 PM   #6
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Quote:
Originally Posted by toastedoats
i would also look into the possibility of one of the backing plates touching the rotors
To clarify, this is the backing plate for the rotor, right?
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Old 11-20-2006, 09:41 PM   #7
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Quote:
Originally Posted by faisalmali
Quote:
Originally Posted by toastedoats
i would also look into the possibility of one of the backing plates touching the rotors
To clarify, this is the backing plate for the rotor, right?
correct, rotor or drum, whichever applies in this situation

can you confirm whether the sound is coming from the front or rear?
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Old 11-20-2006, 09:43 PM   #8
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yes, but to my thinking it would grind all the time if that were the problem.

I'm wondering if you might have a bad bearing that shows up during breaking because the weight of the car gets transferred forward
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Old 11-20-2006, 09:46 PM   #9
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Quote:
Originally Posted by popatim
yes, but to my thinking it would grind all the time if that were the problem.

I'm wondering if you might have a bad bearing that shows up during breaking because the weight of the car gets transferred forward
both are very reasonable options. very often a backing plate will only grind when the brakes are applied. Singscountry had a problem similar to this a while ago. I find it LESS likely to be a bearing due to the brake dependent symptoms, but still is very possible
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