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Old 08-24-2011, 01:51 PM   #1
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Default MOANING noise w/rear brakes on 05 Bonneville

Hello there! I hope someone can help me resolve the problem I have with my 2005 Pontiac Bonneville SE.

Every time I press on the brakes, it makes this loud moaning noise resembling a violin or a clarinet- not like metal rubbing metal. It seems to be a vibration of some sort?

At first it would take a little bit of driving before my brakes would make this noise, but now they moan with every stop/slow down.

My dad has replaced the brake pads and rotors, greased everything around, and it still continues to make the noise. It'* becoming quite embarrassing- people in the other cars look scared when I use my brakes. PLEASE HELP ME!
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Old 08-24-2011, 02:18 PM   #2
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Did he use any disc brake quiet? You apply it to the opposite side of each brake pad so they don't rattle and squeak.
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Old 08-24-2011, 02:27 PM   #3
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i had this issue and on mine it was a caliper mount bolt that did not get tigtened properly which made my caliper fly off and destroy the inside of my rim. remove the rear wheels and make sure that everything is tightend down properly
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Old 08-24-2011, 03:26 PM   #4
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X2 on check all the bolts, something is loose.
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Old 08-25-2011, 07:08 PM   #5
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He put the disk quiet on, and everything has been tightened correctly (caliper bolt).

It'* not a squeak or a rattle, and it doesn't sound like something is loose. It'* made this noise for the past year and a half, but it'* only recently become unbearable after he changed the brakes/rotors a couple weeks ago.

The noise is hard to describe, but it sounds like something is rubbing against something else... not like scratching and it doesn't make my car jiggle or move when I stop either.

Is there a different type of material used for brake pads that would be better? We tried the "cheapie" pads first, and now a set of the higher priced ones are still making the same noise.
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Old 08-26-2011, 10:38 AM   #6
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Make sure the assembly wasn't over-greased to the point where grease is migrating to the friction surfaces. Grease on the brake pads could cause a noise when braking. It could also cause your car not to slow down when braking. Your comment about "greased everything around" concerns me.

Also, check the sheet metal back plates (dust shields) behind the rotors to make sure they didn't get bent and are rubbing on the rotating assembly.

Check with your dad to make sure he cleaned and greased the caliper pins, and the holes they go into. These are the pins at the top and bottom of the caliper, and are removed to allow removal of the caliper assembly. They also allow the caliper to float sideways to compensate for pad wear.

Last, but certainly not least, while I do think brake jobs are within the capability of any back yard mechanic, if you can't resolve your issue I suggest you take the car into a shop and have a qualified mechanic look it over. Brakes are not something you want to have operating at anything less then peak performance. You don't want to find out the hard way that the noise you are hearing is related to something that might fail and cause loss of brakes.
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Old 08-26-2011, 10:42 AM   #7
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Oh, and by the way. the noise you describe could be completely unrelated to the brakes. Could be a bad wheel bearing or a bad c/v joint on the driveshaft.

Raise the car so the noisy wheel is off the ground, grab the tire at top and bottom and try to move it. Now grab it on each side and try to move it. If you sense movement side to side, you probably need a new tie rod end. If you sense movement in both directions you probably need a new wheel bearing.

Does the noise get more pronounced when you are turning? If so, is it louder when turning one direction versus the other? This is also a sign of a bad wheel bearing.
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Old 08-27-2011, 10:51 PM   #8
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Quote:
Originally Posted by 2kg4u View Post
Oh, and by the way. the noise you describe could be completely unrelated to the brakes. Could be a bad wheel bearing or a bad c/v joint on the driveshaft.

Raise the car so the noisy wheel is off the ground, grab the tire at top and bottom and try to move it. Now grab it on each side and try to move it. If you sense movement side to side, you probably need a new tie rod end. If you sense movement in both directions you probably need a new wheel bearing.

Does the noise get more pronounced when you are turning? If so, is it louder when turning one direction versus the other? This is also a sign of a bad wheel bearing.
Thanks for all the information! We'll check those things, and hope we can figure out what the heck is wrong!
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