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Old 11-11-2010, 09:51 AM   #1
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Default Brake Job issues

Hey guys. I really like the forum, although I have been lurking for a long time. Anyways I have come up with a question
Car is a 1995 Bonneville. I recently did a brake job and got lazy with the rears. The pads had tons of meat on them so I decided to just replace the drums. I adjusted the star wheel while I was in there. Pedal engaged sooner as did the parking brake. Anyways when I was all done I still have this horrible wobble from the rear. Wheel bearings feel good and I know it is from the rear by using the parking brake. I am trying to wrap my head around how the shoe could cause wobble? Maybe a high spot and what I feel is chatter?

Maybe I just got bad drums (I did buy the cheapies)

Do you guys think not replacing the shoe could cause wobble?
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Old 11-11-2010, 09:52 AM   #2
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Rotate your tires from the rear to the front. You may have a bad tire.
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Old 11-11-2010, 10:04 AM   #3
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I would take the tire off and make sure the drum is flush on the bearing. Being a little off set coudl cause an inbalence.
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Old 11-11-2010, 10:55 AM   #4
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I guess I need to clarify. The wobble or pulsation only occurs during braking. In the brake pedal.
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Old 11-11-2010, 12:13 PM   #5
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Drums brakes aren't known to cause chatter. I would check your front end and front brakes.
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Old 11-11-2010, 12:27 PM   #6
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I agree, drum brakes, unless something is broken don't do that. Front rotors however, are known to warp.
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Old 11-11-2010, 04:38 PM   #7
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I actually had the same problem. Turns out it was the wheel cylinder.
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Old 11-13-2010, 09:07 PM   #8
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you sure you didnt over adjust the rear and it has locked the rear brakes?
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Old 11-19-2010, 08:18 AM   #9
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One or both of the drums are out of round.

Be sure you do not over-torque the lug nuts after replacing the drums
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Old 11-19-2010, 08:34 AM   #10
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You can test for out of round drums by jacking up rear wheels and rotate by hand. A smooth even drag of the brakes indicates a good drum. An uneven, pulsing drag indicates a bad drum.

If you're real tight for cash, drums can be turned at an automotive machine shop. I have no idea what that costs these days. Back in the 1970'* it used to cost $10 each.

Warped disk brake rotors can NEVER be turned, as the entire mass goes out of alignment and they will quickly re-warp.
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