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post #1 of (permalink) Old 12-01-2007, 05:22 PM Thread Starter
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Warped Drum???

I put my rear end back together friday and noticed that the break drum on one side seemed to be warped. Is this possible and if so how and why? Can it be fixed or should I replace it as I plan to, will it cause more damage if it isn't fixed or replaced, or can I just leave it as is? right now, it doesn't seem to affect anything other than a small annoying noise.
What should I do?
JD
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post #2 of (permalink) Old 12-01-2007, 05:36 PM
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Yes you can. And the best way to do it is being very hard on the brakes and then hitting water. Or sometimes you can be so hard on the brakes you can heat them up to the point where there soft and then a good hard push on the pedal will warp them. Like when you coming down a big hill and your on them to stop and when you get to that stop light you find your still going to fast so you hit them hard for that last sec. Both are mor of a rotor thing but can happen to drums. Less its Very bad for the most part all it will do is eat up that shoes on that side and you will feel a thump in the pedal when you stop.

88 YJ SOA2.5" 2"BDY Locked F/R Chevy 4.3 NVG241OR 4.56's 36x12.50
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post #3 of (permalink) Old 12-01-2007, 10:50 PM
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You may be able to minimize the effect by trying it in different positions on the axle. Put it on, try spinning it, put it on again one stud over.
You have 5 tries!
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post #4 of (permalink) Old 12-02-2007, 12:16 AM
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I'd try pulling it off, taking it to the local autozone or wherever and having them turn/resurface it. If they can't turn it and tell you that it is warped or otherwise unserviceable, replace it.
I've never heard of a warped drum but I suppose anything is possible.
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post #5 of (permalink) Old 12-02-2007, 02:53 AM
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Warped drums -
-- Caused by putting it on the axle off-center and it wears in a non concentric circle. (That's why sometimes you can find the position it was in.)

Since often the wheel holds the drum on, when changing a tire the drum can shift a little, then tightening the lug nuts holds the drum out of position, then it wears non concentric.

-- Also caused by not centering it properly on a lathe when refinishing it - which Autozone and those discount places are famous for! Would you have a tooth pulled by a hamburger slinger?
Take it to a real automotive machine shop - same price, but they'll do it right.

-- Can be caused by putting on the E-brake tight when the drum's real hot - as it cools down the E-brake warps it.

-- Poor quality/thin Chinese drums - available at AutoChina.
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post #6 of (permalink) Old 12-02-2007, 07:08 AM
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And how badly warped is it? It's not at all unusual to have one that will lightly touch a high spot on a shoe as it turns, which is of no consequence. If it's so bad that it will make maybe a half turn without dragging at all, but then you can't even turn it the rest of the way by hand, it's a problem.

Also make sure that the mating surfaces are clean. A chunk of rust can cause it to mount up crooked which will make it seem warped.

EVERYTHING's easy for the guy who doesn't have to do it.
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post #7 of (permalink) Old 12-03-2007, 01:03 PM
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My personal opinion....replace it....especially if it has more than 50K miles on it....the last time I bought a new drum it was about $30 at NAPA.

Brakes are one of those things I don't take short cuts on....besides, but the time you make a couple of trips to the machine shop...pull it off 2 or more times....the time and gas spent would pay for that new drum....

Just my opinion.....

BTW...all the above possible reasons for it being warped are correct....that is why I let the veh 'creep' a few inches every few seconds after making a 'hard' stop coming down a hill....

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post #8 of (permalink) Old 12-04-2007, 07:45 PM Thread Starter
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Thanks for the help. I took the wheel off and marked the lug bolt and drum. Then I started shifting it one lug at a time until the noise went away. now I have no noise or pulsating break pedal.I'll probably still replace it some time, but it looks good for now.
JD
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