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Old November 29th, 2006, 08:00 AM   #1
biohazardbill
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Default Wheel locks up when I press the brakes...

Passenger right rear wheel cylinder went bad so I replaced it. Driver side cylinder was replaced a month or so ago.

When I hit the brakes medium to heavy the pass rear wheel locks up and only that wheel.

WTF any ideas? I hate drum brakes

92 2500 GMC
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Old November 29th, 2006, 08:12 AM   #2
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Did the wheel cylinder leak? Did you clean the brake shoes & drum from any fluid that got on them? Did you re-adjust the brakes when you put it back together?
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Old November 29th, 2006, 08:20 AM   #3
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go in reverse about 30 mph and lock up the brakes, it will adjust them to the same.

I'm guessing you didn't make the spacing the same with the little adjustor thing when you swapped the cyulinder
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Old November 29th, 2006, 08:49 AM   #4
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I loosened the adjuster to be able to get the drum off, but did not adjust it when I reinstalled as I figured it would adjust itself in reverse as you said.

The wheel cylinder was leaking but if I didnt clean it good wouldnt that cause it to slip and not grab?
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Old November 29th, 2006, 08:51 AM   #5
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By the way I did the exact same thing to the driver side cylinder a month ago and have not had problems with it...
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Old November 29th, 2006, 11:32 AM   #6
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Bill with brake fluid or gear dope on the shoes it does the opposite of what you think it should do "IT Grabs" really well. I would pull the tire and drum to see if it is contaminated. The only other thing it could be is the shoes are on backwards. Either way you need to pull the drum to inspect.

Then when you put it together make sure the adjuster is free, put the drum on then manualy adjust the brakes until they just start to drag on the drum. Then do your reverse trick. It would take ALOT of reverse stops to adjust them that far.
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