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Old 11-08-2011, 07:40 PM
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chevy rear drum lock up problem

I'm driving an 86 chev c10. I had a spring break on me in the rear right drum. I replaced the springs in the drum.
Then My rear passenger tire started locking up on me and I ended up changing the rear wheel cylinder and a section of break line.
Now my problem did go away for a while but now it's starting up again only a couple weeks later. The wheel locks, but after dragging it a couple feet it frees up and all is good. I only have a couple thoughts about it:
1. would putting in the tension bar(adjustment screw with the wheel on it, it's at the bottom and sits between the shoes) the wrong way(I'm pretty sure it's right though) or tightened the screw/wheel in too far on the adjustment. I think I put it in almost all the way in but made sure it spun free and put some anti on the threads.
2. or Could it be air in the brake lines causing it(I did bleed them) maybe not well enough
3. or what else could it be, doesn't make any noise stopping is fine, it just locks up sometimes when you go from sitting a couple hours.

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Old 11-08-2011, 07:50 PM
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Were the shoes contaminated with brake fluid from the wheel cylinder, or perhaps with gear oil from a leaking axle seal?

What were the weather conditions like when it locked?
Our '97 Ranger delivery truck's rear brakes get extremely "grabby" when it's wet outside. Purposely dragging the brakes for a couple of hundred feet to get them warm and dried out seems to be the "quick fix".

(Yes, it's behaved this way from new. Ford dealer claims it was "normal" for these trucks to do that.)
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Old 11-08-2011, 09:51 PM
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yeah I don't think mines normal, cause it never used to do it.
I'm sure the pads were kept clean though.
I don't think it's the drum or it'd keep doing it till the pad wore free. And it's a new drum
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Old 11-10-2011, 06:54 AM
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Quote:
Originally Posted by devilsgotme
yeah I don't think mines normal, cause it never used to do it.
I'm sure the pads were kept clean though.
I don't think it's the drum or it'd keep doing it till the pad wore free. And it's a new drum


Then, the lining still might be contaminated or - did you reassemble it incorrectly. The short lining shoe always goes on the front with self energizing brakes and is often a different, softer material.

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Old 11-10-2011, 04:00 PM
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If the wheel cylinder was leaking enough to make the brakes grab the shoes are contaminated and need to be replaced, you will never get the fluid out of them. As soon as they get hot the fluid will start to come out.
You may also have a cylinder that is leaking again. The 8 dollar wheel cylinders are known not to last due to the poor quality parts and machining.
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Old 11-10-2011, 04:20 PM
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Or , the rear brake hose is collapsing internally...

dave
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Old 11-10-2011, 05:12 PM
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It is a new drum. Did you completley clean the cosmoline off of it, before running the drum. That would defenitly cause the trouble
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