96 Chevy PU Rear Drum Brakes

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LibbyChantel - 21 Apr 2006 23:48 GMT

It feels like the right rear is dragging sometimes when I put on the
brakes, usually when the truck is hot and has been driven for a while.
I pulled the drums off and the brake shoes are still good, but worn
substantially more at the top (where wheel cylinder is), and show signs
of not even touching the drum at the bottom. Is this bad adjustment, or
warped drums, or "normal"?

Thanks,
Libby

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sdlomi2 - 22 Apr 2006 00:12 GMT

> It feels like the right rear is dragging sometimes when I put on the
> brakes, usually when the truck is hot and has been driven for a while.
[quoted text clipped - 5 lines]
> Thanks,
> Libby

Libby it surely sounds like the drums need turning and shoes replaced.
Also, ensure they are in correct orientation, as some shoe-sets come with
one shoe shorter than the other. Don't remember whether short one goes in
front or rear--whoever machines the drums should know. s

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Shep - 22 Apr 2006 00:20 GMT

smaller lining to the ft.

>> It feels like the right rear is dragging sometimes when I put on the
>> brakes, usually when the truck is hot and has been driven for a while.
[quoted text clipped - 10 lines]
> one shoe shorter than the other. Don't remember whether short one goes in
> front or rear--whoever machines the drums should know. s

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LibbyChantel - 22 Apr 2006 00:48 GMT

I put a dial indicator on the drum that is giving trouble and it has
runout (out of round) of .030. Could this cause it? The brakes shoes
are put on correctly, secondary and primary.

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sdlomi2 - 22 Apr 2006 02:53 GMT

>I put a dial indicator on the drum that is giving trouble and it has
> runout (out of round) of .030. Could this cause it? The brakes shoes
> are put on correctly, secondary and primary.

Libby, 30 thousandths (.030) is quite a lot. Plus, if it's been hitting
only on top, that indicates they were probably run without their being
adjusted out properly. When replacing/turning, be sure new shoes are
adjusted properly. Caution PLUS my idea: adjust them *almost tight enough*
and drive it approx 100 miles. Then readjust properly. s

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LibbyChantel - 22 Apr 2006 02:51 GMT

Ok, bet I got it figured out. The self adjusters have not been working.
Consequently the pads are not expanded down at the bottom to contact
the drum. Thus, no wear on the pads except at the top where the wheel
cylinders are. I need to either manually adjust the brakes or persuade
the self-adjusters to start working.

What do you guys think, is this plausible? And with .030 and .014
runout respectively, should the drums be turned?

Thanks,
Libby

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sdlomi2 - 22 Apr 2006 02:55 GMT

> Ok, bet I got it figured out. The self adjusters have not been working.
> Consequently the pads are not expanded down at the bottom to contact
[quoted text clipped - 7 lines]
> Thanks,
> Libby

Yes, yes, and yes. s

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