Would unequal drums cause a brake cylinder to not fully release? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-29-2007, 07:39 AM
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Would unequal drums cause a brake cylinder to not fully release?

Summary: R side front drum used to run hot and grab. After changing brake shoes, now L side front drum runs hot and grabs? Front drums do not have equal run out.

2 years ago I had a brake shoe go bad and render the brake drum unservicable as well on the passenger side of an all-drum '72 Ford F100. I replaced both of the front brake shoes, but only the passenger (R) side drum. The truck pulled to that side when braking, but more important to me the passenger side cylinder usually stuck and that wheel ran hot. About a year ago I switched the front drums by rotating the original drum to the R side and the newer drum to the L side (after reading that helped someone on this forum with similar situation). The R side cylinder still stuck and made the wheel run hot. Early this month the R side shoes wore out again so I replaced both sides' shoes.

Now the Driver (L) side grabs when braking, and runs hot because the cylinder is not fully releasing. I understand that by not replacing both drums 2 years ago I would have the brakes pulling, but I wonder if the unequal drums are also the source of the brake cylinder not releasing fully? Or is this problem likely caused by something else between the master cylinder and drums on the front?

I replaced the master cylinder and vacuum booster last summer cause they were leaking. No change then to which side grabbed ran hot.

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Old 03-29-2007, 08:36 AM
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A brake line can cause the wheel cyl. to not release. Jack up the wheel with the problem and see if you can spin it by hand, if you can't urn it or it has excessive drag, try loosening the brake line and see if it then rotates freely. If it does then the problem is most likely the rubber brake hose. Good luck Brian
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Old 03-29-2007, 07:47 PM
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Thanks for info. I will do the checks you suggested after work tomorrow, rebleed the line, and see if that either fixes it or I can tell where the flow may be fouled.
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