Brakes gettinghot and dragging

Rocketman · Sep 14, 2013

Scratching my head on this one. Drive around town for 20 minutes get out of town and notice a labor knock in motor and realize the brakes are dragging. Can't tell if caliburs are bad or if rubber return hose has collapsed. Someone told me at breakfast today that using a silicon based grease on the calibur pins would help them release when hot.

Any ideas?

67 coronet · Sep 14, 2013

you need to figure out why they are dragging.if you jack up the car and the brakes are dragging,undo the bleeder and see if they release.if they do,its a fluid presure issue.if they dont,its mechanical and try the lube trick.

Rocketman · Sep 14, 2013

67 coronet said:
you need to figure out why they are dragging.if you jack up the car and the brakes are dragging,undo the bleeder and see if they release.if they do,its a fluid presure issue.if they dont,its mechanical and try the lube trick.

they release when it cools down, they do not stay locked. I am thinking about just replacing the caliburs and hoses as it can't be than expensive

brasil · Sep 16, 2013

there can be different reasons.... Sticking caliper pistons.. collapsed hoses..... and "NO play " between the pushrod and the pistion in the mastercylinder... I had the No. 3 "reason" the former owner installed a new Mastercylinder without checking the "play " between the pushrod and the piston.... so my front wheels where dragging.. a little...but enough to destroy the pads and the discs...

Greetings Juergen

bob myers · Sep 17, 2013

I put a pinto front end in my drag car and used the original drum single master cylinder. After getting hot they would drag. I installed a residual valve in the front brake line and the problem went away. If yours is a disc conversion this may help.

Red63440 · Sep 18, 2013

You could also have moisture in your brake fluid, once its hot it expands, when it cools it contracts.

dodge41969 · Sep 18, 2013

Did you recently do a disc brake upgrade from a drum brake set up?, if you did...and kept the drum master cylinder it could be the residual check valve in the old master cylinder wreaking havoc. I found this out years ago after doing a disc brake swap on a friends '70 Road Runner...I left the manual drum master cylinder, because he didn't have money to change to a manual disc master, (I usually get one for a manual disc equipped '73-'76 A-body), well we went for a test drive and the brakes were dragging...and it got worse from there, then I remembered a friend of mine mentioned....eventually you'll run into that problem doing those swaps and keeping the drum master cylinder (the first time it happened). Swapped the master....end of problem.

Rocketman · Sep 21, 2013

Red63440 said:
You could also have moisture in your brake fluid, once its hot it expands, when it cools it contracts.

Odd you bring that up, my mechanic friend used the term "contaminated brake fluid"

- - - Updated - - -

dodge41969 said:
Did you recently do a disc brake upgrade from a drum brake set up?, if you did...and kept the drum master cylinder it could be the residual check valve in the old master cylinder wreaking havoc. I found this out years ago after doing a disc brake swap on a friends '70 Road Runner...I left the manual drum master cylinder, because he didn't have money to change to a manual disc master, (I usually get one for a manual disc equipped '73-'76 A-body), well we went for a test drive and the brakes were dragging...and it got worse from there, then I remembered a friend of mine mentioned....eventually you'll run into that problem doing those swaps and keeping the drum master cylinder (the first time it happened). Swapped the master....end of problem.

I did not do the install but I think the master cylinder and front disc were added at the same time, but I think it would be worth a call to the previous owner to be sure. I think the car was manual drum all they way around and he added the new master cylinder and front disc.

Rocketman · Sep 26, 2013

Solved the problem today, I think. There is an adjustable rod coming from the booster to the master cylinder that was not releasing enough to relieve the pressure. I adjusted it down and no more dragging brakes but now my pedal is somewhat softer that it was, I still have brakes but my confidence is them is not there due to the soft pedal

Brakes gettinghot and dragging

Rocketman

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67 coronet

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Rocketman

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brasil

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bob myers

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Red63440

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dodge41969

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Rocketman

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Rocketman

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