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HELP brakes not releasing all the way

 
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dawg
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Joined: 10 Oct 2006
Posts: 449
Location: Colebrook Connecticut
15252.48 points



PostPosted: Sat Apr 21, 2007 11:49 am    Post subject: HELP brakes not releasing all the way Reply with quote

installed a complete drum disc conversion including lines
after install I had about 2inches travel in the pedal and brakes released fine.
first time out with the car the fronts wont release all the way.
I can turn them with a bit of effort but they seem to be dragging now and the pedal is hard and super sensitive.
on assembly i adjusted the booster rod to 5 3/4 inches to the clevis hole.
I used the new booster to M/C rod (short)
im also wondering if the combo valve isnt releasing the fronts?
all parts are brand new (that dont mean they are good though)
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beersngars
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Joined: 04 Feb 2006
Posts: 390
Location: Ohio
13369.80 points


1948 Chevrolet Coupe

PostPosted: Sat Apr 21, 2007 12:04 pm    Post subject: Reply with quote

First thing I would do is pump the pedal to get the fronts to get tight then open a caliper bleeder while trying to turn the rotor/wheel. If it releases, the problem is before the caliper. If not, be sure the pads are not just getting hot and causing it. Next I would recheck the pushrod length. There should be a bit of free play. If you have one of those adjustable prop valves, try readjusting it. Try these ideas and let us know what the results are.

Last edited by beersngars on Sat Apr 21, 2007 1:08 pm; edited 1 time in total
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beersngars
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Joined: 04 Feb 2006
Posts: 390
Location: Ohio
13369.80 points


1948 Chevrolet Coupe

PostPosted: Sat Apr 21, 2007 12:29 pm    Post subject: Reply with quote

One more question, does this only happen with the motor running?
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Paul P
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Joined: 15 Aug 2002
Posts: 2449
Location: Townsend, Mass.
83052.36 points


1971 Chevrolet Chevelle

PostPosted: Sat Apr 21, 2007 1:02 pm    Post subject: Reply with quote

I'd say that the residual pressure valve or combi valve is the culprit. I know you said you installed a complete conversion kit. Contact the manufacturer of the kit for sure they have seen this before and probably have the solution. Maybe they'll send you out another valve.

On one rare occasion I had a flex line on the front caliper act like a check valve. It would let fluid to the caliper and not let it back to the master. That was a weird one. I don't know how it happened I just replaced it.
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dawg
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Joined: 10 Oct 2006
Posts: 449
Location: Colebrook Connecticut
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PostPosted: Sat Apr 21, 2007 1:22 pm    Post subject: Reply with quote

never mind I found out the booster/master pushrod is 1/8 too long.
the brakes unstuck once i loosened the master cylinder
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Paul P
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Joined: 15 Aug 2002
Posts: 2449
Location: Townsend, Mass.
83052.36 points


1971 Chevrolet Chevelle

PostPosted: Sun Apr 22, 2007 7:55 am    Post subject: Reply with quote

Great news. It beats having to pull it all apart again that is for sure. thumbsup
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squeeezer
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Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Sun Apr 22, 2007 2:19 pm    Post subject: Reply with quote

sounds like a pushrod problem 100% to me

if it were a prop valve problem we all know the rears would lock up

since the calipers freed up after taking off the master what does that say?

just a suggestion:...im assuming the pushrod is not adjustable
take an old pushrod (engine) cut it in half and thread the inside use a 1/4 inch stud with a nut for adjustabilityaround 5.5inch to total length of 5.75 inch (your current length)

then see what works for you

good luck

this is how i do my (engine) pushrod length check
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