1966 cuda new single res leaks

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Anthony Beauchamp

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Joined
Apr 12, 2018
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Escondido, ca. north county sd
Cars a 1966 Plymouth barracuda. Put on a new master just go get it going around town. The bolt under the master leaks I’ve tightening it maybe one whole more turn. It’s tight but out the box leaks?

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Faulty part. Either get a new one, or, try to seal this one. Look at the casting real well to see if there is a crack. If it looks good, you could try some teflon tape around the plug, but, I think I'd get another one.
 
Faulty part. Either get a new one, or, try to seal this one. Look at the casting real well to see if there is a crack. If it looks good, you could try some teflon tape around the plug, but, I think I'd get another one.
Thank you Teflon tape fixed it but now my rpm goes up when I apply the brake sounds like a vacuum leak hoses a good start? Have you read about people rebuilding the brake booster?
 
Yup, sounds like the booster is bad. Is it the original one with the remote vacuum reservoir?
 
I have had a couple of new master cylinders like that leak at that plug. Some will aways leak. A master cyl from a 64 fury is the same but without the plug on the bottom. That is what I order now.
 
Ill send you my whole old 65 single pot MC... doesnt leak. PM me. Shi....your close enough to come and get it, Tustin.
 
NAPA on line shows the 64 fury master without the bottom plug. The push rod is the same as 66 barracuda and comes with the spring too.
 
FWIW I had exactly the same experience with the same type of MC from Rockauto. The supplied fitting for the bottom plug wasn’t even correct type!
I eventually used the fittings from the old MC and it took a number of efforts to get the thing not to leak. Furthermore, the lid leaks no matter what.
I’ve decided to convert to dual mc and matched distribution block to get past my concerns about brake failure.
 
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