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Re: 1972 K20 Brakes - Need Help
Quote:
Originally Posted by 1972RedNeck
Pulled the drums, the rear brakes look to be almost new. Pulled the rubber caps back on the wheel cylinders and they are dry as a bone.
Pulled the sender out of the proportioning valve and there is no fluid leakage there either.
Still can't get the master cylinder to bleed out.
Thoughts?
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Went through similar issues on my Javelin I ended up putting three master cylinders on it before I got a good one. I tore the two bad ones apart an found one of them had a deformed cup and the other one the anodizing on the plunger was flaking off and there were dozens of pieces preventing the cups from contacting the walls of the bore. Both were pulling air in from the back. I would pull the master cylinder apart and if you can't find an issue replace the rear hose and try again. Old hoses used to be good for twenty years. New hoses, good luck getting five years out of one.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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