View Single Post
Old 11-20-2017, 04:34 PM   #7
B. W.
Registered User
 
B. W.'s Avatar
 
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
Re: 1972 K20 Brakes - Need Help

Quote:
Originally Posted by 1972RedNeck View Post
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?
I don't know, one thing you could try is to remove one brake line from the master (the reservoir that is getting filled up), install a short pipe back into the master (just like you're bench bleeding).
Have a helper apply the brakes & look for fluid coming out of the disconnected brake line (this will turn on your brake light) - no fluid should come out, if it does then the combo valve is bad.
I know you pulled the switch & it was dry but, there are only two parts in the system that will allow one reservoir to go low & fill up the other, the master (you replaced) & the combo valve.
One more thought, the new master could be bad. What are the odds it would fail in the same way your old one did? Keep us posted.
B. W. is offline   Reply With Quote