Posted by casebro on Thursday, July 29, 2004 at 3:03PM :
In Reply to: M-37 Master cylinder pressure release posted by Storm S on Thursday, July 29, 2004 at 2:53PM :
If the pushrod won't allow the master to come back, it will hold the brakes on. Make sure you have some free play in the rod. If opening a bleeder releases the brakes, this is your problem.
Also, rotten old wheel cylinders will get so gunked up that they will not return- pedal pressure will push them out, but the springs won't pull them back. Releasing the bleeder won't help, you'll need to rebuild/replace the cyls.