AJ/FormS said

Ima calling it a bad wheel cylinder.
But just to be sure disconnect the self-adjuster cable and apply the brake again. If the one piston is still lazy, I think that confirms it.
What I cant figure out is why, if you opened the system to replace one WC, you didnt pop them all open for inspection. I have a feeling you would have replaced the rest of them too. For what they're worth I would have,or,at least honed them and kitted them.
All the best to you

Click to expand...

SGBARRACUDA said

A bad, collapsing brake hose can cause a brake not to release also.

Click to expand...

AJ/FormS said

I was thinking the same thing.

I had one in the shop that did the very same thing, on a front disc. A hard stab, and it wouldnt release. A second softer.slower appication, and it reverted to normal.
Its hard to imagine this on the rear though where there are two brake cylinders on the same flex-hose.

Just curious , did you polish off the rust on the shoe,bearing pads?

Click to expand...