[bobzdar]

Originally Posted by Baron Von Zeppelin

Are they old used calipers or new ? Or reconditioned ?

I recently went through a sort of similar episode with the rear disc calipers on my dads 04 Tahoe after doing front/rear brake pads.
Rears would get Hot on test drive. Really Hot

Turned out to be the calipers had bad spots or maybe gunked up deeper up inside the bores and would not retract properly in their new positions with new thick pads.
Had been rarely driven in the past 15 years before he bought it about a year ago with only 65k miles on it. Rear pads were originals and inboard pads were really thin.

Put the old pads back on and it did fine.
He said leave it - I said NO . lol

He didn't want new calipers , so I made a compromise that worked out.
... a whole 'nother story ...

Everything is new except the metal lines - I converted from drums to discs so it has new calipers, hoses, mc, booster and prop valve. I would suspect the metal line if only one wheel were sticking, but both makes me think MC or prop valve. I called up firebird central (which is where I got the mc, booster and prop valve) to see if maybe they sent me the wrong (drum/drum) prop valve and they don't even carry a drum/drum setup, so doubtful. It's really odd, and if everything wasn't new I'd start from the wheels and work my way back but I feel like it's up stream from that...