I would think if the rim was so hot you couldnt touch it, it probly screwed up the caliper. I wouldnt say its the proportioning valve since the driverside is fine. Even though you have already done it I would replace the caliper and the rubber brake hose as Tag suggested. If the the caliper was that hot imagine how hot that rubber hose got. They collapse on the inside. Can't tell just by looking at it. You said it had happened before so I bet that hose got hot then too and made it weak. All because your first caliper was bad in my opinion. Good luck. <img src="/forums/images/graemlins/cheers.gif" alt="" />