I took a look at my pads on the front of my yukon xl. They need replaced. The previous owner stripped the head out of the t55 torqs slide pin. I tried everything I could think of. Heat, not enough to melt the piston boots. I cut the head with a hacksaw and tried for 40 minutes to beat it with a 5 pound hammer and chisel attempting to get it to break loose. I disconnected the brake line and slid the caliper out and tried to heat it and turn the pin with a pair of vise grip. I used a large pair of channel locks to close the vise grips, so I thought that they had a good grip. But, they slipped right off. Any suggestions? I am picking up a new caliper tonight, but it would be nice not to pay $55 for a new one. - - - Updated - - - Oh, another question that I would like to get thoughts on. I was thinking that a gravity bleed would suffice when I change the caliper as I don't have anyone to pump the brakes to help me bleed them. Thoughts?