update: So his passenger front brake caliper's piston seal boot thing has 2 tears in it, which I think was causing brake fluid to leak, therefore there was the loss in pressure. I changed his pads, since the person that bought it didn't even have a front pad on the passenger side.
I did run into a big problem, however. the caliper mounting bolts are T-60 Torx bolts, and they don't budge. We bought a bit for it, however when you put any torque on the bolt at all the bit cant stand the torque and the threads just bend and the bit is trashed.
I was wondering if heating the bolt and the mounting bracket around the bolt would help in loosening it? Any suggestions? I don't have a torch, but I could buy a propane torch if need be.
So I couldn't put on new rotors, and his one is really warped. I told him I would try to find some help or at least find an idea on what to do, and than we would work on them next week (since we don't want him to be driving on new pads and a warped rotor).
But at the moment he has stopping power. I also couldn't figure out how to get the seal off, but I am guessing someone makes a rebuild kit or something that has new seals. Eventually we need to do either a rebuild or buy a new caliper.
any suggestions would be greatly appreciated.