Originally Posted by 85GT-79FJ40

Did you compress the calipers with a C-Clamp and an old pad? Did any of them seem really hard to compress then like POP and go in? Have you looked CAREFULLY at all the calipers to make sure there are no leaks? You shouldn't have any problems with just a pad or pad/rotor change. BUT I have run into issues compressing caliper pistons on Toyota truck 4 Piston calipers more times than I can count over the years. I'm on my 17th toyota truck now and I also work on cars for a living. Although rarely toyota trucks... Mostly hot rods and muscle cars. If you compressed a frozen piston it will likely be leaking. And that will make the pedal go the floor and cause it to stop poorly of course. Occasionally you can have a similar issue with a master cylinder too. If there is grit in the bore of the cylinder and you compress the brake pedal further than usual you can chew up the seals in the cylinder and have a leak there. Usually they'll leak out the back when that happens.