I just changed the rear brakes and rotors. I first used a C-Clamp to compress the piston but then realized you have to turn them (I used needle nose pliers). I was able to turn them a couple of times, put them back on, depressed the brake, then turned it a couple of times more. They turned fairly easily, so I don't think I stripped the thread (if that's how the calipers are nowadays). I did both sides. Now, as before, I just drive around the block, press the brakes a couple of times and the rotors are extremely hot (to touch). Is this normal? Or should I buy new calipers? The fronts are the same, very hot. They are not wearing excessively by any means, but the previous rotors were warped, I think. The car is a 2000 Buick LeSabre with 80,000 km on it.
Thanks in advance,