I have a 1999 Cadillac Escalade with 16,212 miles on it. The gas pedal sinks to the floor board whenever I stop or am stopped at a light. There are no grinding noises or squeaks. My car dealer informed me this morning that my front brakes are shot, ie, disc brakes, rotors, brake pads,etc...although the rear drums are fine. I was advised that this repair would cost $770.00 which seems excessive to me, especially on an SUV with only 16,212 miles on it that has been driven gently. I would appreciate any advice on this.