I have a 1994 Isuzu Trooper 4x4 in excellent condition. It has approx 95K on it and has been well maintained. I've had a recently-developing problem with an increasingly spongy brake pedal. When I step on the pedal, I get the feel that the system is engaging, but no real braking occurs until I get the pedal almost to the floor (about 2 inches from it - really, even with the accelerator, which is a BIG problem). The fisrt 3/4 of the brake pedal press, no significant braking really happens. The brakes have obviously been replaced a couple of times over the life of the car, but nothing has been done recently, and the pads are fine. No leaking fluids, etc. I'm not a mechanic, but can do some things on my own. Any suggestions/diagnosis, recommendations/help? Thank you!