Have a '93 Honda Accord EX, 5 speed manual, ps, pb, ABS, air with 150K+. While driving and approaching an intersection, I applied my brakes only to have the brake pedal go to the floor. Pumping the brakes will not remedy the problem. This happened without warning (no dash signals, no brake squeeks). In diagnosing the brake failure, I have found the brake reservoir to be full, no leaks and no fluid on the ground. Also, if the car is not running, the brakes will pump up, however, when you turn the car off, the brake pedal will go to the floor. Any ideas?