im just throwing it out there, but have you checked the condition of the brake lines? a couple of months ago, i pulled my truck to the back of my grandfathers lot. when it came time to leave, i asked my girlfriend to move the truck out front, so i can close the gates and finish everything up. when i got up there, she said that the brakes didnt work, and that the pedal had gone to the floor, and she had to use the parking brake to stop. i figured 250,000 miles on it, i must need a new master cylinder, as i had just done a brake job (new pads, shoes, turned rotors and drums). took it to school, replaced the master cylinder in about an hour and a half, after bench bleeding it, and tried it. still went straight to the floor. after goin through about two quarts of brake fluid trying to bleed it, a friend noticed a large, growing puddle under the truck. i looked, and asked a friend to push the brake pedal. beside the front left wheel, i was squirted by brake fluid. i inspected the brake line, and found that the exhaust manifold had melted through one of the hard lines, and the fluid was spraying out, and hitting me. ordered the line, replaced the line, and all was fine! so, like i said, check all the lines, hard or soft. <img src="/forums/images/graemlins/kewl.gif" alt="" />