Hi, Im working on a ford f350 dually, I have a good brake pedal untill I start the truck then it goes to the floor, I have tried 5 master cylinders, 2 have been from ford, two brake boosters, 1from ford, not rebuilt, new hoses, new calipers, new ford pads, new vacume pump, 25 points of vacumme, new rabs valve new rotors and drums, new rear wheel cylinders, rear brake hose, I have searched all over for leaks, no leaks, the problem is in the front brakes, I blocked the rears completly off, I have bleed about 4 gallons of brake fluid threw the system, nothing seems to help this truck, I am a mechanic, been to alot of different schools, but this one is beyond me, Ive also pinched the brake hoses to the front and the pedal feels fine, thought it was calipers so have put two diffrent sets on besides orginal, have plugged rear brakes completly off, acts like master cylinder but out of 5 and 2 new ford oem I cant see that. But I guese anything is possible, any advice would be appreciated. Thanks Gary
have the same problem?
Monday, December 10th, 2007 AT 7:01 PM