I am working on a 2000 Ford F-150 5.4. 4x4 with 4 wheel disk brakes. ABS. And cruise control. The truck had no brakes. There was no leaks in the system and all calipers seem to work fine. I changed the master cylinder and still have the same problem. I bench bled the master cylinder before instalation then bled all brakes in the proper order until new fluid came out at all 4 wheels. Now I can pump a pedal up and it will hold but if I let off for more then 30 secconds its gone again. I changed the master cylinder again. Bled the brakes again and again and again and still the same. I am totally lost. Any imput would be appreciated. Thanks yet again for your help.
have the same problem?
Friday, May 31st, 2013 AT 6:04 PM