My 91 f250 w/7.3 dzl.,--My brakes (brake peddle) have been slowly going down,down,down,. Took it to the shop .adj., back brakes up, replaced front disc,mech.,said master cyl.,bad .replaced w/ new ??? peddle goes to floor ,bled 3/4 times,,ABS lite been on for years. anyone// thanks.

 

ABS system can leak too...check ABS "distibutor" (where the lines go in and out...you know the part I'm talking about) for leaks...if none outside, could be internal leak. seals worn out , etc. Don't rule out other leaks, recheck ALL components, front to back... cylinders, calipers, lines, everything. I have seen new/rebuilt master cylinders have bad internal seal, rare but does happen. Try different mechanic for second opinion. Kind of like going to more than doctor for diagnosis on serious stuff or potential surgery.

 

Hey Mylarky, thanks for the come back. I just read "a book on break fixin",!!! Your quote good as the book. I run across this same problem 3/4 yrs.,ago just can't remember what i done to fix ??? Let you know the out come ,,thanks.

 

Hey ,Bakersmith, i'm leaning toward a bad booster. When i hold the brake down then start the motor the peddle goes to the floor . Have clear fluid at all wheels. Thanks for come back.