I have a 99 F350 Super duty, 4 wheel drive, V-10. Purchased the unit used and immediately had to do brake work on it as the brakes did not enough stopping power and the ABS light came on even after replacing the rear ABS sensor (there is only one ABS sensor on this truck). I replaced all 4 disk brake assemblies (pads plus new calipers from NAPA), bled repeatedly running two quarts of new DOT 3 synthetic fluid through the system. The old brakes were in bad condition - calipers stuck, pads worn, but the rotors were not significantly grooved and I did not replace the rotors. The brakes were somewhat better after this, but still wouldn't hold the truck well on a hill with a load and the ABS light still came on after driving about 1/10 mile. I left the truck sitting for a couple months during the winter here in Colorado, and when I went to use it the brakes went to the floor and only worked marginally after pumping them up a few times. Brake fluid level was full. So, I replaced the master cylinder with a Ford rebuilt cylinder from CarQuest, bench bled the new master cylinder before installing and ran another couple quarts of fluid through the system bleeding all four wheels (RR, LR, RF, LF). So now, the brakes are soft but are better, the ABS light STILL comes on, and now the brake light comes on, as if its out of brake fluid (brake fluid level is topped off). I think the brake fluid level float got bumped off track when I removed the reservoir and installed it on the new master cylinder, but poking a rod around the float area didn't correct the problem. How do you unstick this float? Also, brakes are still soft and I wonder if I got all the air out of the system - any ideas on how to bleed this system? Lastly, the ABS warning light has got me stumped - again, ideas are much appreciated. Thanks
John