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Old 08-04-2009, 06:15 PM
mcrosby mcrosby is offline
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F-250 Super Duty 7.3 brake (master cylinder?) problem.

Hey everyone, I did a search of the forum but didn't find too much. I hate being a new member and already asking a question, post #1, but I planned on making an end of summer trip this weekend with the family and without the truck it will be improbable.

Anyways, here's the problem. I replaced the brakes today, pretty simple, routine thing. After taking the truck off the jacks I found that the brake pedal went to the floor once the truck was started, they pumped back up after shutting the truck off and re-bleeding. But again, once starting they went straight to the floor.

After lots of searching and asking all the car-guys I know my options are 1)air in the system, 2) faulty master cylinder, 3) something to do with the ABS, or 4) a leak. I don't believe I have a leak, I've checked everywhere I could think, including all the power steering, etc that goes to the MC. I was told to try to get the ABS to come on because it may be stuck sliding everything past the MC or something along those lines but I'm not sure that's the problem. Any ideas?
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Old 08-04-2009, 06:30 PM
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ken kenmnedy ken kenmnedy is offline
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you probly got hydra-boost brakes check your power stearing fluid your power assist comes from there....if you pushed your brakes back away from your rotors with out cracking the bleader you could have big prob
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Old 08-04-2009, 08:49 PM
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Welcome to FTE. When you say you replaced the brakes, what parts does that include? Just pads? Rotors, calipers, slide pins? Is the fluid level going down any?

With the hydroboost system, a flush of the powersteering system is a good idea too. Remember it takes ATF not powersteering fluid. Many of us use synthetic ATF. Here's a link with instructions on the how to. http://www.superdutypsd.com/power_steering_flush.php
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Old 08-04-2009, 08:49 PM

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