One problem related to brake master cylinder has been reported for the 2009 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Ford F-150 based on all problems reported for the 2009 F-150.
While in motion, light came on brake fluid low. I took it to a mechanic, and we looked, but didn't immediately see any puddle, or sign of rapid loss of fluid, filled master cylinder back up, and drove 15 miles home. On the way, I noticed the pedal was spongy, when I got home, I looked, and had lost 1/4 of the fluid in the master cylinder. I got in the truck, pressed the brake pedal, felt it going down, got out, and saw it was leaking rapidly from a junction of the brake hose going from the master cylinder to the (abs box?) where it goes from rubber to metal. I got a new one from the dealer today dublin Ford, dublin GA. [$33. 00] and noticed that is has been much improved ofer the original. This tells me that Ford knew it had a problem, which should have been a recall item, and didn't recall for it. It also tells me that there are probably a bunch of f150's out there that are at risk of brake failure due to the failure of a $33 part.