One problem related to brake master cylinder has been reported for the 2008 Ford F-350. The most recently reported issues are listed below.
Cruse control switch on the brake master cylinder disintegrated, causing immediate loss of brake fluid and braking. Switch body appeared rusty, while the switch next to it on the master cylinder did not. Vehicle in motion, descending driveway when brake pedal went to the floor and all braking action was lost. Vehicle stopped via emergency brake.