Two problems related to lose power steering have been reported for the 2008 Ford F-250. The most recently reported issues are listed below.
When exiting the highway I lost the power steering and brakes. This happened multiple times over the course of several weeks. The vehicle would also lose steering pulling into parking spaces and under normal driving conditions. The brakes fade significantly under heavy use and while towing. The steering pump was replaced and the problem still has not gone away.
Slowing down to exit highway and lost all power steering and power brakes as if the truck shut off, but it was still running.