Not real sure what single problem could have caused that... Strange. This may be a stupid question but have you checked the fluid in the powersteering? I'm jumping to conclusions here but could someone have sabotaged the truck just to mess with him? I know that technology has come a long way from the vehicles I'm used to working on but I think that the power brakes still use vacuum to do the boosting.
An easy way to check if vacuum is being applied to the break system is to turn the engine off. Then press and release the break pedal several times. Hold down the break pedal and then fire the engine. If the break system has a vacuum supply the pedal should go soft. If not then you need to run down the vacuum line.