Brake pedal issue

[xenocath]

lately I have been having a slight issue with my brake pedal, it randomly gets really stiff to depress while driving and will stay that way until I turn the truck off but then it goes back to normal and will stay that way until it randomly does it again. could be 100 miles down the road or two miles, could be a few days between issues or minutes. the brakes still operate and stop the truck.
any one ever have an issue like this?

 

[cucvrus]

Brake booster failure. How is the steering? It must be fine or you have mentioned it.

 

[xenocath]

steering is fine so far just the pedal issue atm

 

[cucvrus]

Brake booster. Autozone lifetime warranty. Easy to install. Only really special tool is a 15 mm swivel socket. If you have that you are good as gold. Change the power steering fluid while you are at it. About 2 quarts. Use power steering fluid NOT ATF. Like the Old Gunnery SGT. said. " I don't care what the TM say's. " Use power steering fluid for power steering and ATF for transmission. That is self explanatory. Good Luck let us know how you make out.