I have a 2005 FX4 SuperCrew. I go to start it, and it has big trouble turning over all the sudden. After it finally starts, I drive about a quarter mile, and the brakes are all the way to the floor, and really tight. It takes all my power to make it stop. I get it back to the house a few miles away, and I pop the hood. I notice when I rev up the engine, it seems like it doesnt have any power, and the engine isnt warm. I dont know where to start with this one. Any help would be amazing. Thank you.

 

Sounds like your power brake pump went out......

 

Check for vacuum leak.

 

i agree with lemming, probably the brake booster

 

I would start with a vacum leak first. Then go to your brake booster.