breaks locked up? Help!
 

haha spelled brakes* wrong


but heres the deal, 2001 xj, havent driven it in a week and just went to try and take my dog to the vet, it usually fires Right up but it took 3 Cranks this time til it did, put it in reverse and started backing out the driveway to find out my brake pedal won't even go down and they aren't engaging. A car was coming down the street as im backing out and cant stop so I started flipping out that I couldn't stop and just rammed them as hard as I could and pulled the e brake, luckily it engaged so it must be something else. Had some trouble getting it back in the garage, but I did. checked brake fluid, was filled up. the top was loose but that didnt affect anything

No idea what's going on. Any help is appreciated.

Btw, had to drive the dads wrongler to the vet and it ended up raining in the way there. Fml haha