2014 prius c brakes

Hey guys so I just bought a 2014 prius c one with 129,000 miles on it and I haven’t even drove it 60 miles before it “stopped” working on me. I pulled out of my driveway and all of a sudden i got a row of all 4 brake lights on with a beeping sound that won’t stop & it won’t let me brake. The reason I say “stopped” is because I can still kind of brake if i’m going slow but it feels like the brake peddle is resisting. I went out and bought a new battery to see if that was the problem because I read somewhere it might be since it was coming up on it’s last year or two of its life but nope didn’t work. I have no idea what’s going on can someone help??