Yesterday when I went to leave the house I started the car and all I heard is a very loud sucking sound and the brake pedal is rock hard. So popped open the hood and the large vacuum line going from the brake booster to the firewall was broken. It wasn't just broken though; looked like a firecracker. Missing about a 4 inch part out of it. It was fine when I drove it home the night before so I'm guessing it happened right when I started it. I already replaced the line just wanted to know if anyone knows what could have caused it to completely blow apart like that.