I thought my foot slipped off the brake and taped the rear end of the car in front of me. scratched the bumper of the car i tapped. i was on i 95s towards fredericksburg, va when my brake warning light came on. taped brake and the pedal almost went to the floor, but i did have some braking. got the truck to the repair shop, diagnosed will hole in brake line caused by rust. replaced 18 ft of line. *tr