The only brake lines not done on my 97 GMC Sierra are over the RR axel. I was lucky 2 years ago. Front R line popped went to floor, wouldn't pump up, heaeded for the rear of a car, looked to the oncoming lane, empty, cut left missing rr of car by paint job, went 50 feet and cut sharp into side street. Whew! Drove home 30 mi. w/ e brake.