UPDATE: I had to replaced to ABS pump. It was fouled by old brake fluid. Replaced with pump order from a yard in Florida, flushed brake fluid system and it works great now.
Appreciate the help, I'm not a mechanic so I have to keep asking questions. Cracking the line where? The nipple at caliper? The fitting at the master? Under pressure from master cylinder? I just need a little more information.
I have a 1997 C1500 2wd 5.0. I thought I had a failure and had replaced the master cylinder two months ago. A couple a weeks ago the rear brakes locked up on the highway. I replaced the left rear wheel cylinder and it didn't fix the issue, it would just move to the next wheel. It will drive...