My TV broke a brake line last week. It is a 2006 Escalade, the brake lines are terribly rusted. I guess this is a common GM issue. If you have a GM truck you should inspect your lines. Glad this didn't happen last summer driving down Mt Washington. I bought a full set of pre bent lines and am going to change the front lines and master cylinder lines this weekend. Looks to be a pain. I think I need to jack the body off of the frame a little to run the lines.