I was moving my 1500hd gmc sierra which has 29k mile & the front brake line under the radiator, blew out due to rust this is a nightmare for any gmc owner , upon an inspection of all brake lines i find they are just steel with no anti corrosion on any of them. i also own a 2002 yukon & now it has the same problem, all lines are badly rusted & just recently the lines on the rear axle burst. this is life threatening situation the very this you rely on the most is brakes.