The pulsing of the ABS could be a factor, but those lines on my 03 were very thin after rusting away. I've driven in the NE for 35 years and have never seen rust progress on lines so quickly through the walls. Seeing the rust to the master cylinder is also something I've never seen. I've seen some similar vintage GMs and they are not all the same. This may sound nuts, but I almost thought that truck had electrically induced galvanic corrosion, if that's possible. Rear bumper rusted in the first month. Exh manifold heat shields rusted off several times under warranty. Heck, the tranny dipstick handle rusted off!
One shop replaced some lines for me with what I believe was a nickel copper alloy and designed for brake lines. Easy to bend and form. I had no problems with them for 5 years and they still looked good.
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'67 GTO Convertible - a couple extra HP, On the road!
'68 GTO Convertible - in frame off stage
'67 GTO Hdtp, HO 4 speed - next
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