The corrosion on this 2005 Mercedes-benz E-class was mostly due to the fact that it was used to drive down a muddy track on a daily basis to take feed to the owner’s horses. The bodywork of the vehicle was fine, but rust had attacked the small section of brake pipe which was exposed to mud thrown up into the rear wheelarch. The small pieces of straw mixed in with the mud had given it a thicker consistency, meaning that it didn’t wash away easily.
The brake pipes on either side of the vehicle stretch from the front to the rear, but 99% of the pipe was in roadworthy condition because it is protected by plastic undershields.
At first glance, our biggest concern was whether or not the corroded union would come undone. Cutting the pipe just above the union allowed us to fit a six-sided socket and the union itself came undone without a struggle. A new cupronickel pipe was fitted, along with new unions, and the system was bled out.
The corrosion of the brake pipe was limited to a small area which was unprotected from the mud.