All the of metal and rubber lines are brand new, the only old still on the truck are the two banjos on the rear drums and the T fitting at the top of the axle. We hooked the vacuum up to one drum and cracked the other open and had air moving through that section. Leaving the T fitting as the only other thing that could be clogged. Hadn't thought about the rubber line collapsing, will also take a much closer look at it next week. Thanks for the tip.
