Ted,
If I were tackling that issue, I’d consider two possible approaches.
First, since it’s an air line, I’d run it out the bottom of the steer bay along the length of the coach through a groove I’d create just behind the angle that runs the length of the bays. This groove would be just under the polished stainless door threshold trim and behind the bottom flange of the bay door. After grooving it out for the new air line, I’d install the line and re-insulate it with spray foam. The foam insulation acts as a sound deadener, so while it’s not critical, it would help keep the air line in place without needing additional adhesive. Once you reach the bay, you can determine how to route the line to the valve.
The second option, which is trickier, would involve feeding the line through one of the tubes that Prevost uses to carry wiring and air lines from the front to the rear. You can access these tubes by dropping the bumper and looking up at the top rear of the Cruise Air compartment. These tubes extend to the rear, and at least one exits at the rear bulkhead of the water compartment ahead of the drive axle. I’d probably prefer this route and would use a snake or line that plumbers and electricians use to fish the air line through the plastic conduit.
Either way, it’s going to be a job. Honestly, I’d rather eat bees than go through what you’re facing, especially since this repair won’t add any value to the coach. But think of the quality time you’ll get to spend with your bus!
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