I like the PVC idea. Strong, durable, dirt cheap. However, I am not sure how it would stand up under the hood to engine heat, so, my idea would be to put it underneath somewhere. Plenty of room on the S-10. Strap it to a frame rail. Of course, this introduces the possibility of something being kicked up and puncturing the PVC. The solution to this is a cab mounted cutoff switch that you could throw to isolate this spare vacuum quickly to get your brakes back.
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