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I recently replaced the brake system drier on my m1088. Prior to loosening the bolts for the old brackets, the system built pressure. When I did a test of the system, before the final bolt down, the gauges showed no air pressure. Maybe it is a grounding issue? I saw some grounding straps around some of the air valves. Do these valves and controls need a ground? Also, what does the small air line do? I think it goes to the compressor regulator or something.