There are 2 ball valves just forward of the drive axle on the PS. The device on the right with 2 wires is a low pressure sender. To the left and above that there appears to be a pressure reducing valve. I doubt they are involved on the brake system! Mayabe to close off the line to the front 110v compressor for service?
Any ideas
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Gordon Hummel
1991 41.5' #266
8v92
2009 Pontiac Vibe GT Toad
Fulltime on the road