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Get a known good, air pressure gauge that goes over 150 PSIG. Attach it with a hose to the passenger side kick board air pressure take-off valve. Run that up to where you can see it all the time. Watch that gauge operate. It wil show the pressure increase decrease as the regulator kicks in the...

Just put an LED into the cab and one would always know if the switch itself is functioning with a brake pedeal press. This is just for to see if the stupid swicth is actually sending and thatswitch actually IS functioninal closed . Do you want the information / and how to do that?\ I worked...

Attach service air/instrument air to the right hand rear glad hand. Compressor far away' Have soldier "B" operate the brake pedal while one crawls around under truck seeking leaks and mal-functions. Block the wheels and remove the battery tie and be safe. In this way there is no engine or...