Open the shut off valves of both trailers | |
Close the shut off valves of both trailers | |
Open the shut off valves of the second trailer and close the shut off valves of the first trailer | |
Open the shut off valves of the first trailer and close the shut off valves of the second trailer |
You`ll hear air escaping from the open valve | |
Nothing | |
You`ll see the brakes on the last trailer engage | |
You`ll see the emergency valve open and release air |
Pull forward slowly then apply the brakes and watch for a drop in air tank psi | |
Open the service line shut off on the rear trailer | |
Open the emergency line shut off on the rear trailer | |
Use a calibrated air pressure gauge |