I assume the master on the 3800 is under the floor same as the 3100 series. You'll need a porportioning valve under the master with residual valves. If its a drum/drum set up use 10 lb for the front and 10 for the rear. Place the residual valves as near the master as possible. If its a disk/drum system use a 2 lb residual valve for the front and a 10 for the rear. Thats it.
Good luck


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