Sam,
We have a Blue Ox brake system used in our toad. It operates based on an electronic solenoid system. A friend of ours has the Tow Buddy system and his operates via an air compressor system.
His was not applying brakes when first purchased. I found 1) He hadn't pumped the toad brake five times to drain the toad vehicle vacuum utilizing the test button 2) He didn't have the air compressor regulator adjusted properly to apply toad brakes. 3) it takes a 15 amp 12v power supply to operate, he was blowing fuses until I changed circuits.
Call support if all else fails they helped us through the process. Let us know how it turns out.
https://www.brakebuddy.com/pic/instru.../bbclassic.pdf