Tell me how this is even taught in "Hydraulics 1A" and let me know if YOU know how it works ... OK?
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It uses brake fluid in a dead-end circuit to activate a plunger that moves a multi-fingered resistor to activate the trailer brakes.
IT USES FLUID VOLUME --- it is illegal on any vehicle with dual master cylinder systems.
Period.
Full stop.
I don't know nor care what the intentions are from the posters with doctorates in Hydraulogy - or whatever it is here --- it is illegal because it steals fluid from the rear brakes unless some brainfart installed it in the front brake system --- then all hell breaks loose.
The system being unbalanced, will then produce vastly inferior and dangerous braking effort
You will go blind because of the BRAKE light staying on all the time.