i have a custom built trike i bought a new booster master cylinder with exchanger valve for disc and drums,can i hook up the rear where they are supposed to hook up but put a plug in the hole where the front disc would hook up and it would work?because i dont want to hook up the front disc right now,i had it unhooked before,i just wanted to know if the rear brakes would work pluging the disc hole on the valve for now?