i don't have brakes, but this is a flush system i put on my trailer to rinse hubs. rims and axles. it holds about 5 gallons of water and is pressurized by the bladder tank. i charge the system with a water hose and after launching, i just open the valve down the frame. all of the water stored in the tank and the 2" pvc on the frame is the sprayed on the running gear.
nice thing is, when i get home, i just hook a hose to the outlet by the tongue and let it go for about 10 minutes. close the valve by the wheels, let the system go static, then close the valve by the tongue and i'm ready for the next launch.
the tee handle is for unscrewing and adding detergent , salt away, etc.