I just completed the braking via the Elevators set up on my Boomer and it end up kind of proportional, the brakes comes on on the last 20% of the down Elevator which is what I wanted, I wanted them to give me drag to slow down only, I understand it is bleeding air when the brakes are applied but it isn't much and the brakes are effective all the way down to 10% of air remaining in the tank.

Perfect, can't wait to try them tomorrow

ps: The brakes are on chl 5 in order to have access to the right slider on this radio, gear is on chl 10.