A brake works by directing the high pressure gases from the burning powder to the rear and sides rather than the front of the rifle. By accelerating some of the gases rearward some of the momentum that would otherwise go forward (and therefor push the gun backward) goes backwards or to the sides instead. Thrust reversers on jet engines work in an almost identical fashion by directing gases to the side and front of the airplane instead of the back. The problem is that when you turn these gases toward the shooters ears you obviously hear it much better. I honestly do not know how the compensators that direct the gases forward actually work, or if they work (I have never used one) since if the gases ultimately end up going forward they will push the gun back against the shooter. Perhaps the forward directing compensators somehow slow down the gases before allowing them to exit to the front, thereby reducing the momentum of the gases (or maybe they don't really work, I wonder if they just make the rifle quieter and that makes the gun feel more comfortable), but if they work that seems like a great solution.