the handle bars and or crash bar is linked into the front forks and serves as an air reservoir inlarging the capacity of the forks. so there is more air to compress during normal travel of the suspension. when the brake is applied it shuts off the solenoid and prevents the air moving from forks to bars, that leaves less air and space above the fork oil, when this happens the air in the forks is compressed harder as the forks travel and stops the forks diving.