Some aircraft have air brakes in an aerodynamically neutral position with respect to rotational forces on the airframe (e.g. F-15)...
... more often, others have brakes that are aerodynamically neutral by being opposing (lots of examples, F-16, Space Shuttle, here's a Buccaneer)
... but the Hawk has an air brake that, because of its position at the tail end of the aircraft, and without any opposing force, I would have expected to generate a severe downward pitch as it is deployed, in much the same way as the elevator.
It obviously doesn't, so the question is - why not?