Airbrake effectiveness

There are some different approaches building airbrake systems.
Some seems to me disrupt the aircrafts flightpath if used mid air. Some more effective on the ground due to making groundpressure beside braking.
I have some questions that is to me unanswered.
Have different types of airbrakes different main purpose? (exept the obvius canard type)

Some planes, like alpha jet and Tejas and many with them have a brake in the rear pushing air up.
This airbrake seems to me, pushes air up and no air down, the netforce exept direct brake pushes the plane down behind the main landinggear. This should also lift the nose gear up if on the ground? Make a less effective brake on the frontgear? This netforce should also make braking in the air pitch the nose up. The nose up will also make the angle of attack be a effective airbrake.
http://upload.wikimedia.org/wikipedia/commons/f/f4/IAF_Tejas_Landing_at_Aero_India_2013.JPG

Some planes like F-15 and EF, Su-27 fam, Mig-29 fam have the same config pushing air up, but in the forward position over the wing. netforce should also push the AC down as well as nose down? (if not counteracted with controlsurface movement, like big flaps movement). This should be effective in landing, but less effective in midflight(disrupt the nosepointing). This should also be effective on the ground pushing both frontgear and maingear to the ground
http://upload.wikimedia.org/wikipedia/commons/9/94/Eurofighter_Typhoon_01.jpg

Some like Rafale have a mid mounted over wing airbrakes pushing air up. The netforce would push the AC down but no pitching nose.
http://www.aircraftresourcecenter.com/rh/images/galleries/articles/274-373/17427/gallery_31948/photos_1289945644_th.jpg

Then there some, like Gripen and F-16 that pushes air in two directions and therefore counterbalance the netforce. This generates no groundpressure in landings, but should be the most effective in the air?
http://www.warped-photography.com/Other/Miscellaneous/Saabs-70th-Birthday-Air-show/i-WFw76Pf/0/L/Twin%20seat%20Gripen%20landing-L.jpg