okay then, spawn as the engineer class and find ur enemy vehicle (make sure there's actually an enemy piloting it.) Change weapon to the fusion cutter, get close enough for the health of the vehicle to come up on the top of your screen and press the primary fire button (default R1). hold it down and you will see a slicing vehicle message on your screen, dispaying how much you've sliced. Simply keep slicing until it reaches 100% and the pilot will come out. The vehicle won't be driveable for a few seconds so be ready for when it is.
"The Shroud Of The Darkside Has Fallen. Begun The Clone War Has."