Help me please!

Hello blender world, ive made a sort of car suspension and drivetrain etc.etc. and ive gotten it working for the most part except for one thing, i moves itself forward. ive isolated the problem to the front wheels, and even more so to the constraint between the wheel and the car, its a rigid body joint and its a ball type joint, iv’e tried the others but they all do the same, they let the car go forward. i know i may very well be one of(if not) the only one messing with getting suspension to work in the game engine with only logic bricks. any suggestions are welcome:)