Press Down to get into the hydraulics setup. You can then press Left, Right, L2, and R2 to use your switches:
Bouncing: Keep tapping D-pad Down.
Driving on three wheel or other motions: Get your car onto the wheels you want and use the Right Analog-stick to drive backward and forward. Be careful; if your are in three wheel motion decide to lift up the front right wheel from the ground while driving, your car will veer to the right (realistically).
Back to Midnight Club 3: DUB Edition