lockbar is a bar that gets installed in the rear to lock the back up.
then you can remove the hicas all together.
i removed all my hicas lines and solenoids and installed a lockbar
which means the car drives like a conventional 2 wheel steering car
if you search the forums youll find all the info you could ever want
i personally hated the 4ws - especially on the track
mine wasn't even faulty and i took it out!
(so if you do actually want to keep it and need any parts ask me! lol)