I got some play on my steeringwheel.

It seems that when I drive and have the wheel in centre, I can turn the wheel about 1 to 2 cm each site (about 3 to 4 cm from the leftside play to the rigth side play.) without the feeling something happens...
The feeling is that for that 1 or 2 cm there is no resistence...

Is there a way to adjust the play? If so, how to do it?

Or does my fluid has to be filled?
I have a Touring, but could it be, when the fluid is on the low side, that the steering gets some play?