Audi C6 Sline 2007 brake wont release
 

I have an audi A6 C6 2007 Sline which I have removed the airsuspension from. Now I have the problem that when you put it in drive and release the brake it wont retract the last centimeter so the car wont drive off. Then you need to take your toes under the brake pedal and lift it to make it retract the brakes all the way. I don't know what to do now.