Over the last month I've had an issue with the brakes on my GTi TDi where in the brakes wont work on the first attempt. I can press the pedel to the floor and it wont do anything. But the second I lift my foot off and press them again they are fine. It only seems to be an issue in the wet or after I have washed the car and the brakes get wet. Has anyone else had a problem with this and know how to solve it?