[rowdy]

I had this problem on my 2.0d
In my case it was the clutch slave cylinder leaking in the bell housing (difficult to see as not leaving any fluid on the ground as inside bell housing)
The brake pedal would need pumping a few times to get pressure, and led to clutch slip so ended up having clutch, flywheel and slave cylinder replaced.
Keep an eye on dropping brake/clutch fluid level.

I believe slave cylinder may be a recall on some models?