Bleeding nipple size on S40 2.4i MY07
 

Hey guys :)
My brake fluid is crouching in my car for 3+ years, it's really time to flush it.

Does someone know the size of the bleeding nipple? What mm of socket do I need?

I'm on work now, and on my way back I'm going to buy a right tool for bleeding nipple. Sorry for bothering.
And if someone knows a tutorial link, I'd be happy with it (;

Cheers,
Have a nice day!

PS : My car still moves on to the front gear in "D", with parking brake "on". Is it normal?
PS2 : And when the parking brake is "on", when I gas it, it moves like there's never been a brake. I know it sounds silly but.. is it normal? Some kind of dumb-proof system that automatically takes off the e-brake?