Going to be changing my discs and pads 312 set up. What size allen key is to change pads?

7mm for the pads, 18mm socket for the carrier.

6mm allen key to get the disc off the hub , 13mm spanner for the flexi-pipe banjo bolt and an 11mm for the bleed screw

Thanks guys - my discs are held by a phillips screw:confused:

Can be held on with a phillips screw, sometimes a T30 torx screw not seen a allen key myself but wouldnt be suprised.

The fluid line is a 12mm banjo bolt and the bleed nipple 11mm.

But if your just changing pads and discs then that wont matter.

All here btw

http://www.briskoda.net/forums/technical-guides/312mm-brakes-pictorial/47673/?highlight=fitting+312mm+brakes