An important message from the organizers:
Please, please have your mechanic / garage check your brake system before departure. Do tell him you are planning to drive 6 alpine passes in one day. During this trip you will cover large height differences. You will be climbing, but also descending a great deal. Having good brakes makes the difference between having an accident and having great fun!
Verify your brake lines, and ensure there is no air in them. Bleed all the air. Make sure your brake fluid is current, and certainly does not have any water in it (brake fluid is hygroscopic, and will attract water, which greatly diminishes brake performance when it gets hot -- and believe me, it will).
When descending, do brake using the engine. So (also if you have an automatic gear) descend in the same gear that you drove uphill in.
Note, you are taking part at your own risk. Fix these things now, before departure. Last year a German Pagoda group had problems with brakes as they were unprepared.
Peter