There is a common assumption that you need to upgrade the master cylinder.

But if the Rev1 is 15/16, then there is no reason.

I know for 100% that my rev2

(bigger brakes) is a 15/16 MC

And the only difference between the brake hoses

(flexi) is that the Rev1 is an inch longer.

I assume this is becuase they're smaller discs etc so the connection is lower down.

So in short, nothing other than the discs/pads/calipers needs to be changed if the MC is 15/16 on your Rev1.

Let us know as it will be good to get a definate answer.

Ant