ATE front brake overhall

[bikeboyz]

I am just about to overhall the front calipers on the 504, they have ATE pads, and according to the rubbers on the piston Girling. My Pug dealer who I reckon thinks I'm rather a fruit loop by now, has ordered me an overhall kit (from my 1968 part number!!).
What should I be aware of when doing this overhall. I am going to replace the master cylinder too, so the norm of bleeding the system and clutch in this case is expected -)
cheers Mat.