Front piston size

[Red baron]

Guys, what's the size of the pistons in the front calipers, and how many are there in total.
I'm asking as getting some new custom disc and calipers for my quad project, and the designer wants to know about the displacement
Gen 1 1999
Many thanks

 

[RedBull]

 

[Red baron]

Thanks for the video, but unless I missed it(I did watch the whole video) he didn't say the piston sizes
Cheers

 

[RedBull]

 

[Red baron]

2x22s
1x20

Many thanks

 

[Berlin Germany]

little late hint to the piston´s ;-) but I think it's of interest ;-)

the 99 has coatless steel pistons

the following busa´s (i think later than ´02) calippers
have same sized pistons, but those are made of aluminium and have furthermore a (teflon?)coating
their color is light anthracite

my experiance :
1st these "grey" pistons are gliding a bit better than the steel pistons
2nd the tocico calippers, their piston, and their rubber gaskets should be cleaned every 18-20,000 miles to keep the brakes in good condition

my 2nd experiance :
the hand force you need increases the later you clean the calippers and at least the stoppers only serve to maneuver and park the bike but never brake properly !