Hi all, as per title really!

My RS1800 runs full ST170 Engine/box and Brakes. Due to space issues I had to use a Rally Design universal balance-bar pedal-box and AP-Lockheed remote 2.3:1 servos.

My car has now passed its MOT But I still would like a bit less pedal travel, you have to press it quite far down before the brakes do anything but they ARE progressive AND powerful when you do finally get there...

I currently use a 0.625" Master cylinder on the fronts and a 0.700" on the back and both my remote servos use a 0.625 reaction cylinder.

I have a normal focus haynes manual here which says my rear calipers are 34mm piston diameter and normal focus front calipers are 54mm, Does anyone here know the Caliper piston diameter of the st170 fronts??

If i find this out I'll be able to change my master cylinder piston size to suit.

Thanks for the anticipated help!