Sirion M1 Master cylinder and brake booster upgrade

[TPG]

This is exactly the same as my experience

Track Day GTVi - South Australia

This current setup is the Copen Caliper and Discs (246mm I believe) and Dixcel Z-Type Pads. They were a marked improvement over the factory Sirion M101 GTVi brakes which I believe were 234ish and a smaller caliper? I didn’t realise the M300 Sirion’s had larger brakes again? but perhaps not in Australia given we didn’t get 1.5L Sirions. I’ll have a google around for the 254mm’s & 54mm piston calipers. Based on the GPS data, I now outbrake the Proton Satria GTi (larger discs and two pot front ca…

“Whatever size the stock M101 gtvi master cylinder is, the braking efficiency all happens towards the end of the pedal”