u/pcsrh

Our car isn't able to lock the wheels under hard braking. We're using a Bosch 19.05 mm master cylinder with KBX Vespa single-piston calipers (29 mm piston).

The calipers are moving and we have braking force, but it feels much weaker than expected.

Could the 19.05 mm MC be too large for the 29 mm caliper, or is there something else I should check?

Any advice would be appreciated.