It would have a similar effect to what maupineda describes when dropping total piston area - less clamping force and the feeling of it being a bit more linear/longer (without the other benefits of upgraded calipers - better heat dissipation, more consistent pad vs disc geometry etc).InterlagosMC wrote: ↑Mon Jul 17, 2023 5:35 pm Has anyone tried changing the brake master cylinder to better suit the Caliper sizes, I know that brake force would reduce with a larger MC but it would give better pedal feel?
I think we're talking about a couple of different things here though - perhaps you can clarify, OP?
"Firmness" is the feeling of a direct connection between your foot and a hard pad making contact with a hard, unyielding disc. "Bite" is the point at which you feel actual retardation kicking in. A lot of non-sports cars have very early and aggressive bite but with crap, spongy pedal feel. If you drive something like the 997 mentioned above, you'll find that Porsche usually like to set up their brakes relatively "long" and progressive by most standards, but the feel is really nice and in some cases it can feel almost as if you're pressing directly on the brake discs with your foot.
With the Z4M, most people think it's unnecessarily over-servo'd, i.e. the brakes bite a bit too early and non-linearly (especially when you consider the fact that they are actually very good at stopping the car and most Z4M drivers can drive a bit). It's the same theme of erring on the side of caution that you find in loads of other areas of the way the car is set up - the rear toe-in and camber, the emergency braking function, intrusive TC, the "I AM BRAKING VERY HARD NOW" brake light display etc.
FWIW, mine bite very early and the feel is ok but not the best. It was improved a bit by upgrading the front calipers, but not night and day. I'm still on stock pads and have rear factory lines, so those are a couple of obvious things to try and upgrade in the future.