not a lot . the 2.8 will require more fluid / pedal travel . brakes drive me nuts and i was a hyd tech in the navy .
larger the bore in an actuator the more fluid and psi to move it but it will have more lift power .
on power brakes the larger dia of booster the more lbs of boost, or a dual diaphragm . those little 7 in boosters are useless . a smaller m/c bore = more power but more travel , larger bore m/c = less power but also less travel .. pedal ratio is more important . if your pin hole on the pedal is 2 in from center you can redrill at 3 in and get less travel and more power .

hope this helps .