What else to replace when replacing Master Cylinder?

[Stu]

I havn't replaced it yet, I'm going to get materials to run ducts to the front backing plates and want to do it all at once, I just ran out of time last weekend.

Jay, just a few mm increase in piston size will push a lot more fluid, giving the drastic seat of the pants difference in the pedal. That's a bit armchair though, I havn't even done the mod yet.

[UNHCLL]

E30 M3 = 23mm
E30 325i = 22mm

I swapped to 25mm

1) You will NOT have better braking power
2) It removes ~85% of pedal travel
3) You will put yourself through the windshield for the first few stops after the swap


Overall, my impression was so/so. I like having less brake pedal travel, but it made inside/outside blips a bit more difficult.


I did not see any increase (rather decrease) in stopping distances.


HTH,
Chris

[Stu]

E30 M3 = 23mm
E30 325i = 22mm

I swapped to 25mm

1) You will NOT have better braking power
2) It removes ~85% of pedal travel
3) You will put yourself through the windshield for the first few stops after the swap


Overall, my impression was so/so. I like having less brake pedal travel, but it made inside/outside blips a bit more difficult.


I did not see any increase (rather decrease) in stopping distances.


HTH,
Chris

Chris,

One of my main problems has been serious pedal travel. Even with bleeding the system 2-3 times (15-18psi), I get a sponge pedal. The pedal also seems to have some play before the brakes activate...I wonder if this is related to the pedal-adjustment or something else.

I'm expecting a stiff pedal, I don't like having to move the pedal a lot to make braking adjustments on the track--so hopefully the V12 MC will suit my needs. I'm planning to run a 1" larger rotor and slightly larger pad in the future as well.

Thanks for the tips Chris