750i MC upgrade myths

[rwh11385]

I did the swap and found that it increases feedback quite a bit, very important when close to threshhold. I agree it doesn't affect brake pressure, just line pressure/pedal travel. If you don't like alot of feed back then don't do it, but a new one was cheaper than the direct replacement one, so you lose nothing by doing it.

with larger pisto you won't be able to push the pedal the same distance, unless:
a. you bend the pedal
b. you boil the fluid
c. you stretch the hell out of your lines
d. the pad goes through the rotor
(list is not comprehensive)

say the maximum amount of force you are able to apply with your foot is F, with larger piston you will have to push more than F to create the same amount of pressure in the system. (which would be impossible since F is your maximum to begin with)

a very good read:
http://auto.howstuffworks.com/brake.htm

Increasing the master cylinder diameter from 23 mm to 25 mm leads to an 18% increase in cross sectional area. This means that for every centimeter that you depress your brake pedal you are moving 18% more brake fluid. The result is an 18% increase in brake pedal stiffness (i.e. an 18% reduction in brake pedal travel) -

from http://e30m3performance.com/installs.../25mc/25mc.htm

you aren't going to increase the pressure at all overall.... because your pedal travel is reduced at all.




ALL you are gonna do is make your brakes overally stiff for that racecar feel on your daily driver..... which is the definition of FUH RAZE


if you are trying to modulate your braking with Hawk Blues and on R compounds hitting the track hardcore and it is your preference to change the pedal feel.... that's one thing, but "upgrading" to an 25mm MC because you are ignorant and think it will make your car stop faster..... that's stupid. go home

p.s. it's not really 23mm to 25mm, it's the "E32 750i and E30 M3 brake master cylinders are 25.40mm and 23.81mm respectively.

This means the the increase in bore diameter is not as great on a relative basis. The increase in fluid moved (i.e. the increase in stiffness) will be 13.8% which is a somewhat lower value than the 18% mentioned above."

[rwh11385]

because it seems reasonable that a mc with a bigger cylinder offers more force.

your assumption is false.

[PeaveyBassist]

Wow... a BUNCH of Heeter posts right after eachother lol

Will

[PeaveyBassist]

And btw... I am getting an m3 master cylinder on my car for daily driving. AND we had an m3 at work the other day. On top of the MC it says "20"... not 23. So I assume its 20mm not 23mm. Am I wrong?

Will

[rwh11385]

Wow... a BUNCH of Heeter posts right after eachother lol

Will

i guess after lining up the facts and explaining how he's an asshat, parkerbink went back and deleted all his posts...

what an asshat


thank you static for this thread, maybe more and more people will read and acknowledge it... if they are capable of understanding the concepts involved

[UNHCLL]

And btw... I am getting an m3 master cylinder on my car for daily driving. AND we had an m3 at work the other day. On top of the MC it says "20"... not 23. So I assume its 20mm not 23mm. Am I wrong?

Will

Yes.

M3 - 23mm
e32 - 25mm
325 - 22mm

[PeaveyBassist]

Ah i see. I thought the 325 one was 17, m3 was 20. I am t3h wrong. I stand corrected.

Will

[rwh11385]

fuc kparker brink. he made it sound like i have an cacolgic problem

p.s. will did you get my voicemails???

[parkerbink]

Poor Bobbie having another episode, so sad. Stop drinking perhaps?

[Jordan]

I think this thread has run its course.

[shrewgy]

Gentlemen,
I am writing in hopes that you guys have the message received to all threads that you post in feature activated. I am speaking only to those of you that are adults, with REAL information in this thread, to be clear.
My question is "What about the e28 MC as far as it being a 3 or 4 channel ABS system?" We qare having a crazy cold snap out here and going to a junkyard to research this would be oh so fun...not. Pulling a part that you don't even want sucks, double that if there is fluid involved, 1/2 point more for brake fluid.
Oh yeah the e30 M3 MC sounds pretty sweet except for the annoying requirement of re-flaring the line that will need a larger fitting and the charming price of all things M.

[turbo_negro69]

holy dead post batman!!!!!!:giggle:

[e304me]

is the stopping distance really increased? I thought the booster could compensate

[SA E30]

I was just thinkin this... as I found my brake pedal has far to much travel, not so much on the road, but when on the track, I found I really had to slam it down..

So what I understand is that all this will do is reduce pedal dsitance... which will also help with heel toein a bit as the pedal is closer to the brake.

Will this Master Cylinder work with a non-abs car ? ... also are there any other BMW Master Cylinders that will work ?

Also, brake booster ? I know using a smaller one will make braking harder... so how will that affect my choice of master cylinder ?

[PiercedE30]

If you are running without ABS then just put a T fitting in the front hole and run the lines that way.