Alright.
I've read various things about this and can't come to any clear understanding whether or not doing this is worth it.
4/87 325i.
I have a stock braking system and a spongy pedal.
I've bled everything more than once, and I've changed soft hose, pads, etc.
Solid rotors, ATE pads.
Pedal does not sink with the car on or off, though it does get stiffer after one pump in both situations.
I'm aware the 25mm cylinder is not internally biased, and will increase rear bias. I'm not aware if that makes any real difference under normal street driving.
I have ABS, so I'm not worried about the number of ports. I believe the pipes/hoses on the car will pop right in, but please let me know if that's not the case.
My goal would be to get rid of some of the sponginess and pedal travel. It would make heel-toe a little nicer and would increase my comfort using the brakes a bit.
1) Does this make a noticeable difference re: pedal travel and feel?
2) Is the increase in pedal pressure annoying for regular driving?
3) Anything else I'm not aware of?
Thanks!
Last edited by ELVA164; 04-19-2018 at 11:47 AM.
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Brake master cylinder update:
The master cylinder size in my car is 20.64mm front and rear with an external proportioning valve. A late-model cylinder is
22.20/17.64mm, obviously internally proportioned.
If I go to a late-model cylinder, I'll move the bias more to the rear.
If I go to an E32 cylinder the bias stays correct but the change in size is considerable. I'm wondering if it would be too much.
Do I:
A) Use a late-model cylinder; or
B) Use the E32 cylinder?
Last edited by ELVA164; 04-22-2018 at 11:53 PM.
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Any thoughts?
Interested in vintage cars? Ever thought about racing one?
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If I remember basic hydraulics correctly, a 25mm master will require 46% more pedal force than 20.6mm? Don't know how much of that would be moderated by the booster, so you might also consider the need to replace your booster with a larger unit as well.
Interested in vintage cars? Ever thought about racing one?
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UPDATE
I got the late stock E30 master installed and the pedal feels much better. If you have a pre- 5/87 build date car and don't like your pedal, but you're keeping stock brakes, just use the late stock master.
Interested in vintage cars? Ever thought about racing one?
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Elva Courier build thread here!
good to know.
No e30s again.
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