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      08-15-2021, 06:30 AM   #1
alindquist
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Brake pedal feel. Soft?

How is your brake pedal?

No matter how I bleed and what I do I can't get the pedal getting as stiff as I want, it's a bit soft and has way to long travel. I bleed it with INPA.

My 135I is more or less a track car, current setup is:

Stainless pistons both front and rear.
Braided lines.
RBF660 Fluid.
Pagid RSL29 pads both front and rear.

All brake / saftey nonsens programmed off.
The pedal feel got way better after I programmed it, but still crap. Way to bad to trust it fully on track.

Do you feel the same?
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      08-15-2021, 09:12 AM   #2
tracer bullet
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I'm quite sure you know the obvious things - a chance you didn't get the air out, or an actual master cylinder issue of some sort. After that... Do you have an opportunity to drive other 135i's for comparison? There's a chance your pedal is as good as it can get with the car and it just doesn't meet your expectations?
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      08-15-2021, 10:04 AM   #3
alindquist
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Quote:
Originally Posted by tracer bullet View Post
I'm quite sure you know the obvious things - a chance you didn't get the air out, or an actual master cylinder issue of some sort. After that... Do you have an opportunity to drive other 135i's for comparison? There's a chance your pedal is as good as it can get with the car and it just doesn't meet your expectations?
Yeah, but it's good that you mention it. I've tried bleeded the system in various ways, and several times and it doesn't help.
I've been thinking of the master cylinder, maby swap it for a m3 one.

When the car is turned off, the pedal is as stiff as I want it. But asap I start it, it gets softer and when I press is really hard it sinks slowly slowly...

Yes, that's a fact. I don't know if this actually is a "good" pedal feel in this platform.
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      08-15-2021, 12:47 PM   #4
NorthernDancer
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If it's a track car, are there not many others at the track who could offer advice too? I use a pressure bleeder and have never had a problem. About 250-300 ml out of each rear, 150 out of right front and 100ml out of left front.
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      08-15-2021, 06:35 PM   #5
iminhell1
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So if feel with no vacuum assist is what you like, just reduce the vacuum assist with a restrictor.
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      08-15-2021, 07:28 PM   #6
mindspin311
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If the pedal initially gets hard, then sinks as you maintain that pedal pressure, then most likely your master cylinder is failing. No need to upgrade, just replace.
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