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09-15-2022, 02:44 PM
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#51
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Second Lieutenant 
Drives: 2015 M3
Join Date: May 2018
Location: SF Bay Area, CA
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Quote:
Originally Posted by D_SheerDrivingPleasure
Quote:
Originally Posted by melanthius
I don't think I'm boiling anything, I have fresh SRF fluid, the SS pistons, Ti shims... I tracked it yesterday and still get mushy pedal that persists well after the track session. I need to replace front pads, and I'm going to have the shop do another full bleed + ISTA DSC/ABS bleed, if that doesn't give me a firm pedal I'll try recalibration thing... then the only place left to go is full BBK.
The kit I got from racing brake included the high temp seals and dust boots.
Definitely SS is a superior material choice for the pistons, and has lower thermal conductivity than aluminum, and is less compliant, plus the little ridges reduce the contact area compared to a complete circle, which also is directly proportional to heat transfer capability. So there's lots of benefits there, it's not just marketing. The question is the OEM caliper itself, I think a lot of the compliance in the system is coming from this. That is probably one of the more noticeable things on BBK is just much higher stiffness of the caliper + overall system.
My calipers are still blue...  will update if it changes though |
What rotors?
Changing to fresh pads will improve pedal firmness on its own. Maybe try that before the complete flush?
But I agree that a BBK is invitable if your fast and driving extended sessions on slick tires.
Personally, I see a lot of people buying fancy BBKs way before they have outgrown the blue boys. |
Oem rotor
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