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🔧 Technical Brake pad friction coefficient database
- Thread starter Mr_Roboto
- Start date
Make/Model
Kawasaki ZX6-R
Kawasaki ZX6-R
Use them with RBF600 on the track bike, which still has factory rotors, I believe 320mm up front. When the pads are cold it's like clamping a 2x4 block of wood to the rotors and hope something bad won't happen. When they're up to temp, you can lock the front tire at 180mph+ with a single finger on the brake lever. Has excellent initial bite, which can be in issue in the wet. But smooth and linear feel throughout the life of the pad.
Pulled this from the article, for a better understanding of the codes:
Understanding Brake Pad Codes
- All U.S. street-legal and many racing pads have a two-letter friction designator stamped on the pad edge or the backing plate.
- The first letter designates low-temperature friction performance (200 to 400 degrees F).
- The second letter designates high-temperature performance (300 to 650 degrees F).
- The higher the letter in the alphabet, the better the friction performance.
- Normal pad code letters range from C through H.
- If the first letter is lower than the second letter, the pad works better at high temperatures and needs a warm-up.
- If the second letter is lower than the first letter, the pad may fade at high temperature.
- The best all-round street pads have good friction at both high and low temperatures (as in code "FF").
are these even tested under the same scenarios one mfr to the next? this doesn't seem worth the effort since 99% of people don't care/it doesn't matter. track guys are typically sticking with popular recommendations/trying out a brand then moving up or down the product line to see what feels good for them/their setup/their style/their tracks. i never picked a pad based on its friction coefficient.
I pick pads on the friction coefficient. Makes a huge difference
Yes, these are DOT regulated specifications.
When you start getting into race stuff (not stuff that's advertised as race stuff) there may be other paramters that aren't as accurately reflected in the codes alone e.g. over 650F temperatures.
I would also say that ratings are no substitute for testing but a good starting point for making purchasing decisions e.g. you can discard the shit right away.
just not sure what you are trying to accomplish putting in the effort tracking these here?
hawk has put out this:
although i personally don't put too much faith in it outside of "might die in here" zones and have never been interested in running hawks. iirc a long long time ago i used hps or hp+ once.
carbotech lists temperatures but no coefficients - https://ctbrakes.com/choosingcompounds/ (and the temps on the high end seem questionable, have used these in the past ax6 xp8 xp10)
currently on the brz are project mu 999s - https://www.project-mu.co.jp/en/products/pad_999.html
pfc pretty popular with bmw guys i think in particular - https://pfc.parts/motorsports/pfc-compounds/
just not sure what you are going for that is actionable or anything here. most people don't know the temperatures they are operating at, even including most track guys.
hawk has put out this:
although i personally don't put too much faith in it outside of "might die in here" zones and have never been interested in running hawks. iirc a long long time ago i used hps or hp+ once.
carbotech lists temperatures but no coefficients - https://ctbrakes.com/choosingcompounds/ (and the temps on the high end seem questionable, have used these in the past ax6 xp8 xp10)
currently on the brz are project mu 999s - https://www.project-mu.co.jp/en/products/pad_999.html
pfc pretty popular with bmw guys i think in particular - https://pfc.parts/motorsports/pfc-compounds/
just not sure what you are going for that is actionable or anything here. most people don't know the temperatures they are operating at, even including most track guys.
The race stuff won't be there, but then again I don't drive a race car daily and race car brakes are something I'd likely have had to fabricate on any of my given vehicles.
does DOT even matter though? eg. your tires are all DOT approved but 225 from one mfr to the next is going to be different widths in reality. what about the treadwear rating? iirc that generally only applies to relative wear across a company's own brands, one company's 300 tw might be another company's 400, etc.
I have the Hawk HPS (in the graph above) on the fronts of the Caddy and all 4 on the G8.
I can't say I see the 20% - 40% more braking performance than stock that they claim, but I do believe in the fade resistance (I notice it's better with this in the Brembo's on the Caddy specifically) and love the low dust of them.
I can't say I see the 20% - 40% more braking performance than stock that they claim, but I do believe in the fade resistance (I notice it's better with this in the Brembo's on the Caddy specifically) and love the low dust of them.
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