Brake fade
- Thread starter RODOLFO
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19 m/c on a 2019 v4s.... my sixth penneth would be around the ratio of your master cylinder to callipers means you are not getting the best retardation on the discs for your effort on the lever.......tin hat on.....
fix- get a 17rcs ratio master cylinder
fix- get a 17rcs ratio master cylinder
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Well I can assure you I like you are braking really hard.... to the point of bottoming out and I don't get brake fade. I have previously run the 19 m/c and its feeling is quite wooden compared to the 17 so I wondered if the OP's fade feeling was linked..
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@RODOLFO you were running under 2:30 at COTA which is insanely fast and that track has some of the hardest braking zones on the planet. You were passing me on the brakes and I am usually pretty aggressive on the brakes myself! I don't think you should over think it.
However, whenever I run COTA, I do change pads more often even if they show enough meat on them, they can get glazed over and lose braking efficiency. I run Castrol SRF fluid which has very high wet boiling point, i.e., even after it absorbs moisture like all brake fluids do, it will still retain an extremely high boiling point.
If you still have brake fade issues, I would try the following. I run all three on my single caliper system bike and they help.
However, whenever I run COTA, I do change pads more often even if they show enough meat on them, they can get glazed over and lose braking efficiency. I run Castrol SRF fluid which has very high wet boiling point, i.e., even after it absorbs moisture like all brake fluids do, it will still retain an extremely high boiling point.
If you still have brake fade issues, I would try the following. I run all three on my single caliper system bike and they help.
Brake pads are another variable. For example, Brembo offers pad materials that have a coefficient of friction that increases with temperature.
Few pad manufacturers provide information at this level of detail.
www.rideapart.com
BRAKE PADS: HOW TO CHOOSE THE RIGHT ONE FOR MOTORCYCLE, SCOOTER AND OFF-ROAD | Brembo - Official Website
Few pad manufacturers provide information at this level of detail.
Brembo Introduces New And Improved Brake Pad Compound
Brembo introduces the new SR compound brake pads that perform well in high heat and keep riders at the front.
www.rideapart.com
BRAKE PADS: HOW TO CHOOSE THE RIGHT ONE FOR MOTORCYCLE, SCOOTER AND OFF-ROAD | Brembo - Official Website
Thanks guys
to explain the problem,
it was at the fourth session, the brake lever, was going back and back, untilI hitted my
i could adjust the lever forward, to fix it, but it is kind of annoying and you loose confidence on the brakes.
I have to check, what fluid my mechanic is using, and consider the some cooling options.
also, about the master cilinder, when i order it, there was a lot of confusion about 17 and 19,
i went with 19, and feeling is ok, even kind of spongie, I don’t know if it is because of the ABS, or maybe there is some air in the system
Thanks for all the advise, I will look into it
to explain the problem,
it was at the fourth session, the brake lever, was going back and back, untilI hitted my
i could adjust the lever forward, to fix it, but it is kind of annoying and you loose confidence on the brakes.
I have to check, what fluid my mechanic is using, and consider the some cooling options.
also, about the master cilinder, when i order it, there was a lot of confusion about 17 and 19,
i went with 19, and feeling is ok, even kind of spongie, I don’t know if it is because of the ABS, or maybe there is some air in the system
Thanks for all the advise, I will look into it
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Sounds like air tbf. Did you bleed the system at the track? I have heard of faulty bleed nipples too, very rare though.
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I think you have the cylinder bore thing the wrong way around...big bore low pressure, small bore higher pressure. It takes more force to create the same pressure as a smaller bore. While a larger master cylinder will take up system slack with less pedal stroke, it will take more force to create the same system pressure.
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I should have said lever stroke rather than pressure however I stand by the idea that the 19 will provide greater clamping force on the pads than the 17 provided the same stroke.
Reason being that the 19 will displace more fluid for the same stroke than the 17.
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The 19 will displace more fluid per stroke given the same lever ratio.
Interesting debate though… what’s your theory?
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This would make sense at the other end of the braking system.
If the caliper piston is bigger then it would require more pressure to move the same amount as a smaller piston.
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This is self contradictory!
He states that a bigger bore MC will provide lower pressure but harder pedal feel?
That doesn’t make sense.
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