Brake fade

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If you have the 19rcs, you need to pull on the lever a lot harder for similar braking, compared to the 17. The 17 will have greater lever travel.

It's basic physics! Smaller piston is required to move further to displace the same volume of fluid required to move the caliper pistons a given distance.

The force exerted on the brake pads is the same. Ergo, if you have to exert the same force at the lever, over the lever travel distance, the force required per mm is greater for the lever that travels the shorter distance. As the 19 lever will travel less, the force required at the lever is greater.

Andy is right.

You don't need YouTube to tell you this.
 
RickD996 said:
If you have the 19rcs, you need to pull on the lever a lot harder for similar braking, compared to the 17. The 17 will have greater lever travel.

It's basic physics! Smaller piston is required to move further to displace the same volume of fluid required to move the caliper pistons a given distance.

The force exerted on the brake pads is the same. Ergo, if you have to exert the same force at the lever, over the lever travel distance, the force required per mm is greater for the lever that travels the shorter distance. As the 19 lever will travel less, the force required at the lever is greater.

Andy is right.

You don't need YouTube to tell you this.
Click to expand...

Lol you just confirmed what I said in the the first paragraph of your post and yet you say Andy is right.

He might be but I’m pretty sure I’m correct.

Also the OP mentioned brake fade and described the symptom as long lever travel… therefore attributing the 19 over the 17 as the culprit is Alice in wonderland.

Truth: 19 will offer shorter lever action but require more force to pull and have a higher ramp of progression. More “bity”.

17 longer lever action, less force to pull and shallower ramp, more modulation.
 
Last edited:
IF you are bleeding them and aren't sure of what fluid is in currently, flush and put in Casrol SRF or Motul RBF 660. SRF is better, but also a lot more expensive. I think there is a Motul RBF 700 now also, but I've not tried it.
All the fade issues I had, after changing to betterr pads, on my StreetFighter V4S, RSV4 Factory, and GSX-R1000R was resolved with RBF 660.


*EDIT* I should also mention the above is using the stock MCs and rotors also.
 
Flush and fill with fresh brake fluid for sure but you’ll give the whole braking system some longevity with some heat mitigation… ventilated caliper pistons and ducts [emoji106] the latest DP ducts look on point.
 
andyb said:
Maybe believe brembo…BREMBO PRESENTS THE 17 & 15RCS CORSA CORTA
Click to expand...

From your own link…
40d4d34f1caf2a6128cd0840f48bfcbc.jpg

Thank you!
 
A certain amount of hydraulic force is required to be exerted on the calipers pistons to stop the bike. That amount of force doesn't change because you change the master cylinder size. If one master cylinder gets there by moving more fluid at a lower pressure vs less fluid at a higher pressure its all the same to the caliper. The thing that changes is the feeling of the lever to the rider.
 
the key phrase is in the opening paragraph..

To make the braking system of a motorbike work even better, not only in terms of braking power but also of modulation and sensitivity on the lever, the master cylinder must be sized appropriately and ensure the best hydraulic torque ratio; the latter being the relationship between the diameter of the master cylinder piston and the diameter of the caliper pistons.

This means that, depending on the size of the brake caliper pistons of each motorbike model, it is possible to choose the most suitable RCS Corsa Corta master cylinder for a perfect dimensional match with the rest of the braking system.
 
andyb said:
the key phrase is in the opening paragraph..

To make the braking system of a motorbike work even better, not only in terms of braking power but also of modulation and sensitivity on the lever, the master cylinder must be sized appropriately and ensure the best hydraulic torque ratio; the latter being the relationship between the diameter of the master cylinder piston and the diameter of the caliper pistons.

This means that, depending on the size of the brake caliper pistons of each motorbike model, it is possible to choose the most suitable RCS Corsa Corta master cylinder for a perfect dimensional match with the rest of the braking system.
Click to expand...

Key phrase you mention is a vague concept but provides no scientific premise… as in it doesn’t say how.
 

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