V4 Brake MC

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If we're talking about volume of fluid, m/c size shouldn't matter (to ABS). The caliper, is more important. I would guess, the pump knows how to control the caliper, and is controlled by the six axis IMU, pressure from the M/C, and the ABS rings.
If you have a different sized M/C, to operate the caliper, the same volume of fluid needs to move, to operate the calipers as desired. The only thing that would change, is the amount of lever movement, required to move the same volume of fluid, with the new M/C volume.
And, as it's fairly commonplace for riders to swap out the M/C, you would imagine, it would be dangerous to design a system that fails, if a M/C is changed.
Although, we must remember, Italian engineering.
 
RickD996 said:
If we're talking about volume of fluid, m/c size shouldn't matter (to ABS). The caliper, is more important. I would guess, the pump knows how to control the caliper, and is controlled by the six axis IMU, pressure from the M/C, and the ABS rings.
If you have a different sized M/C, to operate the caliper, the same volume of fluid needs to move, to operate the calipers as desired. The only thing that would change, is the amount of lever movement, required to move the same volume of fluid, with the new M/C volume.
And, as it's fairly commonplace for riders to swap out the M/C, you would imagine, it would be dangerous to design a system that fails, if a M/C is changed.
Although, we must remember, Italian engineering.
Click to expand...

I assume on a familiar logic. The ABS relies on incoming pressure to operate, to do its thing. It could even use its pump to suck fluid from the supply line… but if there’s not enough pressure coming from the supply (the MC) then there’s probably not enough pressure to lock the brakes.
 
Alkhater said:
I assume on a familiar logic. The ABS relies on incoming pressure to operate, to do its thing. It could even use its pump to suck fluid from the supply line… but if there’s not enough pressure coming from the supply (the MC) then there’s probably not enough pressure to lock the brakes.
Click to expand...

Absolutely. I can't see how the volume, or pressure, of the incoming fluid from the M/C changes. You just move the piston in the M/C more, or less, to have the desired effect at the caliper. ABS doesn't need to know how much lever travel is.
 
I'm running standard master cylinder and calipers on a 2020 V4. Good fluid (SRF), pads and tdrives.
Feels pretty good, although the lever is slightly soft.
Is the standard m/cylinder a 16 or a 17mm bore?
I'm thinking of the RCS17, any incremental improvements? Slightly firmer? A lot of people have them it seems.
I'm not sold on the virtues of the Costa Coffee fancy version... been riding bikes long enough to know how to adjust braking in the wet (although it's track only and no wet laps planned). Happy to be convinced otherwise.
I have looked at other threads, but have not seen an objective comparison really vs standard.
Thanks
 
cl955 said:
I'm running standard master cylinder and calipers on a 2020 V4. Good fluid (SRF), pads and tdrives.
Feels pretty good, although the lever is slightly soft.
Is the standard m/cylinder a 16 or a 17mm bore?
I'm thinking of the RCS17, any incremental improvements? Slightly firmer? A lot of people have them it seems.
I'm not sold on the virtues of the Costa Coffee fancy version... been riding bikes long enough to know how to adjust braking in the wet (although it's track only and no wet laps planned). Happy to be convinced otherwise.
I have looked at other threads, but have not seen an objective comparison really vs standard.
Thanks
Click to expand...

I’d suggest quality brake lines first if you’re after a firmer feel at the lever.
 
cl955 said:
Thanks, are the standard ones no good? Aren't they braided steel?
Any recommendations?
Click to expand...

Are you planning on bypassing the ABS? I ran with ABS for a reasonably long time, before bypassing. The ABS was very, very good. But, when close to the tyre's limit, it was a little conservative, and made lever feel inconsistent.
So, if you're bypassing, getting HEL lines from reactiveparts.com, is a very easy solution for you.
 
RickD996 said:
Are you planning on bypassing the ABS? I ran with ABS for a reasonably long time, before bypassing. The ABS was very, very good. But, when close to the tyre's limit, it was a little conservative, and made lever feel inconsistent.
So, if you're bypassing, getting HEL lines from reactiveparts.com, is a very easy solution for you.
Click to expand...

Thanks Rick. No plans to bypass the abs at the moment.
Only time that I got a weird feeling from the front was last November at Portimao, braking into turn 5... it was as though the tyre hit something greasy: not sure if it was the abs kicking in or the back wheel lifting a bit. Luckily, I was able to go straight on where the cars go and didn't hit anyone.
Otherwise, with the SBS DS1s and the T drives, brakes seem very good.

If the RCS 17 isn't going to give me a firmer level or more feel (standard really is pretty good), then I'll probably leave all well alone.
 
If you want a different feel, the bit you need to focus on is the lever ratio not the bore of the master cylinder. changing from the std the say a 17RCS is the correct bore for your std system, but you get the option to run it at either 18 or 20 lever ratio. less travel firmer feel or more travel more progressive feel......
 
cl955 said:
Thanks Rick. No plans to bypass the abs at the moment.
Only time that I got a weird feeling from the front was last November at Portimao, braking into turn 5... it was as though the tyre hit something greasy: not sure if it was the abs kicking in or the back wheel lifting a bit. Luckily, I was able to go straight on where the cars go and didn't hit anyone.
Otherwise, with the SBS DS1s and the T drives, brakes seem very good.

If the RCS 17 isn't going to give me a firmer level or more feel (standard really is pretty good), then I'll probably leave all well alone.
Click to expand...

Yeah, you won't get any, intrinsic gain, from the brake lines. The stock lines are braided, or solid metal.

T5 (right hander after the long slow left?Or, the long slow left, off camber) at Portimao, isn't an especially hard braking corner. The stock ABS, is pretty amazing, you 100% won't feel anything at the lever, more, a kind of feeling, that the bike's not quite doing what you're asking, from the brakes. If (pretty sure you did) you had this feeling, that's the ABS, and bypassing it will be your friend.
Brake lines from Reactiveparts.com, and a couple of bolts in the ABS unit.

Although, word on the street, JetPrime MAY have an ABS delete dongle on the way....
 
The RCS is also forged, I’m not sure if the stock MC is. If the stock MC is cast then going forged might aid in achieving a firmer feeling.

I have the corsa corta variant and it does feel better than stock. I can’t say in detail how it feels better because I haven’t tracked my bike yet.
 

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