View Full Version : SV Master Cylinder Ratio
What is the ratio of the front & rear master cylinders on the SV??
My front sez 5/8, rear I dunno. Why you ask?
Why on earth do you want to know that?
Have you never thought of putting a diffrent MC on you front brake to make it sharper & less travel?? For this you need to know the ratio. I was looking at a fireblade MC but because of the year its a 5/8 one, which possably means it will be no diffrent to the SV one.
You're preachin' to the choir. I have very little travel on my stock set up, if it's bled right you can't improve it much more by swopping the M/cyl.
I have hardly any travel on mine either, its more when you come to brake.
Its hard to explain. Its a mod that some people do. I am thinking of tring it, if i dont like it, i change it back and sell what i bought. I am not getting anything expensive just MCs from other bikes.
I have hardly any travel on mine either, its more when you come to brake.
Its hard to explain. Its a mod that some people do. I am thinking of tring it, if i dont like it, i change it back and sell what i bought. I am not getting anything expensive just MCs from other bikes.
You want a nice radial one from a recent superbike, or a radial brembo from a 999 :D
21QUEST
12-09-05, 04:57 PM
The ratio is on the master cylinder but as burner says it 5/8.
Ratio is not the only that matters with a master cylinder though. The piston travel , pivot makes a difference.
Some people prefer little travel , some more travel (initial). Personally I like more initial travel as I can modulate the brakes better that way(I brake while turning in). You got to try it and see if you like the change.
I used a CBR600RR master cylinder with the standard caliper for a little while and loved it. Now using it on my 750 end an dit's sweet. Had previuosly tried a fireblade one(200-2001) with GSXR600 SRAD caliper but did not like the way it felt.
A lot is rider preference although you can of course go too far either way.
Since I one for mucking about with stuff on the bike I've got a few knocking around(too many :roll: ). Got time on your hand :) then I've got a TL , fireblade , GSXR1000K3 SV1000 ones you can try out if interested. That should keep you busy :lol: All you have to do is pay the postage or pick them up.
Cheers
Ben
Sid Squid
12-09-05, 05:23 PM
The 5/8 marking is an Imperial measurement - 5/8ths of an inch - not the ratio, the ratio is a word used for the relationship between the master cylinder diameter and the caliper piston diameters, and also for the mechanical advantage the the lever has over the m/cyl piston, that is; the distance between the lever pivot and the piston.
For any given system using a larger diameter m/cyl will result in less lever travel, but for any given brake pressure you'll need to squeeze the lever harder, a smaller diameter m/cyl will do the reverse - for any given brake pressure you'll need to pull the lever further but not as hard.
Do you want sharper, (by this I assume you mean better brake pressure for any given lever pressure, is that right?), or do you want less travel? All else being equal, you can have one or the other by changing the m/cyl for larger or smaller.
21QUEST
12-09-05, 05:53 PM
The 5/8 marking is an Imperial measurement - 5/8ths of an inch - not the ratio,.
You are quite right I meant to say bore size. Apart from that we are sayng the same thing :P
Cheers
Ben
Mr Squid has hit the nail on the head again I think... you can't change one, and expect the other to be better - basic levers. If you think the SV's brakes are crap, then it's probably because they're basic floating calipers, as opposed to opposed pistons.
Even so, I've never ever thought that my SV's brakes were rubbish.
Itching 2 go
12-09-05, 08:18 PM
you can indeed change both piston size and ratio, you can do this when you buy either a brembo or magura radial mastercylinder. or infact I would imagine any top level mc, they come in all different sizes and finishes, billet or cast, its your choice but then you do pay for it
northwind
09-11-05, 12:21 AM
I thoink I said this in the post-crash version of this thread, but if I did it's gone. I've got a Brembo radial on mine, and I wouldn't dream of going back. True, it's pushing different calipers but it's simply a superior item. The design's better- the vertical banjo prevents air pockets, and it has an integral bleed nipple. It takes the Suzuki brake switch, so no messing around with pressure banjo switches...
The thing is, mine isn't the superbike one- I got it cheap, and it turned out to be the one they sell for a single caliper, 4 or 6 pots. It's a 16mm bore by, I think, 18mm. Now, that's pretty much exactly what the SV is, but the Brembo still works better. It's more linear, whereas the SV one never was for me, even with stainles lines- it was always bit of brake, bit of brake, lot of brake. On the other hand, with the Brembo each bit of movement gives a very linear brake "curve"- bit of brake, bit more brake, yet more brake, lots. This makes fairly little sense from a simple lever engineering point of view, but it works.
It doesn't give me any more power- SV brakes will lock the front in the dry, you don't need more power- but it delivers that power so much better. And it was £50. And it looks ace :) The only thing I'd say is it might not fit well with a curvy fairing- it sticks out further fowards and gave me fits when i first fitted it.
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