My $710 Ducati/Brembo kit is discontinued, so I'm looking for alternatives...
First: yes, I know about 4 pads, GP radial masters and all that wonderful stuff - but, all I need is a budget friendly package. My eyes are on the S2R 1000 stock brakes/similar (no, I don't want to buy used parts from here and there).
Best offer so far is around $1100 for 320 rotors, Goldline 4 pistons 2 pads, new larger coffin master and lines.
THE QUESTIONS:
Bore & stroke - I'm assuming I don't have to think about stroke - all masters have sufficient stroke? Bore is of more importance, right? My own master is 15mm, right(?) - that's ok for the 2 piston POS stock brakes, yes? Will the larger coffin master - 16mm bore - be ok for the 4 piston calipers. If I understand this bore-thing, I will get a quicker/harder brake response if I get 18, 19 or 20mm bore master pistons, yes? Am I correct if I look at bigger bores as "racing" and smaller bores as street/wet friendly - as in longer lever travel, easier to modulate?
Fire away - correct me if I've got this all wrong [thumbsup]
I think you got it, you confuseled me a little. Smaller the bore of the master increases force (reduces your effort) at the expense of increased lever travel. In an extreme case, you may not have enough fluid. The twin disc 320 mm rotors used 16 mm masters, the single disc 320 mms used 13 mm. Your 15 mm will have a little more travel, but you may be happy. Modulation, to some extent, is personal preference. If I were to change to 16mm I would go for the gold line with the pee cups. You might want to speak to Fred at http://www.yoyodyneti.com (http://www.yoyodyneti.com) He is more than a retailer. He knows his stuff.
I have a goldline master sitting in a box....
Howie, thanks for taking the time, even if you were confuseladed..... So, you're saying that 15 to 16mm might not be required? I guess I could try this with the 15mm I've got and see what happens. Calling that Yo-place seems smart [thumbsup]
Nakid, what's that low price radial master doing in a box, waiting for a new home? Picture/link?
Quote from: stopintime on July 25, 2009, 11:54:42 PM
Howie, thanks for taking the time, even if you were confuseladed..... So, you're saying that 15 to 16mm might not be required? I guess I could try this with the 15mm I've got and see what happens. Calling that Yo-place seems smart [thumbsup]
Nakid, what's that low price radial master doing in a box, waiting for a new home? Picture/link?
What I said is you might want to try it. A 3 mm. bore difference is much more significant than 1 mm. Travel will be longer and application force will be less.
(With standard/goldline 4 piston calipers)
The 15mm master will work. Lever feel is a little mushy for me though, but it does work.
I like the 16mm better. Lever feel is a bit more solid.
The S2R800 measurement of 15mm is just what I've heard - is that a confirmed number?
DarkStar: so, you have experience with both - good to hear [thumbsup] What do you think about 18mm then?
Quote from: stopintime on July 26, 2009, 08:01:27 AM
The S2R800 measurement of 15mm is just what I've heard - is that a confirmed number?
DarkStar: so, you have experience with both - good to hear [thumbsup] What do you think about 18mm then?
The 2 piston caliper monsters "usually" have the 15mm master...
Sorry no experience with the 18mm master. The 16mm master is good enough.
OK I know I am a little late on this.
I have an '05 S2R and have upgraded the brakes ... a bit. I changed the rotors (to 320mm) with new lines and (pre-loved) 4 pad calipers ... but I left the master cylinders as stock.
I was in a similar boat to you, could have opted for the DP pack (not quite so cheap in Australia) but decided to do somehing a little different. I did some reading and spoke to a few people and decided the stock master cylinder was worth a gamble.
My suspicions were confirmed and I have more than enough braking which I can regulate with a longer lever travel ... considering I don't trust my riding ability too much it is a nice compromise for me.
As mentioned above be mindful of the fluids - with plenty of travel you don't want any air in the system, it will 'seem' spongy enough. I didn't do the work myself (although I am now competent enough to add fuel all by myself) and the mechanic said he had a hard time getting the system right with so many pistons to move with the little master cylinder.
So ... yes, you should be able to keep the stock master cylinder but the result may not be quite what you were after.
As I recall, we use a 19mm bore radial unit. I can check to be sure if anyone wants me to.
Quote from: Norm on August 04, 2009, 05:17:23 AM
As I recall, we use a 19mm bore radial unit. I can check to be sure if anyone wants me to.
19mm instead of 15/16mm? What do you use it for - I mean which bike and what kind of brakes? Opinion, please [thumbsup]