My knowledge here is limited, but I will give it my best shot.

The smaller the diameter the piston, the more "touchy" the brakes will be. Meaning with a smaller piston, you will apply more pressure to the brake pads with the same lever travel. Another way of saying that is you will need less lever movement to apply the same ammount of pressure at the pads. the piston size is the second number you see, either 18mm or 20mm.

I believe, but really am not sure, that the first number will be a measurement of how far the piston can travel, either 16mm or 19mm.

 

Yeah that's what I was wondering, performance related measurements. Think I'm doing more research on this one,

Thanks JAYSTENSEC4CYL !

 

The wrench heads will come after me but unless your going racing or just want a diff. look (or ya broke it) the master cyl.s on your bike are excellent. Not to mention their made by brembo. You could do rotors, lines, calipers all and not have to change it! I do it for the look and feel but one of the things Yam.s are known for are their top notch stock brakes.

 

I am doing both actually, mostly performance and some looks. Not planning any racing but track days are a must. I noticed the Brembo logo on the stock MC, very good I agree. Just want to build this one with all the best parts :sneaky been wanting to do this for MANY years and not getting any younger.
I have already ordered the lines (Goodridge Carboline Brake Lines) and calipers Brembo Radial Caliper Kit HP) . The MC and Rotors are todays project (maybe, wife needs to be gone long enough :bandit ) .

thanks gypsyjack !

 

Nice caliper kit! Let us know how that goes. I put brembos on my R6 for a third of what that HP kit costs. I was surprised (maybe not) that something less exspensive wasn't available. Ohlins internals were 250 for the 6. Cartriges for the R1 are 1600. Guess I've moved up to SUPER superbike.Im thinkin' it. 1500 for calipers that need adapters? I might wait till I can afford Forks.

 

Yeah, I should have metioned that I have these waiting in the garage.

So the Calipers are matched up for this app. By the way your 6 is Very Nice:thumbup

 

The short answer: Get the 19x18 forged.

The longer answer:

The first number is the diameter of the master cylinder's bore. It is important that this be balanced to the cylinder volume of the caliper(s). For most modern twin disc setups, the 19mm bore is the best fit. If you were running a single disc, the 16mm might work better.

The second number is the distance between the pivot point and the cylinder's piston. The larger this number is, the less force you can apply to the piston and the shorter the lever throw will be. Just like being in a higher gear on a pedal bike: the effort on your part is much higher, but the distance you have to move the pedals (in relation to forward movement) is much shorter. The 18mm will give probably the best balance of feel and power. The 20mm will give you a firmer brake lever that doesn't feel as linear between lever effort and stopping distance.

 

Also note that a larger bore and bigger pivot point gives better feedback or feel than a smaller bore and smaller pivot point, but less outright braking power. Theres a give and take relationship here.

 

The 19x18 will give you better " feel " control and or modulation, whichever word you connect with best. The 19x20 will have better ultimate power but at the expense of " feel"

Nope, you guys have both got it backwards...

If you increase either the bore diameter or the pivot distance, the result is a reduction in outright braking force, plus a reduction in lever travel.

 

Or you could get the new Brembo RCS master which will give you a choice:
http://www.oppracing.com/pages/articles_brembo_19rcs_brake_master_cylinder/

IMHO, Brembo billet is the only way to go. Their forgings are a step up from the cast but for $50 more, you can get the billet offerings which are of much higher quality than the cast or the forged. Billet stuff has a red Brembo symbol on the handlebar clamp cap where the forgings are white.

I have no experience with the RCS stuff as it's brand new.

 

NOW that's the one I found at a place in Italy. Thinking that's the right choice so far.

 

The 19x18 will give you better " feel " control and or modulation, whichever word you connect with best. The 19x20 will have better ultimate power but at the expense of " feel"
I have to agree if you have the bucks I'd go for the new RCS which gives you the ability to switch back and forth...... but I'll bet it comes with a high price tag...... probably close to $375 - $400 ( but I'm guessing on that one )

 

And I wonder that I over think things! You guys are too damn smart!

 

Poorly worded on my part...... I just re-read you original post, it is indeed correct. My bad

 

No prob, with this kind of stuff, it's easy enough be thinking one thing and type another. I know it happens to me sometimes! :dundun:


I just sent OPP an email about the masters they sell. Almost every configuration has a reasonably priced billet version... except the 19x18. The only billet 19x18 they list is the $2500 version. I want to know what the hell justifies that price! It can't just be the different lever with 90* adjuster position.

 

I'm sure there's more.... but it still ain't worth $2500........

$400 for the new RCS ain't too bad if you were going to run it on a street bike...... I don't think I'll be running out to buy one anytime soon though.

 

not going to say much just: 19 x 18 is what you want.

thanks all thanks :lol

 

can I assume also if you get one of these master cylinders for use with your street bike you will also need to order a double line banjo bolt with a built in pressure sensor to make the brake lights work?

 

Yup, assuming you are running steel lines. No pressure switch needed if you get your hands on an RCS though.

 

yea I am not quite that cool Five Damn it thats another part I need to get my bike rolling !!

 

I can't really understand them putting that microswitch on the RCS though. It seems like a race part to me. The adjustable pivot point and 90* lever adjust don't seem to have any value for a street rider. For a racer though, adjusting the pivot for different tracks would be really nice and the lever adjust pointed left means your remote adjuster cable has a straight shot and would work MUCH better.

I wants...

 

seems like it would be really good for an endurance bike where you have different riders hoping on and off...

 

That would definately be a big benefit !!

 

OK I hate to do this to you YaRight, but step down from your super baller status and look at life on my level...lmao

I don't have $350!! I already bought a used Brembo from a forum member (19x18), have my blue Galfer lines on order for the front and rear, need to order a pressure switch, and just last night realized the 02-03 rear rotors, while possible the same diameter as the later bikes, does not bolt up to my 07 rear wheel!! dang it!!

Now I need to come up with another $120 to get a rear rotor for this thing so I can RIDE IT!!! I freaking have spent a TON of money (for me you ballers you) to get these wheels and forks on my bike, and I am not even ridable yet...lol

 

Now I need to come up with another $120 to get a rear rotor for this thing so I can RIDE IT!!! I freaking have spent a TON of money (for me you ballers you) to get these wheels and forks on my bike, and I am not even ridable yet...lol

Who needs a rear brake when you have a Brembo master? :dunno


:crash

 

I do...lol How else you gonna lock up the rear and spin the bike 180 to impress your friends? lol

 

Thanks YaRight. I am just gonna get a galfer, it's what I want anyway, and for only $120 I would rather get it and be done with the rear at least.

Still in the future want to get the galfer's for the front, maybe even the superbike rotors if I win the lotto...lol

Hell I don't even have a front fender at this point and I could really care less. LOL

I love the look of the wheels on the bike, but them being black is killing me. My old wheels were custom painted yamaha blue on the hub and spokes and have polished lips, matched the bike very well indeed. But to make the new wheels look like that is another $500 or so, and I just don't have it right now.

 

Learn to love the Krylon !! ( lol )

 

duel bore M/C's should be required for racing.

and if that happened they would come on factory bikes, not bad for any of us really.

 

:corn

 

I quess I didn't explain it well enough or I explained it to the point of it getting convoluted. I was simply talking about why a larger bore master is said to have better feel. I do know where your coming from with your explaination.

 

I know that "feel", like I mentioned, is pretty subjective. But if you type in "19x18 19x20 better feel" into google, you'll see that the consensus among forums agrees that the 19x18 has "better feel".

 

Maybe a better way to say it is that..... since there is more leverage with the 19x18 because the fulcrum if you will is closer to the " weight " you have a much better ability to manipulate the amount of force being applied to the brakes with everything else that's going on at this point in the very dynamic situation that occurs during heavy braking...... hence the term most often used " feel " which might be better described as " control " ??

 

To everyone who replied and helped me, THANK YOU

I decided to go with this: The Brembo Radial jointed brake master cylinder 19RCS

It had everything I wanted and after reading everything you guys said it was the clear choice for me, thanks again to all of you :thumbup

 

that master cylinder is PIMP man Cool part, should serve you well.

 

In all honesty, unless your mainly using your bike on the track and your seriously quick, the stock brakes (bar pads) are more then enough.

But if you have money to burn and dont care, it is a very good mod even though the 07 has awsome brakes stock.

If I had to choose, I would probably buy an ISR MC, the whole thing is billet and instead of being either 19 or 20 you can have it from 17 to 20. Which would be perfect for street bikes that are also used on the track

 

Anyone has bought Brembo RCS19 GP Radial Pump brake master cylinder? Any comments?