A friend of mine just gave me a new brembo front 15 rcs master cyl and im putting it on my 07 919 I'm just wondering if there is a resevoir that will hook directly into the master cyl without using a remote mount. All that I have seen is u have to have a bracket and run a brake line from the resevoir to the cyl and id rather the resevoir plug directly into the master . any help would be appreciated
A friend of mine just gave me a new brembo front 15 rcs master cyl and im putting it on my 07 919 I'm just wondering if there is a resevoir that will hook directly into the master cyl without using a remote mount. All that I have seen is u have to have a bracket and run a brake line from the resevoir to the cyl and id rather the resevoir plug directly into the master . any help would be appreciated
Have you checked to see if the master piston diameter in combination with the lever leverage ratio arrangement is suitable for the slave pistons in the 919 brake calipers ?
What he said. Lol. Search the site. There was a fairly technical discussion on the subject of master cylinder swaps. All I remember from it is that the master you're putting on better be suited to the existing caliper or you could be in for a nasty surprise.
You could always go the clear tube route. Using just a tube. Not much volume to compensate for pad wear but if its clear you can see when it needs filled. Just use a rubber tube about 15mm long, clamped onto the master cylinder's inlet and a plug clamped on the open end. Makes for a clean look. But you gotta watch the level. Custom bike builders to it alot to have minimum unsightlyness on the bars. Racers often use this technique on the rear brakes. Either way, i'm referenceing brakes that dont' get used much. So pad wear isn't much of a concern. But like I said, keep an eye on it andyou should be fine. The biggest pain with this setup is likely going to be bleeding the brakes.
'Romo knows what he is talking about. Don't underestimate the improtance of matching the master cylinder to the calipers. But that said, it will take less time to put it on and try it than it will to look up and understand the math to figure out on paper if it will work as well as anticipated.
ya, like others have stated, bigger or smaller piston size is gonna effect breaking quite a bit.... bigger will make brakes hard and feel like they have less stopping power.... smaller will make breaks reall grippy with no lever feel.
I just kind of related it to my racecar as far as feel goes. It has a 1mm bigger piston but i think ill be able to adjust to the feel. It's worth a shot at least because it is a brand new 250+$master cyl plus it is pretty nice. Thank u for the help I just wanted to see if there was a way because I'm just not real hip on remote resevoir. It is is my first post so thank u also for the welcoming as well !
I just kind of related it to my racecar as far as feel goes. It has a 1mm bigger piston but i think ill be able to adjust to the feel. It's worth a shot at least because it is a brand new 250+$master cyl plus it is pretty nice. Thank u for the help I just wanted to see if there was a way because I'm just not real hip on remote resevoir. It is is my first post so thank u also for the welcoming as well !
1mm bigger shouldnt be too much of an issue... lever feel will get a little harder if all the other dimensions are the same.... though it could be EASILY offset if the distance from the lever pivot point to the point where the master cyclinder gets pushed in by the lever is smaller compared to the same distance on the stocker.
Id say give it a try just get a slow feel for the breaks at first (dont go grabbing a shit ton, and dont go hot into a corner) untill you really know how its gonna stop with the change.
Why people think the 919s brakes are not good enough is beyond me. Unless your master cylinder is hosed, why are you "upgrading"?
cool factor!!!
i will agree the 919's stock breaks are damn good ESPECIALLY when you pair em with a nice set of stainless steel lines... soon as i put my GnJ lines on lever feel was SO much better... its SO easy to pull long rolling stoppies now.
You could always go the clear tube route. Using just a tube. Not much volume to compensate for pad wear but if its clear you can see when it needs filled. Just use a rubber tube about 15mm long, clamped onto the master cylinder's inlet and a plug clamped on the open end. Makes for a clean look.
I'm trying to picture this setup in my mind...what do you do with the tube, to keep it dressed and out of the way? zip-tie it to the bars? 15mm isn't very long...would that hold enough fluid volume?
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Well, fire the engines! Spur this iron space-pony on!
Why people think the 919s brakes are not good enough is beyond me. Unless your master cylinder is hosed, why are you "upgrading"?
Why change the exhaust, why change the bars ,why change anything on a bike because its fun . That's half the fun of having a bike is making it your own not to mention brembo is by far the best brake manufacture in the world.
HIR99
LDH sells Brembo. He can supply you with everything you need.
You will also need a brake switch or a pressure switch.
If you are looking for better brakes, meaning aggressive, get more aggressive pads, Vesrah RJL, Performance Friction or Carbon Moraine.
Remember aggressive brakes in limited traction situation is not a lot of fun. If you use your bike in all weather conditions be careful in your brake component selections.
Within the confines of stock rotors and calipers, the ONLY thing that can increase absolute braking power for any given pressure acting upon the slave pistons, is pads.
Substituting F4i calipers gets you larger pads, and therefore an additional increase in absolute braking power. Other Honda calipers doing the same thing can also be retrofitted.
Past that, it's bigger rotors, which is not an easy do on a 919 if one is sticking to stock fork legs and front wheel.
There's an improved efficiency element from the use of braided lines, think of it in terms of reduced "lost energy" in terms of the lever pressure applied. Once you get past that, the rest of the improvement is "feel".
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