BMW S1000rr master cylinder on 954? - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

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post #1 of 22 Old 12-23-2012, 4:08 PM Thread Starter
 
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BMW S1000rr master cylinder on 954?

I know the bmw has a radial mc and they are cheap on ebay ($100). But would it be worth it? Say vs a brembo 19x18? Would it fit the 954 with minor mods?

Just a thought for the winter project.
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post #2 of 22 Old 12-23-2012, 9:32 PM
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Re: BMW S1000rr master cylinder on 954?

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Originally Posted by CMFM22 View Post
I know the bmw has a radial mc and they are cheap on ebay ($100). But would it be worth it? Say vs a brembo 19x18? Would it fit the 954 with minor mods?

Just a thought for the winter project.

Whether it'd be worth it depends on what you expect from it. For general road use I would say no, on the race track you might feel some benefit.
As long as it fits into the available space you can run whatever master cylinder you like, I put an F4i front master on my GPX250R for example.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #3 of 22 Old 12-23-2012, 11:32 PM
 
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Re: BMW S1000rr master cylinder on 954?

I agree, for road use there is no beneficial gain from upgrading your MC.

If you just want it for the sake of saying "Yeah I have upgraded brakes" Then go for the Brembo.. as thats always nice to say.

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post #4 of 22 Old 12-24-2012, 5:41 AM
 
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Re: BMW S1000rr master cylinder on 954?

Sorry fot the hijack, saves me opening another thread! I have a few track days booked for next year, is there a particular model recommended for the 954?
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post #5 of 22 Old 12-24-2012, 9:23 AM
 
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Re: BMW S1000rr master cylinder on 954?

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Sorry fot the hijack, saves me opening another thread! I have a few track days booked for next year, is there a particular model recommended for the 954?
No, the 954 brakes are some of the best ever to come on a stock motorcyle, there is no need to change anything. I actually use an 08 r6 master on my gsxr, because it's a Brembo. It's not going to make you stop any faster, it is mostly for feel.
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post #6 of 22 Old 12-24-2012, 7:18 PM
 
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Re: BMW S1000rr master cylinder on 954?

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No, the 954 brakes are some of the best ever to come on a stock motorcyle, there is no need to change anything. I actually use an 08 r6 master on my gsxr, because it's a Brembo. It's not going to make you stop any faster, it is mostly for feel.
The R6 master is pretty common for people to put on their bikes.

It is brembo, but still not as good as buying a non-oem brembo.

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post #7 of 22 Old 12-24-2012, 7:47 PM
 
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Re: BMW S1000rr master cylinder on 954?

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It is brembo, but still not as good as buying a non-oem brembo.
Ohhhh is that why the Am Brembo is $300....Never would have guessed it.
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post #8 of 22 Old 12-24-2012, 8:58 PM
 
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Re: BMW S1000rr master cylinder on 954?

Next spring might be bringing in a Brembo MC for sure, if not more..

James Taylor
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post #9 of 22 Old 12-25-2012, 9:47 AM
 
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Re: BMW S1000rr master cylinder on 954?

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Whether it'd be worth it depends on what you expect from it. For general road use I would say no, on the race track you might feel some benefit.
As long as it fits into the available space you can run whatever master cylinder you like, I put an F4i front master on my GPX250R for example.
You put a 5/8" master meant for two large modern calipers, on a gpx250 with one small caliper that's normally operated by a 1/2" master? Bet it fells like an on off switch and frequently leaves you accidentally locking the front wheel.
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post #10 of 22 Old 12-25-2012, 10:02 AM
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Re: BMW S1000rr master cylinder on 954?

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You put a 5/8" master meant for two large modern calipers, on a gpx250 with one small caliper that's normally operated by a 1/2" master? Bet it fells like an on off switch and frequently leaves you accidentally locking the front wheel.

Not at all, it works just fine, as you'd expect.
I would say it actually feels better than the original.
Try it yourself sometime :-)

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post #11 of 22 Old 12-25-2012, 12:29 PM
 
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Re: BMW S1000rr master cylinder on 954?

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Not at all, it works just fine, as you'd expect.
I would say it actually feels better than the original.
Try it yourself sometime :-)
My history of playing with front brakes:
Xj600s 14 down to 1/2"
T595 14 up to 5/8"
T595 rear 14 down to 1/2"
96 900rr on 750k2 calipers 14 up to 5/8"

I'd say I have enough experience to know what I'm on about?

Only one I didn't keep was cb-1 11 up to 1/2" which was an emergency fix and was rubbish.

Happy chrimbo all.
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post #12 of 22 Old 12-25-2012, 10:09 PM
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Re: BMW S1000rr master cylinder on 954?

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Originally Posted by amorti View Post
My history of playing with front brakes:
Xj600s 14 down to 1/2"
T595 14 up to 5/8"
T595 rear 14 down to 1/2"
96 900rr on 750k2 calipers 14 up to 5/8"

I'd say I have enough experience to know what I'm on about?

Only one I didn't keep was cb-1 11 up to 1/2" which was an emergency fix and was rubbish.

Happy chrimbo all.

Then if you have that experience why would you have made the silly statement about it not working on the GPX?

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #13 of 22 Old 12-25-2012, 10:16 PM
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Re: BMW S1000rr master cylinder on 954?

Five of us have spent time on the bike since I built it.
The bike has two foibles, very limited steering lock due to the much lower RG250 clip-ons I fitted, and the soggy shock common to all GPX250R's - nobody has compained about the brakes at all. My brother-in-law initially complained about the bars being too low but soon got used to it, the lower clip-ons are much more comfortable easily off-setting the minor annoyance of larger turning circles in carparks.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #14 of 22 Old 12-26-2012, 7:19 AM
 
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Re: BMW S1000rr master cylinder on 954?

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Then if you have that experience why would you have made the silly statement about it not working on the GPX?
Add up the surface areas of a single caliper brake system, divide by the surface area of the master cylinder. For spot on brakes you're aiming for about 24:1, which is about what my divvy with 1/2" nissin, cb-1 with nissin system (stock) and 11mm and cagiva 125 with brembo (stock) gold line and 13 all were. I could go on with a list of bikes with sweet brake systems that may this ratio.

Yours is going to be WAY wide of this mark. If you care to measure or publish the diameters of your caliper pistons I'll be happy to do some maths for you. If you then test my ratio but prefer yours I'd be surprised but admit error. As it is I've tried so many systems with mods and know what's right for by far the most people.
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post #15 of 22 Old 12-26-2012, 7:36 AM
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Re: BMW S1000rr master cylinder on 954?

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Originally Posted by amorti View Post
Add up the surface areas of a single caliper brake system, divide by the surface area of the master cylinder. For spot on brakes you're aiming for about 24:1, which is about what my divvy with 1/2" nissin, cb-1 with nissin system (stock) and 11mm and cagiva 125 with brembo (stock) gold line and 13 all were. I could go on with a list of bikes with sweet brake systems that may this ratio.

Yours is going to be WAY wide of this mark. If you care to measure or publish the diameters of your caliper pistons I'll be happy to do some maths for you. If you then test my ratio but prefer yours I'd be surprised but admit error. As it is I've tried so many systems with mods and know what's right for by far the most people.

What would be the purpose of making such a calculation if the brakes work just fine for all of us that have tried them?

The F4i is a 16mm master pushing four 34mm and four 32mm pistons.
I don't have specs for the GPX250R handy but it is a single sliding two-piston caliper, probably around 30mm pistons.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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