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Discussion Starter · #1 ·
Hi guys, new to this forum after long time lurking around. I’m from Oz and had a few gixxers in my time.
Reason for this post, after searching around I can’t find an answer.

Just bit the bullet and installed M4 Brembo calipers on my k9 600 (genuine units not late model Brembo). Bike has braided lines, brembo supersport rotors, Accosato 19mm MC.

Bled the crap out them, done all the tricks, I’m just finding I have a lot of lever play before initial bite compared to the tokico units.

Anyone that’s installed these and running a similar 19mm MC find this is typical? I’m assuming due to the piston size increase it could be just how things are. Quick test ride and damn that rear wheel nearly wants to come off the ground so my braking markers are going to change.
In the pics you’ll see where the lever sits with the zip tie, that’s basically the point the pads grab.
 

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I’m assuming due to the piston size increase it could be just how things are.
That's what it sounds like to me. When I stuck a Brembo 19x18 master cylinder on my 03 SV650 it changed the brake lever feel (and power) due to the ratio between the master cylinder and caliper pistons changing so dramatically.

There are online calculators that can help find a ratio to get it back to where it was if you want, or you can get used to what you have now. Personally, I like a softer lever; other folks prefer a firm lever. If you try it out and just really don't like the new feel, the only option is swapping master cylinders to restore the original ratio.
 

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Discussion Starter · #3 ·
Brembo recommend the 19RCS with these calipers (which my Accosato is same spec). Don’t get me wrong, I think if I pull the lever back as far as I have in the photo I’ll be flipping the bike.
See how it goes in a few weeks when I’m back at the track, sure I’ll get used to it.
 

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Hey there.
I've recently put the K9 1000 'monoblocks' calipers on my K51000. I was using the K5 MC- I think is 19mm. It was OK. I then got a K9 MC- 17mm. It seems to stop about the same.

It bothers me b/c there is a LOT of play before it 'bites' Like more than that picture of your zip tie.
When it does, it stops fine. Yes, I can lift the rear if I want to too.
It never hits the bar, but with gloves on and my last 2 fingers on the bar- it touches my finger when braking.
Yes, I've tracked it too this last season.

I didn't rebuild any of these used components, just stuck them on.
I have a nice MC rebuild kit- winter project.
I'm pretty sure I'm also going to get some kits and rebuild the calipers too.
I have messed with them and sprayed silicone on the pistons, etc.
They were sticking badly when I first put the calipers on.

I'm using the EBC HH sintered pads. I like them and they seem to last a long time too.

SO OP, your ?, is this typical? For me it seems to be, slightly different set up it seems though.
And yes, I've bled them every which way till Sunday too!
If you pump the lever, it doesn't tighten up- like it often does if there's air in it.

HTH?
 
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I ran the M4 with a 19mm brembo MC (billet 19x18). Best set up I've had. The pull was super short. Great feel and power with vesrah XX pads.
The M4 do have aluminum pistons and I've had a little fade at the track when I brake really hard. Lap after lap. Versus higher spec brembo race calipers with Ti pistons.

The "dead space" before initial bite is why I don't use the RCS on my trackbike. That slop is just not to my taste.
 

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Discussion Starter · #6 ·
Thanks for the replies, very helpful. I’ll give it a go in a few weeks time and see how things feel. Maybe once the z04’s are scrubbed and I get some decent heat into them I may get some more feeling. If not might swap some mc’s with mates and see if I can find the right combo.
 

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The corsa corta version of brembo mc is supposed to be adjustable for that dead space however, I tend to stay away from those adjustable mc's. Usually I find a setting I like and never change.

The z04 are hard biting pads. Great power but a little grabby on initial application for me on the streets. Pads are expensive but try out the vesrah XX pads.
 
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