Master Cylinder Suggestions - SV1000 Portal
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post #1 of 16 (permalink) Old 6th September 2019, 05:12 AM Thread Starter
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Master Cylinder Suggestions

Hey guys....

I have a 06 GSX-R front end with the Tokico's and the OEM master cylinder...

I am having a little issue with the brakes, in that occasionally the lever loses a lot of its firmness.. meaning, the lever sinks way closer to the bar, and there is less braking force....

I put a kit in the MC at the start of last year, and at the time, i did notice a discolouration on part of the bore, possible moisture stain?
But being a little on edge (read, wanting to ride) i used the kit, and all has been well....
Now, unless this area has abraded the seals, the only other thing that MIGHT be an issue is maybe the spring has lost a bit of oomph....and isn't returning the piston to its place as readily....

So, stew on that, but also, are there any suggestions for a better MC with bottom exit brake lines (dont want to have to replace the new ones on it). And Also preferable with the same lever fitment....again, not wanting to replace them if i can help it.........

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post #2 of 16 (permalink) Old 6th September 2019, 06:33 PM
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Quote:
Originally Posted by Missing Link View Post
Hey guys....



I have a 06 GSX-R front end with the Tokico's and the OEM master cylinder...



I am having a little issue with the brakes, in that occasionally the lever loses a lot of its firmness.. meaning, the lever sinks way closer to the bar, and there is less braking force....



I put a kit in the MC at the start of last year, and at the time, i did notice a discolouration on part of the bore, possible moisture stain?

But being a little on edge (read, wanting to ride) i used the kit, and all has been well....

Now, unless this area has abraded the seals, the only other thing that MIGHT be an issue is maybe the spring has lost a bit of oomph....and isn't returning the piston to its place as readily....



So, stew on that, but also, are there any suggestions for a better MC with bottom exit brake lines (dont want to have to replace the new ones on it). And Also preferable with the same lever fitment....again, not wanting to replace them if i can help it.........


Is the master one of the recall units? From your description it could be as I thought the bores in some cases were showing corrosion.
-ms


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post #3 of 16 (permalink) Old 9th September 2019, 12:33 AM Thread Starter
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It could be, but, me thinks it might be past the recall period... HA HA....

I would probably consider what i saw corrosion i suppose....

IF there is another radial MC out there with the the same physical properties it would be good...

Like i said, bottom outlet and preferably the same lever (not as critical)

I suppose that any of the later GSXR units, say after 2008 would be the new and improved ones

Also, i suppose i should keep the same I.D. ....which i cant remember at the moment...

Is there any spreadhseet like the fork matrix, which lits what will fit what or the sizes ?

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post #4 of 16 (permalink) Old 25th June 2020, 08:21 PM
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Reviving this thread.

What bikes/years have a front brake radial master cylinder that's compatible with the SV1000?

Also if it's compatible with the S version does that mean it'll work with the N version too?

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post #5 of 16 (permalink) Old 25th June 2020, 09:04 PM Thread Starter
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The only difference between the the S and N models is the appearance....
They are the same internally..... The "look" of the exposed reservoir is what was
deemed appropriate on the faired version, but the cleaner look of the intergrated
reservoir on the naked bike was the thing that they thought was better.....
Possible that the boffins thought airflow got disturbed too much with more bits hanging out....

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post #6 of 16 (permalink) Old 25th June 2020, 09:57 PM
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Thanks for that.

Any suggestions on radial master cylinders from other bikes that will work well with the stock calipers?

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post #7 of 16 (permalink) Old 26th June 2020, 07:06 PM
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Never mind. I purchased a used, late model GSXR radial master cylinder. FYI the part # is 59600-47H00.
I'll post photos and impressions after the install.

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post #8 of 16 (permalink) Old 19th July 2020, 10:41 AM
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Any update on the lever?
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post #9 of 16 (permalink) Old 19th July 2020, 09:05 PM Thread Starter
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Any update on the lever?
Do you mean the MC that tzk321 fitted ?

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post #10 of 16 (permalink) Old 19th July 2020, 09:56 PM
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Yeah, the gsxr MC.
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post #11 of 16 (permalink) Old 21st July 2020, 02:29 AM
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I forgot all about this thread.
The gsxr master cylinder was 1/16 inch larger than stock and wouldn't generate enough pressure. So I returned it and installed a master cylinder from a YZF R6. It's the same size as stock but radial. It works fine. I can't say it's changed the feel as much as expected but it works. I have EBC HH pads. I might look into a different brand to get more initial bite. but that's a topic for another thread.

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post #12 of 16 (permalink) Old 30th July 2020, 03:45 PM
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Did the new MC fix the lever squishiness you were trying to address a few months back? I still haven't completely resolved my brake feel problem and I am wondering if replacing the MC would be a solution/upgrade over the rebuilt OEM one I am running.

2004 SV1000S - 29k miles
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post #13 of 16 (permalink) Old 30th July 2020, 08:50 PM
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Quote:
Originally Posted by PenguinsCanFly View Post
Did the new MC fix the lever squishiness you were trying to address a few months back? I still haven't completely resolved my brake feel problem and I am wondering if replacing the MC would be a solution/upgrade over the rebuilt OEM one I am running.
Sadly, no. It still has more play in it than I'd like. But I've learned to live with it. I've had a few different mechanics look at it and all said that it's fine. I've tried a couple of different levers with the new m/c: stock and short Chinese Pazzo. The stock one felt like it had a small bit less play. Currently I have the short Chinese lever on there. I've bent it slightly away from the bar to compensate for the increased travel.

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post #14 of 16 (permalink) Old 30th July 2020, 09:41 PM Thread Starter
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Have you tried pushing the pistons back all the way in the calipers with the cap off, (being careful not to overflow your reservoir, i use the opportunity to soak the fluid out with paper towell), and then refill and
pump the brakes up? Dont do too slow lever pulls either, i have found that a normal movement and then just "drop' the lever (sit cap on as it may squirt back).....and then again and again.....
Once they have pumped up again, use the end of your finger to pull the lever in and let it "flick" back over and over a dozen times...... Then let it sit for a few minutes, then see how the lever feels......

This should purge any and all air, from the system......

If it doesn't, and the lever really is that squishy, then maybe the calipers need servicing....possible the seals are sticky and are pulling the pistons back a tiny bit after you let go.....

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post #15 of 16 (permalink) Old 30th July 2020, 10:05 PM
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Quote:
Originally Posted by tzk321 View Post
Sadly, no. It still has more play in it than I'd like. But I've learned to live with it. I've had a few different mechanics look at it and all said that it's fine. I've tried a couple of different levers with the new m/c: stock and short Chinese Pazzo. The stock one felt like it had a small bit less play. Currently I have the short Chinese lever on there. I've bent it slightly away from the bar to compensate for the increased travel.
Thanks, too bad it never significantly improved. I'm running adjustable position chazzos but haven't experimented with other levers. On an axial MC I can't see cheap levers making a difference. Radial MCs is a different story though.


Quote:
Originally Posted by Missing Link View Post
If it doesn't, and the lever really is that squishy, then maybe the calipers need servicing....possible the seals are sticky and are pulling the pistons back a tiny bit after you let go.....
A few months back when I first started addressing the brakes I rebuilt the calipers, master cylinder and bled the system a few times. I'm running stainless lines, so line swell is ruled out. I could get the lever super solid immediately after the work, however after a few days the lever feel would go back to being pretty bad, and require more travel to get the brakes to engage. I'm either losing brake pressure due to a tiny fluid leak, but there is no visual evidence and the brake fluid level has not changed, or I am getting air into the system somehow.

I'm stumped, and I was hoping a new MC would be the cure.

2004 SV1000S - 29k miles
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