Best superbike style front master cylinder

[GS1150Pilot]

I have upgraded the 1150 to old school GSXR RSU 41 mm forks and brakes. I bought a Chinese superbike style m/c for the front brakes, which are running braided steel lines. It took forever to bleed the thing and get a lever pressure, and it is still too soft, and I suspect the m/c size is part of the problem. What size m/c would be ideal for this application? Does anyone have a link to the ideal replacement?

[limeex2]

Yamaha are made by brembo, but are not as good as real brembo, still good though. E-bay has brand new Nissin Master cyl's for $125 shipped http://www.ebay.com/itm/NISSIN-STOCK...RYKygN&vxp=mtr I have Nissin brakes in my Speed Triple and love 'em. Tons of used ones on e-Bay, but I would stay away from used m/c's. Most m/c's have 5/8'bores, some EX500's use 1/2" bores. If they were not maintained, the bores get worn and rebuilding is useless. Rebuild your calipers using ONLY OEM parts, paying particular attention to the grooves behind the seals and pistons. Must be meticulously clean and go through them every 2 years. You can also get Mytvac power bleeders for about $28 or make your own for about $2 for lines and some plumbers putty. Don't cheap out on brakes.

[GS1150Pilot]

Already overhauled the calipers, and I have a powerbleeder. It's definitely the m/c.

[GS1150Pilot]

Thanks on the Nissin link, BTW.

[mmattockx]

I have upgraded the 1150 to old school GSXR RSU 41 mm forks and brakes. I bought a Chinese superbike style m/c for the front brakes, which are running braided steel lines. It took forever to bleed the thing and get a lever pressure, and it is still too soft, and I suspect the m/c size is part of the problem. What size m/c would be ideal for this application? Does anyone have a link to the ideal replacement?

1) What is a 'superbike style' M/C? Are you talking about a radial M/C?

2) The ideal size is most likely whatever Suzuki used in the first place on that front end. If you have the OEM M/C look at it and see what bore size is cast into the body. That is the size you want.


Mark

[GregT]

Without knowing what calipers you're running a size recommendation for the m/c is impossible....

[GS1150Pilot]

As I mentioned, the calipers are old school GSXR 1100, which look identical to the GS1150 units.

[GS1150Pilot]

1) What is a 'superbike style' M/C? Are you talking about a radial M/C?

2) The ideal size is most likely whatever Suzuki used in the first place on that front end. If you have the OEM M/C look at it and see what bore size is cast into the body. That is the size you want.


Mark

Yes, radial is probably the term I should have used.

[dorkburger]

I havent tried yet, but I need a remote resorvior type so I can adjust my handlebars to my liking. I asked and bsharpish recommend a Honda RC51 unit. He says that he has used them on various bikes with success.

[limeex2]

The people on the ZRX forum like the 1/2" bore m/c's off of an EX500. Claim its one finger braking. Others have used it, and claim bs. 1150's and all radial's are 5/8" bore size. There is a radial on Ebay right now off of a 2015 ZX636? a 636 ninja, sorry about my model knowledge. fairly new, so the po maintaince should not be an issue. $79 shipped. http://www.ebay.com/itm/2015-Kawasak...3D121684189541

[GS1150Pilot]

Glen, many thanks there. I'm looking at that m/c online now.

[Nessism]

The EX650 master cylinder is a good choice for guys looking for a standard type 5/8" master w/mirror lug. They are a nice quality piece and being late model, you don't need to worry about a bunch of corrosion inside.

[GregT]

As I mentioned, the calipers are old school GSXR 1100, which look identical to the GS1150 units.

If they're 4 -pots, then 12mm or 1/2in bore will as has been said, give very good response.

edit - reading some of the responses, do none of you know how to recondition master cylinders ?

[GS1150Pilot]

Greg, good point. As a British car enthusiast, I'm pretty used to rebuilding hydraulics. I think many people don't feel comfortable doing that.

[GS1150Pilot]

The EX650 master cylinder is a good choice for guys looking for a standard type 5/8" master w/mirror lug. They are a nice quality piece and being late model, you don't need to worry about a bunch of corrosion inside.

Ed, thanks. I will look at those now, too. I don't need the mirror lug, as I run bar-end mirrors.