Upgradable front master cylinder? - GSXR.com
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Old 11-02-2019, 07:42 PM Thread Starter
Squid
 
Join Date: Nov 2019
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Upgradable front master cylinder?

I have a 2012 gsxr 600 my master cylinder is going out. I wanna upgrade it, what will the next step up besides a full blown Brembo one. I see r6 ones get put on alot will that work on a 2012 model?

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Old 11-02-2019, 09:19 PM
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Forget the OEM master cylinder ditch that thing. Get a Brembo master that corresponds to the piston size of your calipers (17RCS or 19RCS), stainless steel braded lines, good pads like Vesrah, Motul fluid and change out the bleed screws with Speed Bleeders (makes bleeding brake fluid so much easier). Out of all the upgrades you can do to a bike improving the front brakes are where it's at. It's a little investment at around $500 total if your keeping stock calipers. But, this is IMO the best money you can spend on an upgrade and at such an improvement it's almost like an upgraded insurance policy for your bike as it improves the braking feel and ability so much.

Brembo Front Master 290
Front SS brake lines 55
Front Pads 110
Motul Fluid 10
Speed bleeders 20


R6/R1 master would be better than oem gsxr but it would work best with R6/R1 monoblock calipers if you can find the set off someone for cheap. Just be aware of the piston size in the calipers as some are smaller or larger diameter if your going to mix a different bikes master with your bikes calipers because this effects the way the piston size in the master cylinder pushes fluid to caliper. This piston ratio creates the lever feel for the brakes (soft or firm). That's why you see 15, 17, 19 version masters.

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Last edited by coreyyok; 11-06-2019 at 04:51 PM.
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Old 11-06-2019, 07:52 AM
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Brembo masters FTW. If you cant find one on ebay or one of the racing sites like WERA then buy new or from hardracing.com

"I wasn't born with enough middle fingers." MM
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Old 11-06-2019, 03:44 PM
Squid
 
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Quote:
Originally Posted by coreyyok View Post
Forget the OEM master cylinder ditch that thing. Brembo master that corresponds to the piston size of your calipers (17RCS or 19RCS), stainless steel braded lines, good pads like Vesrah, Motul fluid and change out the bleed screws with Speed Bleeders (makes bleeding brake fluid so much easier). Out of all the upgrades you can do to a bike improving the front brakes are where it's at. It's a little investment at around $500 total if your keeping stock calipers. But, this is IMO the best money you can spend on an upgrade and at such an improvement it's almost like an upgraded insurance policy for your bike as it improves the braking feel and ability so much.

Front Master 290
Front SS brake lines 55
Front Pads 110
Motul Fluid 10
Speed bleeders 20


R6/R1 master would be better than oem gsxr but it would work best with R6/R1 monoblock calipers if you can find the set off someone for cheap. Just be aware of the piston size in the calipers as some are smaller or larger diameter if your going to mix a different bikes master with your bikes calipers because this effects the way the piston size in the master cylinder pushes fluid to caliper which in the end creates the lever feel for the brakes (soft or firm). That's why you see 15, 17, 19 version masters.
+1
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Old 11-07-2019, 07:16 AM
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Check out galespeed and accosato. Plenty of racers use them without issues.
I have a galespeed and think the quality and feel is better than the RCS. Personally have never tried the accosato.
I have bikes with 3 different sizes RCS, billet Brembo, galespeed, and all the OEM stuff. The billet brembo has the best "feel" and is on my track bike. No microswitch. As soon as you pull the lever you feel the pads start to bite.
The RCS just doesn't quite have the initial, linear grab but works perfectly fine on my street rides and more importantly comes with a microswitch.
The galespeed is also variable ratio and has a microswitch available as option.
The stock Nissin was simply too much of a hit or miss. Even after the recall, it seems some people would get fade, others not so much. My replaced master would fade on the track even after bleeding and burping the system.
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Old 11-07-2019, 07:22 AM
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After the recall my brakes felt the same as originally.
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Old 11-07-2019, 09:35 AM
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I have the Brembo RCS19, EPFA pads, and Core Moto lines. I often find myself just using one finger to brake on the track almost everywhere except the longer straights.

There is a grey blur, and a green blur. I try to stay on the grey one. -Joey Dunlop
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Old 11-07-2019, 11:04 AM Thread Starter
Squid
 
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Quote:
Originally Posted by RockerGuy View Post
After the recall my brakes felt the same as originally.
That's the issue I'm having my bike failed tech on track day they offered to bleed my lines and it got much better it's Been a week and they are back where they were. Once again I had air in my master cylinder bleeder valve.

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