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Stands to reason with more pistons, more fluid needs to move. Is there a GSXR master cylinder I can use or am I relegated to Nissin/Brembo?

Thanks!
 

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I believe the master will depend on the calipers. Piston size blah blah blah but Yes you can go with a gsxr master. I have a 01 gsxr front end and run a brembo GP mk2 16-18 master with 4 pot Tokicos. Good setup! I am upgrading my front end right now so I can run R6 radial calipers and I can retain my master. Great setup!

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Lots of people run the R6/R1 Brembo master. They're also available used off newer ZX10r's. I'll report back when I install mine... new brake lines should arrive today then I can install.
 

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I am running the stock master cylinder on my 2012 DL 650. Using SV 1000 calipers. Works fine. Would a different MC work better? Maybe, but the improvement is dramatic as is! The trick, and it baffles some, is getting ALL the air out after doing the swap. If the lever is soft, there IS air.
 
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I’m running a Nissin radial MC (GSXR) with stainless lines & GSXR/SV1000 Tokio 4 pot calipers. Overall better brake feel, pressure and stopping power, plus I get to keep my stock mirror location and brake switch connection...
 

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The 1000 uses the same master cylinder as the 650. I'm running SV1000 4piston calipers and the stock master. Great improvement over the 2piston calipers.
 

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The stock g2 sv650 master is too big for the stock calipers. That's why they're wooden.

Switching to the 4 pistons makes the ratio better. So you're fine with the stock 5/8 inch master cylinder.
 
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