Welcome to the forum 
Rear brake can be upgraded. But for light use is fine. Some people (like me) hardly use rear brake.
Make sure you clean the caliper and change the pad, before start investing in mods. I personally prefer light action hence I use soft EBC organics pads.
Note hard ceramics/sinthered "race" pads and powerful calipers like FZS 1000 can eat your disc pretty fast. And changing the rear brake disc is a real PITA.
Some people has resorted to new rear wheels because of forever stuck disc bolts.
Frankly with all the mods you already have your bike just needs oil and riding
Rear brake can be upgraded. But for light use is fine. Some people (like me) hardly use rear brake.
Make sure you clean the caliper and change the pad, before start investing in mods. I personally prefer light action hence I use soft EBC organics pads.
Note hard ceramics/sinthered "race" pads and powerful calipers like FZS 1000 can eat your disc pretty fast. And changing the rear brake disc is a real PITA.
Some people has resorted to new rear wheels because of forever stuck disc bolts.
Frankly with all the mods you already have your bike just needs oil and riding
Adrian Monk: Unless I'm wrong, which, you know, I'm not.
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