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Like @jambon said, if you’re replacing it then you need to rebleed.
Take it as an opportunity to put new fluid in the brake and bleed it fully.
Buy one of these kits for whatever the cheapest price you can find. You can do it without, but this is worth every penny for the time saved.
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Don’t need that kit for the rear. Bleeding rear brake is piss easy. It’ll take five minutes tops. Fill reservoir, push brake lever down a few times till piston comes out. Push down once again but hold, open bleed port, close bleed port, release lever. Do a few more times in that sequence till you feel good resistance and you have pressure.
It’s easier than bicycle.
So, earlier than I was hoping, but need a little advise on maintenance!
I’m hoping this is as small a job as I think it is. I’ve noticed the rear brake is not actuating the light (but front brake is)
I’ve isolated the issue (worn cable) and found a replacement.
Now all I need to know is, will I need to bleed the brake (I hope not), or is it just unscrew and screw back in?
I can get some better photos without that plate on tomorrow.