I had this weird problem with my Honda #CRF250L that when I have not used the bike for about a week or more, the rear brake does not work. I found out that if I let a few brake fluid out either from the bleeder screw or the banjo bolt, at an instant it will work again. It has been like this for a while and is a hassle whenever I want to use the bike. I am working away from home so I seldom use the bike. I suspect the seal inside the master cylinder piston is getting bad. So I decided to rebuild the #rearbrake master cylinder and fix this issue once and for all.

The rebuild kit I used is not specific to Honda CRF250L but a generic part that will work with many different bikes. It is because many Honda motorcycles use the same Nissin 1/2" brake master cylinder and the internal parts are the same.

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