Hi guys I'm putting together a Feibao L39, My brakes are leaking pretty bad, I t've take off my Orings and they look OK, bu I don't know if their size is right, if anyone can help I'll apreciate.

Thanks.

I had a similar problem with my kingcat brakes, O-rings were leaking badly, I injected silicone oil on each brake nipple (about .25 CC) using a syringe while keeping pressure on them for afew seconds, leaks ceased...

Thanks Ruiz, I bought an O-ring a litle bit larger, did what you told and the leaks stoped! Now I can move on another step of the build!