Hi, I am new to this forum as well as to the world of electric bikes
. I'm visiting my family's home in Canada. My cousin has bought a HappyRun G70, just 2 months. He asked me to take care of technical support and maintenance. Unfortunately that manufacturer doesn't have technical support for that model, here. Although I am retired, I am a mechanical engineer and I believe that I can help you, but it would be very useful for me to have the support that you can give me in this forum. A couple of weeks ago the rear brakes did not work due to lack of oil. for DYISLAND brand brake system oil.