Singletracks Mountain Bike News, Reviews, MTB Trails and Community › Protected: Forums › Mountain Bike Forum › bleeding Tektro m285 brakes (why is there a pin hole?) › Reply To: bleeding Tektro m285 brakes (why is there a pin hole?)
August 18, 2020 at 22:26
#502957
Faulty bladder/gasket and or cover warped… Also check the hose connection for leaks. Key to hydraulic lines is not to ever tighten. Solving a connection leak can sometimes be done by simply loosening and tightening the connection hardware a couple times to shape the metal parts and seat them so they no longer leak.
Worse case, replace master cylinder.