Hi, I'm encountering the same issue on my m785 fron lever is more affected then the rear one. Can someone please tell me the material of the piston inside the master cylinder? is it from plastic/composite or metal? I'm asking this because on aliexpress i can see that the same seller is selling aprons(rubber o-rings) separately and he is also selling a metal piston together with the o-rings. https://bit.ly/2IYe5eo https://www.aliexpress.com/item/32973287602.html?spm=a2g0s.9042311.0.0.3c344c4d9QAbRL And don't know which version is better to buy. Apparently , if the original piston is from plastic, it seems a better idea to buy the whole metal piston, but don't know how will this impact the entire system. Let me know you're thoughts.
