It's worth checking inside the master cylinder where the piston goes to see if there is any metal that has rubbed away. Sometimes the master cylinder body gets scratched inside and that can lead to problems also.
@@Chambers36TheEnter thanks for the hint. BTW, do you know of any changes to the master cylinder shortly after tech 4s were released? I did read in Mtb forums that there were some issues with tech 4s from the first batches. Changing the master cylinder solved the problem. But not sure if there was a change to the cylinder or if it was a production issue.
Hello and thank you for the video. I replaced the seals according to the instructions, which was pretty quick. My problem, however, is getting the rod with the seals back into the housing, as the seals spread apart when inserted. Do you also have a video of this part of the maintenance so I can see how you do it? That would be really good. Best regards.
Hi That's just a case of doing small circles rather than pushing the it straight down. Something like this - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fSwi0duinXQ.html
love your tutorials, btw should i grease the seals before putting piston back in, or can hopes silicon lube be used just to make it little lubed since i dont think it needs much grease inside?
Thanks. You can use hopes silicone lube on the piston seals before putting them back in or even some DOT fluid. Best way I found is to not push them in straight but to push them in very softly whilst wiggling the pistons around in small circles. Like this - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fSwi0duinXQ.html
