Help - Issues with Clutch going soft

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a friend just changed the slave cylinder on his 2013 1199r (oberon) - 300+ miles on it and it is spot on perfect - he was typically bleeding it after each ride as well before the slave cylinder swap

My 2019 V4 Panigale’s clutch worked well up to 7000 kilometers, then started to get air into the circuit. I changed the fluids to Motul 660 but didn’t help at all. Drove another 10 000 km, doing bleeds every few hundred km. Then swapped the slave cylinder to Oberon and the problem went completely away. I haven’t had to bleed even once after that.

I discussed this with a Ducati mechanic, and he said the engine heat kills the slave. Especially track days on hot weather. Showed few replacment slave cylinders on the table waiting to get replaced to bikes that had clutch issues.

Oberon has done now 4 track days and few thousand kilometers on street and so far so good. Might be more lasting construction than original. But original also worked the first 7000 km.
 
i can recall the days (mid to late 90's, in to the 2000's) when aftermarket slaves did not help - from what i remember nothing stuck out as the "thing to do" being the final solution, so i just never bothered with anything, other than the bleed process, using all my technical mechanical skills in the process ;)
 
There is no universal solution because there is more than 1 place in the hydraulic circuit that can potentially leak. But to me the slave cylinder feels most likely first failure point due to its exposure to the engine heat.
 
Any input would be great. I was out on the track yesterday and about mid day (4th session) 5 laps in my clutch went super soft going down the straight. This is the second time this has happened, but not second consecutive time. Spent all day Friday on the track no issues, it was raining so not pushing as hard. Both times this has happened it's after multiple sessions and when it's been relatively hot out and I was pushing the bike hard. Bike is a 2019 V4 S
I had the same issue with my 18 Panigale V4S. Like many have said just bring an 11mm wrench and bleed it from the clutch . It only takes a few seconds . I would just have brake fluid with you and keep it topped off full so when you bleed it you can ride all day with no issues . I know there was supposed to be a recall /update for mine . It was done and got better but still I had to keep bleeding it just not as frequently. Good luck !
 
Update I have risen the bike for about 1000 miles and the clutch is still good fren tubo line with an Oberón slave using motul 660
 

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