2013 961 clutch master cylinder

Charlotte

Charlotte

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Hi everyone. I’ve tried bleeding the clutch master several times and even trying reverse bleeding, my clutch feel is sometimes spongy. Also, somewhat grabby and also, the bike wont go into gear very well(grinding). I’m thinking of trying a different clutch master. I’ve found a brembo unit that looks identical . It fits Ducati 90, 916, s4 monster.
Question…. I’ve seen it listed as a 12mm and also a 13mm. Does anyone know if its 12 or 13mm?
Or better yet , a Brembo part number that for sure is the replacement?
Thanks!!!
 
Check the drive sprocket nut first. If loose it can cause similar issues.
 
Charlotte said:
Hi everyone. I’ve tried bleeding the clutch master several times and even trying reverse bleeding, my clutch feel is sometimes spongy. Also, somewhat grabby and also, the bike wont go into gear very well(grinding). I’m thinking of trying a different clutch master. I’ve found a brembo unit that looks identical . It fits Ducati 90, 916, s4 monster.
Question…. I’ve seen it listed as a 12mm and also a 13mm. Does anyone know if its 12 or 13mm?
Or better yet , a Brembo part number that for sure is the replacement?
Thanks!!!
Click to expand...
Brembo is one of the few that, if you are having difficulty bleeding, a good vacuum bleeder comes in really handy. We don't bleed Brembo masters without it. Also, for those rare instances of trapped air, the old method of zip-tying the lever in does help. Check the bleed holes to ensure you see fluid coming back into the system.

also back off any clutch lever adjustment, you may have made to ensure you are getting full clutch piston stroke when bleeding. I've seen this happen a lot as well.

You shouldn't need a different master than what is in stock. The Oberon slave can take different master sizes depending on what you are looking for but with trade-offs for up and downsizing to a more modern Brembo master like the Radial line. Going to a larger size will make the pull harder

And as BritTwit says, check your nuts! I would pull the slave and cover just to give everything a visual anyways.
 
City Garage said:
Brembo is one of the few that, if you are having difficulty bleeding, a good vacuum bleeder comes in really handy. We don't bleed Brembo masters without it. Also, for those rare instances of trapped air, the old method of zip-tying the lever in does help. Check the bleed holes to ensure you see fluid coming back into the system.

also back off any clutch lever adjustment, you may have made to ensure you are getting full clutch piston stroke when bleeding. I've seen this happen a lot as well.

You shouldn't need a different master than what is in stock. The Oberon slave can take different master sizes depending on what you are looking for but with trade-offs for up and downsizing to a more modern Brembo master like the Radial line. Going to a larger size will make the pull harder

And as BritTwit says, check your nuts! I would pull the slave and cover just to give everything a visual anyways.
Click to expand...
Regarding the clutch lever tied back. How much time should i do this for( 12hrs, 24hrs, etc?). I’ll also try a vacuum bleeder. I think the vacuum pump i have is able to do this.
 
City Garage, you mention the slave cylinder. Is it possible that it is loosing pressure as it’s being engaged? For some reason I was imagining the master failing not the slave.
Regarding the slave cylinder, I’ve seen the Oberon pieces for sale but does anyone know of any replacement Brembo slave units? I didnt see any when searching online for them.
Thanks everyone
S
 
Charlotte said:
City Garage, you mention the slave cylinder. Is it possible that it is loosing pressure as it’s being engaged? For some reason I was imagining the master failing not the slave.
Regarding the slave cylinder, I’ve seen the Oberon pieces for sale but does anyone know of any replacement Brembo slave units? I didnt see any when searching online for them.
Thanks everyone
S
Click to expand...
Losing pressure would mean losing fluid or that the bleed hole has an issue. The bike was spec with a Oberon slave and a Brembo master so that's what you need to stick with.
 
Thanks City Garage. Overnight it is. Interesting though…my slave cylinder has Brembo embossed on it?
S
 
City Garage said:
Losing pressure would mean losing fluid or that the bleed hole has an issue. The bike was spec with a Oberon slave and a Brembo master so that's what you need to stick with.
Click to expand...
My 2013 came with a Brembo slave. I swapped it for an Oberon although I didn't really need to. Turned out to be a different issue. Clutch basket nut backed out a bit.
 
Britfan60 said:
My 2013 came with a Brembo slave. I swapped it for an Oberon although I didn't really need to. Turned out to be a different issue. Clutch basket nut backed out a bit.
Click to expand...
Hi Britfan , Its good you mentioned this because the other fellow should check this also .
 
UPDATE:
I started with the drive sprocket nut torque and seemed good. I then again reverse bled the system. Then bled the system again conventionally. Then discovered the clutch lever was one notch in from fully out. Adjusted that out to the full extend detent and I think that may have done it. I haven’t had a chance for a decent test ride but around the block, it seems better.
I will be checking the clutch basket nut in the near future because I’m changing out the starter. I’ll report back if I find anything out of sorts.
Thanks everyone for the suggestions. Much appreciated!
S
 
Good to hear you may have made some progress.

I found that using a velcro strap on the levers was kinder on the rubber grips than a zip tie.
 
Charlotte said:
City Garage, you mention the slave cylinder. Is it possible that it is loosing pressure as it’s being engaged? For some reason I was imagining the master failing not the slave.
Regarding the slave cylinder, I’ve seen the Oberon pieces for sale but does anyone know of any replacement Brembo slave units? I didnt see any when searching online for them.
Thanks everyone
S
Click to expand...
Try Birmingham Norton and ask for a price .
 
At the risk of pointing out something obvious, that you have probably already checked, have you looked to see if the three screws holding the slave cylinder are loose? I had a similar problem with my 961 a coule of years back, and the problem was loose screws allowing the slave cylinder to move in and out. Eventually it got so far out that it didn't have enough effective travel to fully release the clutch. It was a progressive problem, in that as I put more miles on the bike, the screws gradually became looser. To be fair to the factory, they were loose because I had removed them and apparently had not tightened them sufficiently when I replaced them.

Ken
 
lcrken said:
At the risk of pointing out something obvious, that you have probably already checked, have you looked to see if the three screws holding the slave cylinder are loose? I had a similar problem with my 961 a coule of years back, and the problem was loose screws allowing the slave cylinder to move in and out. Eventually it got so far out that it didn't have enough effective travel to fully release the clutch. It was a progressive problem, in that as I put more miles on the bike, the screws gradually became looser. To be fair to the factory, they were loose because I had removed them and apparently had not tightened them sufficiently when I replaced them.

Ken
Click to expand...
That's a good point , but he went to the effort to check tightness of the sprocket nut and I usually remove the clutch slave on the way in. But good point .
 
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