Much has been made of the new "self-bleeding" brakes on some of the crop of new bikes coming out of Bologna. I wonder if these are simply stock Brembo master cylinders and calipers with Ducati's own take on Stahlbus one way bleed nipple valves, or have they re-invented the wheel?
Umm i wonder - bought a Stahlbus together with an Oberon slave last month. Its about to come off as I am in the process of reducing everything back to stcok to find why i can't get more than 0.733 of travel (should be 2.25)
At this stage not well. I fitted an MPL (Germany) many times without issue. I can't get the Oberon to work. It could be coincidence with something else not working. I found my pressure plate near warn through so that did not help (attached) Oberon technical help have been very good calling me on 3 occasions. But I have to return everything back to stock and eliminate each link in the chain one by one. Time is limited so this may not be for 3 months yet
Time for a slipper? My newly installed one has made my typical Ducati Monster clutch (reliable but heavy) into a Yamaha 125 which is effortless even in town riding. Plus the rattle is even better than before!
Thanks Sev, All checked. System bled around 12 times - no air seen. Now i am looking to the master as a possible source for the issue. I adjust the lever screw unitl there is no more movement but still no luck.
Thanks again Sev, spacer fitted at one stage in a "try anything and everything" mode. But the slave would not go on then. EOM and MPL did not need spacer and measurement confirms this.
Thanks Sev, I shall add that to the list! I am annoyed at myself because this is normally a 30 min job, but I forgot most 30 min jobs can be 30 Hours if something goes wrong. Unfortunately with limited time this adds up to the bike being off the road most of the summer. THIS is why I have two bikes!
I would like to pick up the original topic of self bleeding brakes and clutches. I have a 2021 Panigale V4S which in theory has all the self-bleeding hardware. The bike barely has 6K KMs, I did not have to bleed the clutch yet. However the rear brake fluid is toast and the front is also in need of bleeding. And I have always been wondering how the self bleeding/purging mechanism works. And I could not find anything solid about it despite extensive searching. I checked the part numbers of front brakes and clutches to see if there is any new bleeder valve compared to previous models, but if Ducati-parts is a reliable source, then there is none. There is a new clutch slave introduced with 2021 models and MCs also changed but bleeder valves did not. Can someone with more knowledge share his insights? My bleeder valves certainly do not resemble a Stahlbus one so I am really wondering about how self bleeding works. 2021 Superleggera V4 and 2021 V4 SP Clutch MC - 63040851BA Clutch MC bleeder valve - 63140281A Slave - 19540091D Brake MC - 62441231AA Brake MC bleeder valve - 63140281A Front caliper bleeder valve - 61240201A 2021 V4S Clutch MC - 63040932AA (63040931AA previously) Clutch MC bleeder valve - 63140281A Slave cylinder - 19540091D Brake MC - 62441341AA Brake MC bleeder valve - 63140281A Front caliper bleeder valve - 61240201A 2021 Streetfighter V4 Clutch MC - 63040952A (63040951A previously) Clutch MC bleeder valve - 63140281A Slave cylinder - 19540091D Brake MC - 62441362A Brake MC bleeder valve - 63140281A Front caliper bleeder valve - 61240201A 2020 Panigale V4 Clutch MC - 63040602C Clutch MC bleeder valve - 63140281A Clutch slave cylinder - 19540091D (previously C) Brake MC - 62440762C Brake MC bleeder valve - 63140281A Front caliper bleeder valve - 61240201A
Hmm....the stock bleed nipples offer nothing different to regular bleeding methods, so not sure how they claim the new crop of bikes are 'self-bleeding'. Perhaps a dealer might explain where in this collection of parts, that process is enabled. Maybe "Nelly" knows more on this.
I think it refers to the self bleeding capability of the master cylinder. Had it on both the Diavel and the Scrambler which I have to say, did nothing for the overall performance of the system. Really, really, REALLY pleased I changed the master cylinder on the Scrambler Andy
I found this: "Moreover, all Streetfighter V4 models in the 2021 range are fitted with new front brake and clutch pumps, both self-bleeding and derived from those used for the first time on the Superleggera V4. The body of the new pumps has been designed with a configuration that allows a ‘natural’ bleeding, thus eliminating the need to intervene on the system in the event of air present in the circuit." Source: https://www.totalmotorcycle.com/motorcycles/2021/2021-ducati-streetfighter-v4s So the magic is not in the valves but in the MC bodies.
fascinating subject, lateral and radical thoughts needed here, not by me though, as past contributions nearly got me banished to "the earth is flat" forum".
Having spoken to the MD at Oberon he advised that their slave cylinder travel doesn't quite give the same amount of travel that the OE one does. Having fitted it, everything worked OK except finding neutral from first at a standstill was not easy as more often than not you ended up in second which indicated that there was a bit of clutch drag so I have reverted back to the OE one. It could be that I need to look at the clutch rather than the slave cylinder. He did give me some guidance and asked me to take a couple of dimensions to indicate piston travel but I haven't got round to refitting it yet. I think his main thought was whether the hydraulic system had been properly bled. With this in mind I found the most effective method of bleeding the system was to pull the clutch lever as far as possible and then open the bleed valve rather than open it before pulling the lever. Fluid and air are then ejected with some force. Same method used for the braking systems. I found Steve most eager to assist with finding a solution, so top marks for customer service.
