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Not so much air as the slow seepage of fluid retracts the caliper piston and makes for excessive travel... Do you see or hear the air when you bleed it?
As I said, it is a thing. No logical explanation. It just happens, "mysteriously"!!!Cheers, Tim
I found on my 996 that tightening the rear caliper bleed nipple slightly tighter correlated to the issue going away. Whether that was the cause or if was unrelated I don't know, but the rear brake previously needed to be bled after a period of storage, now it does not.
There's a feeling there that Ducati is worse than other brands. From the Yamaha FZ-09 board:
Then you have air in the system, it's that simple...
My Multistrada 620 was $600 US every service interval, which included timing belts. .. Was a great bike.Cheers, Tim
But how did it get in?In our case the system was sealed for 5 years, than last year completely flushed, refilled, and pads replaced.The bike was ridden maybe only a thousand or so miles, including 50 or so on the track.The brakes operated fine all season.Then it was stored by first snow/salt and not taken out of the attached/insulated/partially climate controlled garage until spring where the pedal was immediately found mushy for the first time since the bike had been ridden/stored/removed from storage in the 6 years since we bought it new.There was absolutely no sign of fluid leaking.The only other clue and maybe this has something to do with it. The bladder in the reservoir was a bit extended, but I don't remember if that was only after we started bleeding it before topping it up the first time or if it was already extended last season. Still that shouldn't have been since it was flushed and filled and no m there were no leaks.I dunno, I'm not going to worry about it particularly, I'm just curious.
I had one for 15 years or so.. it was the best sounding motorcycle I've ever had with those Contis. Problem was, I was afraid to ride it any farther than I was willing to walk.
The air is in the moisture that's always in brake fluid despite a sealed system...Or the air passes through hoses without fluid seeping out...There is no other explanation ?
Does the brake fluid give off a gas that accumulates over an extended period and congregates in the top of the caliper? Maybe it's not actually "air" in the system, or the water vapour in the fluid, is gassing off and accumulating ? Got me rooted.
Brake fluid does not give off gas.But however once you reach its boiling point by braking too hard too fast & cause the brake fluid to boil up, condensation will form once it cools down. rarely but does happen O2 forms instead of H2O...At least that is what my tech tells me LOL...