R1200RS + R1250RS Forum
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Tue Oct 17, 2023 10:54 am
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Strapping the lever open overnight, after proper bleeding, lets any small amount of air find it's way up to the master cylinder. I have success with this method on the brakes on my Ducati & RS. Especially helpful on the Ducati clutch, which always seems to take a bit more effort than the brakes |
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Zitat von duccrazydave im Beitrag #18 Open?
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Zitat von wessie im Beitrag #2 My 21 RS came with Hayes calipers - it is a 1250 tho  20220501_103445 (1).jpg - Bild entfernt (keine Rechte) 2021 R1250RS SE, Hybrid RD350YPVS F2 |
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The strap on the lever thing has worked for me too on many bikes but only for a short while (an hour or so) and then the lever movement returns to normal. The theory I've heard is that it causes micro bubbles to coalesce and then the 'big' bubble finds its way into the reservoir. |
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Zitat von Dieseldog im Beitrag #20Zitat von wessie im Beitrag #2 Ahh, the Nook. I was up there for lunch on Friday  |
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Zitat von Sanemancured im Beitrag #21 Just so I understand, the air coalesces on which side of the lever-activated piston, the high (caliper) or low (reservoir) side while the lever is strapped? And, the strap is applying pressure to the lever or holding it open?
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Zitat von Mr. 36654 im Beitrag #23Zitat von Sanemancured im Beitrag #21 The strap applies pressure to the lever and thenceforth to the system itself. The theory I've heard expressed is that, the micro bubbles of air in the compressed system gather together (for some reason) and form a larger bubble that rises to the top of the system. When the lever is released this big bubble vents into the reservoir. I actually doubt this from my own experience. I think it more likely that brake fluid that leaks over time past the seals when the system is left compressed, causes a temporary positive effect on lever travel as it migrates back into the system, giving a false temporary impression of less air in the system. Air bubbles in a compressed liquid will reduce in size and move further apart. I can't see this leading to them coalescing. |
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Zitat von Sanemancured im Beitrag #24 Yes, increasing pressure will drive the air back into solution with the fluid. I have too many decades of cavitation testing in my background to believe otherwise
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Are propellers involved, or pumps? |
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I should start saying these responses out loud, to myself, before hitting send, lol. Strap holds the lever in the fully engaged (to the bar) position to allow the path to the highest point in the system, the master cylinder, to remain open. |
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Zitat von duccrazydave im Beitrag #28 So, everything from the master cylinder (i.e., the actuating piston) to the brake calipers is under pressure from the strap?
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