SOHC.co.uk Forums > CB500/550

master cylinder diaphragm

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deltarider:

--- Quote from: McCabe-Thiele (Ted) on October 10, 2022, 06:22:42 PM ---[...] there are a lot of replacement products of inferior quality that I would not buy unless its a known brand & not a fake product.

--- End quote ---
That is exactly my concern. My brake operates fine, there's no sign of wear of the outer protective tube and I have no indication that the inner tube where the fluid passes, can age. Brake fluid is nasty and aggressive stuff. It seems to me the inner tube is of such material that it can withstand that and there's no danger the brake fluid will eat it. If it would, that would be happening much sooner than any period in the maintenance scedule could prevent. What I can understand, is that manufacturers advice to nonetheless replace the tubes after a certain period of time to be a step ahead of possible wear of the outer protective tube. If my outer tube is not damaged, shows no sign of age whatsoever, I conclude nothing is wrong and I prefer to leave things where they are.

McCabe-Thiele (Ted):
In the main I agree with you comments - I see the main weak points as the end sections where the hose is attached to the metal fittings.
The hoses on my 400 are well away from the road unlike on a car.

That said there will be in a finite period where the hoses will deteriorate due to a slow break down of the material structure caused by fluid & uV degregation - add to the mix the changes in pressure to the hose walls and that they are of composite construction they will loose optimum performance over time.
 Brake seals have improved beyond all recognition when I look back at how often car wheel cylinders would last - plus the black suspended streaks you can see in old brake fluid.

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