SOHC.co.uk Forums > CB500/550

master cylinder diaphragm

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Bryanj:
Dave Silver has them or just order from your local dealer and not pay postage

Bryanj:
I think you will find it is a reinforced synthetic rubber

deltarider:
I'll get one. I just wondered if I could ride the bike to go and get one.
@Rob. Replenished the brake fluid yesterday. The old just a tad darker, but not much. Renewed the bleeder that needed locking pliers to be freed. With an expert I closely examined and tested my brakelines. We couldn't detect any sign of wear. Although you can feel it in the lines when you apply the brake, it is minimal and I don't expect it to be less with a new OEM line. In general people refer to these lines as rubber. I wonder what material the inner tubes are really made of. I don't think it's rubber.

deltarider:

--- Quote from: Bryanj on October 10, 2022, 04:08:51 PM ---I think you will find it is a reinforced synthetic rubber

--- End quote ---
Aha, I'll try to find the specific name used in the industry.

McCabe-Thiele (Ted):
Just as a matter of general interest flexible brake lines had a in-use life of 5 years back in the 1960's- most UK manufactureres recommended replacement after 5 years on cars as routine maintainance.

The life and quality of materials has improved substantially since then but the life span does not seem to be mentioned for modern materials. I suspect climate & mileage make this difficult to quantify. I had a front brake hose fail on my Carlton - turned out to have missed a factory recall as the top & bottom steel sections had been assembled upside by the suppliers down causing abrasion and failure. Luckily despite the hose inflating like a baloon the dual circuit avoided an accident

I tend to run older vehicles these days but I do replace the flexible wheel hoses & rear axle hoses where fitted as a matter of routine once they are 15 years old or sooner if the end fittings have rusted or if they have stone type damage.

Personally I see 10 years on a motor cycle as a maximum even if visually sound - there are a lot of replacement products of inferior quality that I would not buy unless its a known brand & not a fake product.

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