R100 Handle bar master cylinder size

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snowy
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R100 Handle bar master cylinder size

Postby snowy » Sun Aug 20, 2017 7:54 am

Good morning all
Some more words of wisdom from fellow members please
I want to put the handle bar master cylinder onto this 'bitsa' that I have purchased ( the under tank one isn't there anyway), now I have fitted 13mm ones in the past, but, I have in my collection some 14mm and 15mm ones, would they do as a replacement for the 13mm that is usually supplied with the conversion kits.
Seems a shame not to use them and besides it would save me a large amount of pennies.
Your thoughts please
cheers
snowy

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Re: R100 Handle bar master cylinder size

Postby IanG » Sun Aug 20, 2017 8:07 am

I presume you have twin discs.? If so then 14mm will probably be the best option. 13mm is usually used on single discs. My R100 had a 15mm fitted from new and the brakes weren't great. I swapped it to a 14 and it is better. I wondered about a 13 but was told that it might have excessive lever travel to move enough fluid to two calipers.

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snowy
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Re: R100 Handle bar master cylinder size

Postby snowy » Sun Aug 20, 2017 8:30 am

Thanks Ian.
I will dig the 14mm out and get it serviced and fitted, yes it does have twin discs, I have some nicely serviced r1100/k100 types but of course the control switches wont fit.
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Re: R100 Handle bar master cylinder size

Postby SteveD » Sun Aug 20, 2017 10:20 am

I used a 13mm from a mono R80 on my 82 RS. It's excellent, with good progressive feedback.
It replaced the terribly wooden feeling 15mm mc.
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snowy
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Re: R100 Handle bar master cylinder size

Postby snowy » Sun Aug 20, 2017 1:02 pm

Hi Steve
I had a 14mm to hand, fully serviced it and fitted it to the bike, I had a 13mm but it required a piston service kit, my home is already mortgaged to the hilt paying for bike spares so I used the 14mm.
Agree with you that the 13mm is a good master cylinder, all the others that I have built ( rebuilt) have had 13mm fitted.
thanks for your input
cheers
snowy

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Re: R100 Handle bar master cylinder size

Postby SteveD » Mon Aug 21, 2017 6:55 am

No worries :thumbup: The 14mm is often recommended too. I'm sure it's better and less wooden than the 15mm and probably not so much lever travel as the 13mm to acclimatize to.
Cheers, Steve.
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Re: R100 Handle bar master cylinder size

Postby snowy » Wed Aug 23, 2017 10:45 am

Moderators
Please delete this thread as question has been answered and acted upon, thanks, snowy

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Re: R100 Handle bar master cylinder size

Postby windmill john » Wed Aug 23, 2017 11:07 am

If the moderators did that Snowy, we'd never have any history and info to refer to!

Or maybe that's why I removed my M/C and fitted a drum brake, because I couldn't find the info :wink: :grin:
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snowy
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Re: R100 Handle bar master cylinder size

Postby snowy » Wed Aug 23, 2017 9:13 pm

Hi John
Thanks for that bit of sound common sense, I like many no doubt refer to old threads for info, just put it down to trying to be tidy and old age ha ha.
cheers
snowy

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Re: R100 Handle bar master cylinder size

Postby boxerman » Wed Aug 23, 2017 9:22 pm

You're not the first to request that we 'tidy up' and remove old posts. As has already been pointed out most of that stuff is a valuable resource.
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