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front brake master cylinder rubber gasket thing?

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gigglewizzard
L Plate Warrior



Joined: 01 Oct 2020
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PostPosted: 13:18 - 01 Oct 2020    Post subject: front brake master cylinder rubber gasket thing? Reply with quote
so i was fixing up my 2013 ybr 125s brakes, i had to top up the brake fluid.
i took the rubber gasket thing out and it has swollen so much that it wont fit back in.
is it a universal thing i can buy? because i cant find one for sale for my ybr, just the whole master cylinder.
i tried instant gasket, but the fluid just melted it.
also is it normal for that thing to swell up?
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sickpup
Old Timer



Joined: 21 Apr 2004
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PostPosted: 13:21 - 01 Oct 2020    Post subject: Reply with quote
Just checking, you realise its a bellows arrangement and needs folding before refitting?
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gigglewizzard
L Plate Warrior



Joined: 01 Oct 2020
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PostPosted: 13:44 - 01 Oct 2020    Post subject: Reply with quote
sickpup wrote:
Just checking, you realise its a bellows arrangement and needs folding before refitting?


yeh. there was no way i could get it into the space it had, even if i tried to scrunch it up
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WD Forte
World Chat Champion



Joined: 17 Jun 2010
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PostPosted: 19:26 - 01 Oct 2020    Post subject: Reply with quote
I've seen lots of split and perished MC lid diaphragms but don't recall seeing
any that had swollen up enough to make refitting impossibru

got a pic?

anyroadup here's a link to Foulups and they'll flog you one for a few quid
(on backorder)
https://www.fowlersparts.co.uk/parts/view/4KL-F5854-00

OR
Ebay
-sAAOSw6JJe-1Tm" rel="nofollow" target="external_link_2">https://www.ebay.co.uk/itm/YAMAHA-Diaphragm-Reservoir-4KL-F5854-00-OEM-YBR125-XC125/362541230769?epid=2264989682&hash=item5469242ab1:gVery Happy-sAAOSw6JJe-1Tm
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xX-Alex-Xx
World Chat Champion



Joined: 12 Sep 2019
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PostPosted: 19:59 - 01 Oct 2020    Post subject: Reply with quote
You're not putting it in upside down are you?
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davebike
World Chat Champion



Joined: 15 Nov 2013
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PostPosted: 07:38 - 02 Oct 2020    Post subject: Reply with quote
Not looked very hard Ebay is not agreat parts place !

https://www.fowlersparts.co.uk/parts/5452299/ybr125ed-2012-51d2-europe-dark-bluish-gray-metallic-8/front-master-cylinder

No 4 needs to be ordered not a stock part I would guess a few days
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NC750Xdct + others at work !
davebike1@gmail.com
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MCN
Super Spammer



Joined: 22 Jul 2015
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PostPosted: 19:07 - 02 Oct 2020    Post subject: Reply with quote
Did you use any 'stuff' to clean the rubber with anything?

The materials used in many brake systems are sensitive to certain compounds.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.
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