Date: 21-10-17  Time: 20:17 PM

Author Topic: Rear master cylinder seals  (Read 248 times)

Shappaeye

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Rear master cylinder seals
« on: 02 September 2017, 02:59:06 PM »
Hello!


I recently had to replace pistons and seals on my rear caliper as the rear brake completely failed.


While I was taking it all to pieces, I thought replace the brake line and seals in the master cylinder.


Brake line not a problem, seals in the master cylinder on the other hand are like rocking horse s..t!


I went into my local biker shop, they aren't listed unless you got to Yamaha which are 50 a set.


Anyone had a similar experience? Do they ever fail? Is that why they aren't around or common as others?


I am wondering if after stripping the plunger, etc out of the cylinder perhaps I should just rebuild it and hope a clean out was all it needed.

bandit

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Re: Rear master cylinder seals
« Reply #1 on: 02 September 2017, 03:29:59 PM »
I would just rebuild the old one if the seals look o.k & give it a try as brake fluid ain't expensive,but if you need new & in stock,Smile


 https://www.fowlersparts.co.uk/parts/4165876/fzs600-fazer-5dm7-2000-070-a/rear-master-cylinder    or


wemoto.com £44.29 genuine Yam part.
« Last Edit: 02 September 2017, 03:51:24 PM by bandit »

Fazerider

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Re: Rear master cylinder seals
« Reply #2 on: 02 September 2017, 03:58:43 PM »
I believe the rear master cylinder is the same as on the Diversion, possibly other models too.
Yamaha do recommend changing the rubber parts of the baking system every 4 years... obviously that's a bit extreme, but 4 times that?
I'd change them.


>update< It looks like some of Yamaha's 250cc offerings used the same component.
DYOR, but I think this will suit... (though it may have spent 20 years on a shelf).
« Last Edit: 02 September 2017, 04:10:34 PM by Fazerider »

Shappaeye

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Re: Rear master cylinder seals
« Reply #3 on: 02 September 2017, 06:02:46 PM »
Thanks guys,


I rebuilt it and it still failed to bleed properly.


The flow was very poor from both bleed nipples and it wouldn't engage the pistons properly.


Thanks for the Fowlers link, thats where my local bike shop said I should try.


50 quid it is then.

Shappaeye

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Re: Rear master cylinder seals
« Reply #4 on: 02 September 2017, 06:31:37 PM »
Can't believe I'm moaning about sorting my brakes out! Part ordered.


 :eek


Jules-C

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Re: Rear master cylinder seals
« Reply #6 on: 05 September 2017, 08:37:26 PM »
The rear brake is always hard to bleed after air has got into master cylinder because the high point in the system is the banjo bolt on the master cylinder.

Try undoing the banjo bolt and using it like a bleed nipple to bleed the air out.

And take caliper off bracket and hose clamp off swinging arm and tie caliper to pillion footrest so it is higher than the master cylinder and try to bleed it there to help the bubbles move along the hose. Remember to something between the brake pads so you don't pump the pistons out

Disorderlypunk

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Re: Rear master cylinder seals
« Reply #7 on: 05 September 2017, 08:52:18 PM »
dont want to burst the bubble here but thats for the FZR
- unless it happens to have the same part number which i didnt find when having a quick look around


this is the FZR - it aint no FZS

edit - just realised it wasnt the OP that posted the ebay link so if its the wrong part no harm no foul
« Last Edit: 05 September 2017, 09:10:21 PM by Disorderlypunk »
riding this that and the other
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Disorderlypunk

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Re: Rear master cylinder seals
« Reply #9 on: 13 September 2017, 02:35:45 PM »
using a pit bike master cylinder
when your tagline says
'follow me and ill show you were to crash'


-something tells me to find the cylinder rebuild kit lol
riding this that and the other
modifing everything...
vloggin some bits - http://www.youtube.com/channel/UCvWtJO9iyS8XsR9RNHx72UQ