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22-06-2020, 05:33 PM | #1 |
Bronze Member
Join Date: Jul 2006
Location: Poole
Bike: M900ie
Posts: 472
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Front Brake Master Cylinder problems
Hi all, OK I'm using an early coffin type Master Cylinder, my original cylinder marked as 93 had begun to leak and was generally well weathered, so I've bought a second hand one marked 98 and looking in better condition although there was a bit of a residue inside the reservoir. Having tried out the replacement I found it has no pumping effect, I tried pumping fluid back through the system to bleed out the air, but still nothing. Has anyone any suggestions? or experience of replacing the seals (assuming kits are available) I'm guessing there must be a circlip maybe under the rubber gaiter? All assistance gratefully accepted, as I'm a bit frustrated with it at the moment, Bitza.
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Bitza |
22-06-2020, 06:30 PM | #2 |
Too much time on my hands member
Join Date: Jan 2013
Location: Shipbourne
Bike: M900
Posts: 1,421
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If anyone knows where to get the seals I also need some for my 750SS. I heard Powerbronze do them but have not chased it up yet as that is this winter's project
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22-06-2020, 06:40 PM | #3 |
Registered User
Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
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22-06-2020, 06:47 PM | #4 |
Registered User
Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
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Mr Gazza sourced a replacement seal kit in that earlier thread so I'm sure he'll be able to point you in the right direction.
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22-06-2020, 08:01 PM | #5 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,853
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It's all very easy. All the answers are in that thread that Luddite linked to, so you don't have to find out the hard way like I did.
Seal kits come from Moto Rapido or Powerhouse. Rip out the rubber boot to reveal the retaining ring, then warm the master a bit and prise the ring out carefully. Make yourself a drift to replace the ring nice and square, the dims are in the thread and so is a description of my home made drift. Don't welt the ring in with the drift, it's only used to push the ring down firmly and square with just a tap to finally locate it.
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22-06-2020, 10:09 PM | #6 |
Bronze Member
Join Date: Jul 2006
Location: Poole
Bike: M900ie
Posts: 472
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Thanks for the info, The 93 version is a different casting to the 98, see inside the reservoir, also has anyone an insight to the 2 versions of the stubby push rod? the 93 has a slightly longer one compared to the ones I got with my smart new levers any thoughts? Also I'm not sure my replacement m/cylinder is duff, the no pump-action feels like something other than knackered seals, any ideas? bitza
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Bitza Last edited by Bitza; 22-06-2020 at 10:12 PM.. |
23-06-2020, 12:50 PM | #7 |
Bronze Member
Join Date: Jul 2006
Location: Poole
Bike: M900ie
Posts: 472
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Just in case there's anyone still out there who can find any interest in this thread?! an update, I noticed that if I put a finger over the m/cylinder outlet and pumped in it did make pressure, so I rigged it up to a loose rear caliper and hey presto it worked fine "on the bench". Back on the bike and it feels like nothing is happening, has anyone out there any bright ideas about how to bleed etc, cos I'm really flumucked (is there such a word?) Help Bitza!
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