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Author Topic: 2010 CalVin brake problem  (Read 3312 times)

Offline Stormtruck2

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2010 CalVin brake problem
« on: May 29, 2016, 05:32:50 PM »
2010 CalVin with 6,300 miles. Brake lever front brake works just fine.  Foot brake simply goes to the board, minimal braking effect.  Pump the brake and it builds up pressure and increases the braking effect. Once pressure is built up, holding the pedal steady, pressure falls.  I bled the front and rear calipers in the linked system.  Fluid looks clear and clean. I'm thinking master cylinder is shot already. Any other ideas or things I should check??
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Re: 2010 CalVin brake problem
« Reply #1 on: May 29, 2016, 05:44:55 PM »
I agree it seems early, but I had the same internal bleed down in the rear master of my 98 EV.  No leaks.  It just bleeds away internally back to the reservoir.  Not sure if yours uses the same rear master.  I got:

Yoyodyne. SKU 10.4776.65

also MGCYCLE or Harpers would have 31666990

Patrick Hayes
Fremont CA
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Offline Stormtruck2

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Re: 2010 CalVin brake problem
« Reply #2 on: May 29, 2016, 05:53:11 PM »
That's the same part number I got.  So you would agree that it is MC??
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Re: 2010 CalVin brake problem
« Reply #3 on: May 29, 2016, 06:00:13 PM »
Quote from: Stormtruck2 on May 29, 2016, 05:53:11 PM
That's the same part number I got.  So you would agree that it is MC??

Mine didn't occur until 80K miles, but those are the exact same symptoms.  I think it was cheapest at Yoyodyne and a direct replacement.

Only other question would be bleeding technique.  The linked system can be a bear.  I always have the best luck with a huge syringe and I push fluid backwards from the caliper, through the master, up into the reservoir.  Just have to be careful so as not to geyser it up onto the bike!

"Once pressure is built up, holding the pedal steady, pressure falls."  Sure sign of internal leakage past a seal.

Patrick Hayes
Fremont CA
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Offline rodekyll

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Re: 2010 CalVin brake problem
« Reply #4 on: May 29, 2016, 06:05:53 PM »
I'll agree that the m/c has failed internally.
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Offline Stormtruck2

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Re: 2010 CalVin brake problem
« Reply #5 on: May 29, 2016, 06:06:16 PM »
I use a Mighty Vac to vac it out, and my son also pumps the pedal and adds fluid as needed.
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Offline Chuck in Indiana

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Re: 2010 CalVin brake problem
« Reply #6 on: May 29, 2016, 06:14:39 PM »
They're not rebuildable? No doubt, it's just a seal.
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Offline Stormtruck2

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Re: 2010 CalVin brake problem
« Reply #7 on: May 29, 2016, 06:16:43 PM »
I have no idea if they are rebuildable.  Done a many on cars and trucks, but not a bike.  Wonder if I can find a rebuild kit??
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Re: 2010 CalVin brake problem
« Reply #8 on: May 29, 2016, 06:17:21 PM »
Quote from: Chuck in Indiana on May 29, 2016, 06:14:39 PM
They're not rebuildable? No doubt, it's just a seal.

No.  Lawyers got in the way.  Getting nigh impossible to find any source for brake internal kits.

Patrick Hayes
Fremont CA
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Offline Stormtruck2

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Re: 2010 CalVin brake problem
« Reply #9 on: May 29, 2016, 06:30:13 PM »
I found this site, but have no idea what part number I need for the proper rebuild kit.
http://www.cyclebrakes.net/rebuildkits.aspx
« Last Edit: May 30, 2016, 02:56:32 AM by Stormtruck2 »
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Re: 2010 CalVin brake problem
« Reply #10 on: May 30, 2016, 12:11:46 AM »
Quote from: Stormtruck2 on May 29, 2016, 06:30:13 PM
I found this site, but have no idea what part number I need for the proper rebuild kit.

Need to edit your post.  Would be nice if you included the link for us.   :laugh:

Patrick Hayes
Fremont CA
« Last Edit: May 30, 2016, 12:12:16 AM by pehayes »
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Offline Stormtruck2

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Re: 2010 CalVin brake problem
« Reply #11 on: May 30, 2016, 02:57:09 AM »
Quote from: pehayes on May 30, 2016, 12:11:46 AM
Need to edit your post.  Would be nice if you included the link for us.   :laugh:

Patrick Hayes
Fremont CA

Done.   :laugh: :rolleyes:
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If you wish to know what a man is, place in him authority.
False accusations reflect more on the accuser than the accused.
They can take everything from you, including your life, except your honor and integrity.  That you must give away.
Do or don't do. There is no try.
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Offline ejs

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Re: 2010 CalVin brake problem
« Reply #12 on: May 30, 2016, 03:02:37 AM »
This German shop sells internal brake parts.   :boozing:



http://www.gawa-guzzi.de/index.html
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Offline rodekyll

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Re: 2010 CalVin brake problem
« Reply #13 on: May 30, 2016, 03:30:37 AM »
Quote from: Stormtruck2 on May 29, 2016, 06:30:13 PM
I found this site, but have no idea what part number I need for the proper rebuild kit.
http://www.cyclebrakes.net/rebuildkits.aspx

https://issuu.com/klsupply/docs/2014_kl_catalog/291

This catalog company will tell you anything you need to know if you have the patience for it.  They're like the sears and robuck catalog of catalogs. 

I crossed a few of the numbers from your link to Hondas using their search feature.  Note that the catalog is hosted by this other site, so be careful what you're clicking on.  Also, I have never ordered form K&L.  I just use it to reference mystery parts.  Also be aware that most of the time "special order" means "we'll add the bean to the production run numbers and when we have enough we'll make some."  The rest of the time it means "we have the listing from another catalog, but who knows if it exists?
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Offline CPRMan

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Re: 2010 CalVin brake problem
« Reply #14 on: May 30, 2016, 08:20:10 AM »
Wow, so many parts I never knew I needed........ :drool:
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Offline rodekyll

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Re: 2010 CalVin brake problem
« Reply #15 on: May 30, 2016, 02:24:32 PM »
They make Grainers look like a 7-11.  But again -- I just use this site to ID mystery parts -- like when the ebay seller just lists a part number and I'm supposed to already know all about it.  I have never ordered anything from them. 

I think they have all the catalogs and listings for about everything on the planet, but I don't think any of it is THEIR inventory.  So don't take the listing as meaning the part is extant.  For example, NISSIN had a recall on GSRX front brake m/cs.  When they were recalled the kits became no longer available.  But the kits remained listed as 'special order' items in the dealer catalogs.  The recalled m/cs started showing up on ebay for dirt cheap.  It was a super way to get into radial master cyls.  So folks bought $200 master cyls for $20 thinking a $12 kit would solve the recall problem only to find out that the "special order" kits were NLA.
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