Author Topic: Rear brake piston leak  (Read 491 times)

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Offline DC Concours

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Rear brake piston leak
« on: July 23, 2017, 12:15:22 am »
It's not dripping. Just a some wetness around the piston. Can I ride the season with this? Is it critical?


https://www.dropbox.com/s/3nzhy0c2d6vzmpl/20170611_175057.jpg?dl=0




Offline Freddy

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Re: Rear brake piston leak
« Reply #1 on: July 23, 2017, 09:14:52 am »
Yes, if your very brave.  Yes.
The best substitute for brains is ..............what?

Offline WillyP

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Re: Rear brake piston leak
« Reply #2 on: July 23, 2017, 01:49:02 pm »
That doesn't look like much fluid coming out, but at some point it's going to get worse. Your guess is as good as anyone's.
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Offline Mettler1

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Re: Rear brake piston leak
« Reply #3 on: July 23, 2017, 03:24:11 pm »
    $21 parts and some cleaning and yer done. A little brake fluid bleeding.  Get the rear brake parts.  :beerchug:

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Offline DC Concours

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Re: Rear brake piston leak
« Reply #4 on: July 23, 2017, 03:45:53 pm »
Thanks. that is a cheap fix.

Not knowing how all the seals work in there, as it is now, could this bust out leaking during emergency braking when I slam on the brakes?

Offline connie_rider

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Re: Rear brake piston leak
« Reply #5 on: July 23, 2017, 04:56:21 pm »
You can get another rear bake caliper on Ebay for pretty cheap, or buy a front caliper (modify it a bit) and install it on the rear.
Works good.

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Online MAN OF BLUES

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Re: Rear brake piston leak
« Reply #6 on: July 23, 2017, 05:59:00 pm »
Thanks. that is a cheap fix.

Not knowing how all the seals work in there, as it is now, could this bust out leaking during emergency braking when I slam on the brakes?

Doubtful. I mean, I doubt youlle have a catastrophic failure from what is seen...
Its a real simple seal ring,
But unless you remove the caliper, (leaving the hose attached) and the pads, and peel back the boot to examine just what exists, which only takes a few minutes, you don't know really what is going on there... it doesn't appear to ke to be a "catastrophic" event, not even sure its really brake fluid from the picture, could be some lube from the 2 guide pins in that picture...
Remove it, (hose attached), peel off the bellows, examine, clean, and reinstall it at least...and then keep an eye on it.

I wouldn't buy a caliper off ebay until or unless I knew mine was roached totally internally... chances are, the one you buy, seeing as its been off whatever bike it came from for a while, will be in worse shape than yours... at the least, if I did buy one, id rebuild it prior to install just on general principle....
« Last Edit: July 23, 2017, 06:33:17 pm by MAN OF BLUES »

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Offline mnbikeguy

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Re: Rear brake piston leak
« Reply #7 on: July 23, 2017, 06:25:26 pm »
People get by with differing all kinds of maintenance but that doesn't make it the smart choice. Never short yourself when it comes to brakes or tires.

Offline DC Concours

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Re: Rear brake piston leak
« Reply #8 on: July 23, 2017, 07:09:31 pm »
Thank you MOB. I will inspect this closer.
I just happened to see this when I was adding air. Can I blast some brake cleaner w/o damaging the rubber bits in there?


 

Online MAN OF BLUES

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Re: Rear brake piston leak
« Reply #9 on: July 23, 2017, 10:03:00 pm »
BrakeKleen is not harmful to use if you allow it to evaporate after using and wiping...
As I noted, pull it, clean it, replace it....
So if you are asking me if you can just spray a bunch on, and inside the bellows, without examining...

All I can say is do what you think is best... :-[ :-X

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Offline DC Concours

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Re: Rear brake piston leak
« Reply #10 on: July 23, 2017, 10:30:38 pm »
I will definitely examine it. But I need to clean it out too and I know brake cleaner solvents can be harsh on rubber especially on rubber that is old to begin with. I don't want to add to the fatigue.