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Old 05-18-2014, 03:09 PM   #1
keener OP
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Holes on rear break pistons

This is a photo if rear break caliper of my 04 950 adv.

I have never seen anything like this.

There is no leak, break works fine.. Is this going to cause any issue?Name:  uploadfromtaptalk1400450900570.jpg
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Old 05-18-2014, 03:59 PM   #2
charlie264
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Just covers over the piston...some brakes just don't use um...not leaking fluid I wouldn't worry
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Old 05-18-2014, 04:57 PM   #3
gefr
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No problem

Has no specific use but to cover the "tube"-piston opening.
Cheers
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Old 05-19-2014, 04:09 AM   #4
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thx guys, I put a bit of caliper grease and buttoned it up.

I rode in a ton of muddy trails in the last couple of week.

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Old 05-19-2014, 06:20 AM   #5
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Quote:
Originally Posted by gefr View Post
Has no specific use but to cover the "tube"-piston opening.
Cheers


They do help prevent heat transfer into the brake fluid....
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Old 05-19-2014, 06:43 AM   #6
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I think their main use is to stop the piston filling with dirt and water and they also help insulate the piston from the pad heat.

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Old 05-19-2014, 07:47 AM   #7
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thank you.

whats the best practice to prevent this? grease will be washed off quickly.

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Old 05-19-2014, 11:41 AM   #8
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JB Weld and sand it flush?
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Old 05-19-2014, 03:34 PM   #9
HeatXfer
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Looks like water got in behind them and started corroding the faces from the inside-out.(?)
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Old 05-19-2014, 05:26 PM   #10
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What you see on the photo with the hole is plastic.

It corroded.
Cheers.
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Old 05-22-2014, 02:42 AM   #11
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it didn't look like the caps are steal. They seem to be some kind of plastic.

I think the vibration of pads sanded the ends in combination with sand from mud. Pads were worn 100%. So much that one fell off from one end by itself. They were just not the right pads for mud.

The springs are supposed to prevent this I guess ,but not when pads wear that much?!

new kind of pads are in and there is no play.
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