Why are my piston seals leaking and what to do?

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MikeD
Posts: 1006
Joined: Thu Dec 11, 2014 9:55 pm

by MikeD on Wed May 25, 2022 3:48 pm

tommyboyo wrote:
Attermann wrote: ↑
Wed May 25, 2022 12:08 pm
 New calliper it is, because shimano doesn't provide pistons and seals.
Pretty poor that this is 'fairly normal'!

I wonder if the next gen is better.
I don't believe it's fairly normal. Mine haven't leaked.
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PoorCyclist
Posts: 783
Joined: Wed Dec 07, 2011 1:26 am
Location: California's country side

by PoorCyclist on Wed May 25, 2022 3:50 pm

I see pistons you can buy from Ali
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by Weenie on Wed May 25, 2022 3:50 pm


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Attermann
Posts: 923
Joined: Sun Jan 05, 2014 11:04 pm
Location: Denmark

by Attermann on Wed May 25, 2022 9:20 pm

MikeD wrote: ↑
Wed May 25, 2022 3:48 pm
tommyboyo wrote:
Attermann wrote: ↑
Wed May 25, 2022 12:08 pm
 New calliper it is, because shimano doesn't provide pistons and seals.
Pretty poor that this is 'fairly normal'!

I wonder if the next gen is better.
I don't believe it's fairly normal. Mine haven't leaked.
I will call it as fairly normal like the cranks cracking.
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ghostinthemachine
Posts: 780
Joined: Thu May 07, 2015 9:18 pm

by ghostinthemachine on Thu May 26, 2022 2:20 pm

Except neither of those things are "fairly normal".
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tommyboyo
Posts: 350
Joined: Sun Jun 21, 2020 12:49 am

by tommyboyo on Thu May 26, 2022 2:46 pm

ghostinthemachine wrote: ↑
Thu May 26, 2022 2:20 pm
 Except neither of those things are "fairly normal".
I believe the piston seals leaking are far, far more common than the cranks cracking.

I hope so anyway!!
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PoorCyclist
Posts: 783
Joined: Wed Dec 07, 2011 1:26 am
Location: California's country side

by PoorCyclist on Thu May 26, 2022 3:56 pm

You seem to be able to buy the Shimano Calipers now, about 6 months ago I would be afraid of riding because no one have the any replacement calipers
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ooo
Posts: 1590
Joined: Sat May 21, 2016 12:59 pm

by ooo on Thu May 26, 2022 7:35 pm

Ceramic piston FM calipers (BR-R9170/BR-R8070/BR-R7070/BR-RS805/BR-RS505/BR-RX810) can be upgraded
to non-cracking non-ceramic pistons from inexpensive caliper donor (BR-4770/BR-RS405/BR-RX400)

I am calling this upgrade, because newer Dura-Ace/Ultegra BR-R9270/BR-R8170 calipers are using non-ceramic resin pistons, like Tiagra.

If you buy a new caliper to be used as replacement (not a donor), then get BR-R9270/BR-R8170/BR-R7170 or BR-4770/BR-RS405/BR-RX400.
'
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