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 Rear calliper pistons

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McCarthy1983
Tanabuso
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McCarthy1983

Posts : 64
Join date : 2016-08-29
Age : 36

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PostSubject: Rear calliper pistons   Rear calliper pistons Icon_minitime1Sun Feb 09, 2020 12:19 pm

Had a new tyre fitted last week, so taken the opportunity to give the calliper a clean. 2 things I noticed. 1, only one piston moves when pressure is applied. When I block this piston, the other one then moves, is this normal. 2 the pistons are not shiny like I have seen on YouTube videos, albeit different brands of brakes. Are the Grisos usually shiny, ie stainless steel or are they made from something else
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McCarthy1983
Tanabuso
Tanabuso
McCarthy1983

Posts : 64
Join date : 2016-08-29
Age : 36

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PostSubject: Re: Rear calliper pistons   Rear calliper pistons Icon_minitime1Sun Feb 09, 2020 1:15 pm

Also, the spring. It fell out when I removed the pin, no can’t remember where it goes. The only logical place is it sits on top of the pads (when calliper is in position) at the pin end?
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McCarthy1983
Tanabuso
Tanabuso
McCarthy1983

Posts : 64
Join date : 2016-08-29
Age : 36

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PostSubject: Re: Rear calliper pistons   Rear calliper pistons Icon_minitime1Tue Feb 11, 2020 1:12 pm

Don’t like to bump, but can anyone provide assistance?
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Pete Roper
GRiSO Capo
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Pete Roper

Posts : 6826
Join date : 2013-05-29
Age : 63

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PostSubject: Re: Rear calliper pistons   Rear calliper pistons Icon_minitime1Tue Feb 11, 2020 1:23 pm

Sorry, I'll check on a spare today. It should be fairly self evident I think.
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rick pope
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rick pope

Posts : 118
Join date : 2019-08-17
Age : 66

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PostSubject: Re: Rear calliper pistons   Rear calliper pistons Icon_minitime1Tue Feb 11, 2020 5:35 pm

It's normal for only one piston to move when there's no resistance. One will have less "stiction", so will move.
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BrianD
Don Abbondio
Don Abbondio
BrianD

Posts : 54
Join date : 2015-12-19

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PostSubject: Re: Rear calliper pistons   Rear calliper pistons Icon_minitime1Wed Feb 12, 2020 4:38 am

I am pretty sure that the pistons are grey and if they are "free" then by holding a finger on one piston will allow the other piston to move and you should be able to push them back with your fingers.

If not they need a clean and rubber grease.

This may apply to GRiSO's - The metal spring plate - if you turn the caliper on its back (so to speak) there is a ridge that it locate onto, you tend to get a lot of road debris clogging this up [so clean before refitting]
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McCarthy1983
Tanabuso
Tanabuso
McCarthy1983

Posts : 64
Join date : 2016-08-29
Age : 36

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PostSubject: Re: Rear calliper pistons   Rear calliper pistons Icon_minitime1Thu Feb 13, 2020 1:00 pm

Thank you Pete, Brian and Rick. As always on this forum, got the answers. Here is a photo of the spring position. Hopefully this is right? Only logical place it could go. I assume purpose of to allow the pads to move slightly within the calliper under load. [You must be registered and logged in to see this image.]
[You must be registered and logged in to see this image.]
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McCarthy1983
Tanabuso
Tanabuso
McCarthy1983

Posts : 64
Join date : 2016-08-29
Age : 36

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PostSubject: Re: Rear calliper pistons   Rear calliper pistons Icon_minitime1Mon Mar 02, 2020 12:37 pm

Hi, just want to check the above rear calliper assembly was correct?
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