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Old 06-17-2022, 11:55 AM   #1
VolvoLatAm
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Default rear girling calipers, different pistons?

volvo 244, 1982: I have 1 left and 1 right rear girling brake caliper. I JUST noticed the pistons are a different style. Does anybody have any insight if these can be used in parallel or if one side will grab harder than the other? I am guessing one is the older style piston.

https://imgur.com/a/NM8iLfW

up close:
https://imgur.com/a/Lax20yY

Last edited by VolvoLatAm; 06-17-2022 at 02:29 PM..
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Old 06-17-2022, 12:05 PM   #2
Redwood Chair
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The piston is upside down?
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Old 06-17-2022, 12:29 PM   #3
VolvoLatAm
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The piston is upside down?
more pics up close:https://imgur.com/a/Lax20yY
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Old 06-17-2022, 01:21 PM   #4
hiperfauto
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The spacer inside the piston is used in lieu of the thin metal shim between the pad and piston. According to the parts catalog the piston is the same part number.
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Old 06-17-2022, 02:27 PM   #5
VolvoLatAm
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Anybody replaced one rear girling caliper with the newer type while running the old type on the other side? need to grab my caliper from the workshop but the spacer looks slightly different in size even if the piston size is the same

Last edited by VolvoLatAm; 06-17-2022 at 02:34 PM..
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Old 06-17-2022, 03:07 PM   #6
2manyturbos
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Originally Posted by VolvoLatAm View Post
Anybody replaced one rear girling caliper with the newer type while running the old type on the other side? need to grab my caliper from the workshop but the spacer looks slightly different in size even if the piston size is the same
That would make no difference in braking clamping force, if that is what you are thinking.
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Old 06-17-2022, 03:14 PM   #7
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That would make no difference in braking clamping force, if that is what you are thinking.
that's all I am trying to figure out yeah...don't want one side gripping more/faster than the other. I understand the pads are the same size that get gripped..was wonder if that space affected anything
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Old 06-18-2022, 08:55 AM   #8
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That would make no difference in braking clamping force, if that is what you are thinking.
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Originally Posted by VolvoLatAm View Post
that's all I am trying to figure out yeah...don't want one side gripping more/faster than the other. I understand the pads are the same size that get gripped..was wonder if that space affected anything
I'm not familiar enough with what the brake pistons should look like, but I do know the following, but it seems like this isn't quite the point of contention (are you discussing what looks to be like a metal disc of smaller diameter on the middle of the piston?):

if one piston face (where it sees hydraulic fluid) has twice the surface area of the other, it will experience twice the push force. So if the piston faces on hydraulic side are different size then they will get different push forces (while also needing different displacements to move the same distance). So with the example given, one piston would apply twice the force as the other, which means one pad would be pushed down twice as hard as the other which would generate uneven force application.
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