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Caliper Piston Plating


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#1 Tornado99

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Posted 25 January 2022 - 11:20 PM

Just got an order of new caliper pistons (local Canadian supplier, not MS) for a rebuild I plan to do soon. On inside wall of one piston, a good sized section seems to have the plating or chrome missing:
Attached File  IMG_20220125_1453214~2.jpg   33.59K   0 downloads
Should I be concerned that it might lead to corrosion to outside sealing surface?

Edited by Tornado99, 25 January 2022 - 11:21 PM.


#2 Spider

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Posted 25 January 2022 - 11:59 PM

It's not ideal. You'll find in time that moisture will get under the edges and cause rusting - as you suspect. No issue if it's on the inside, but you can be sure, it will travel once started, to the outside.

While quite a bit dearer, I prefer Stainless Pistons.



#3 Tornado99

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Posted 26 January 2022 - 12:45 AM

It's not ideal. You'll find in time that moisture will get under the edges and cause rusting - as you suspect. No issue if it's on the inside, but you can be sure, it will travel once started, to the outside.

While quite a bit dearer, I prefer Stainless Pistons.

Stainless was not offered by my local supplier.
I'm checking if he will send out a better one. Otherwise, I"ll likely install it as is and plan on ordering stainless at a later date from UK.

Edited by Tornado99, 26 January 2022 - 12:45 AM.


#4 Tornado99

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Posted 26 January 2022 - 06:35 PM

Retailer is going to send me a replacement piston so I will not use this one.




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