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Old 04-05-2015, 01:25 AM   #1
Neuteke OP
Joined: Oct 2014
Oddometer: 13
ATE Caliper Pitting Question


I've disassembled one of my ATE calipers ( 40mm) and found that there was some pitting:

The question is, is this still useable or not? The pitting seems to be between the round seal and the dust cover. The seals need to be replaced in any case so really the question is if i should order the kit with or without the piston from motobins. If anyone has experience with their non-OEM-part (, feedback is also very welcome!

I still need to do the second caliper, fingers crossed that that one comes out sparkling clean
Thanks in advance!
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Old 04-05-2015, 01:38 AM   #2
Studly Adventurer
Joined: Feb 2013
Oddometer: 809
It's usable because the pitting is not far enough down to contact the main seal. I would polish it out and reassemble using brake grease rather than brake fluid to protect that end of the piston under the dust cover.
A man haunted by a fixed idea is insane. He is dangerous even if that idea is the idea of justice - Joseph Conrad
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Old 04-05-2015, 04:55 AM   #3
Beastly Gnarly
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Joined: May 2012
Location: VA
Oddometer: 1,556
It looks serviceable. I would get some paste metal polish (I use Maas) and polish the pitted areas until they are smooth then apply some Naval Jelly to convert the rust. During assembly, a light coating of silicone brake grease can protect the pitted areas near the boot. You got lucky.
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Old 04-09-2015, 03:23 AM   #4
Neuteke OP
Joined: Oct 2014
Oddometer: 13
Thanks for the replies! The second piston came out better than this one, i'll polish both and apply the grease when re-installing them. I've got new brake pads and seals coming in from Motobins.

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