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I went to reassemble my calipers and found this scratch on one of the pistons:
I can definitely feel it with a fingernail. Is this piston scrooged, or can I potentially buff it out with some 1200 grit (or higher) sandpaper? If I go that route, how much do I need to worry about things being out of round? My understanding is that these are hard anodized parts. Will polishing kill the part?
I'd like to avoid buying a brand new piston but will defer to the wisdom here on the forum.
I went to reassemble my calipers and found this scratch on one of the pistons:
I can definitely feel it with a fingernail. Is this piston scrooged, or can I potentially buff it out with some 1200 grit (or higher) sandpaper? If I go that route, how much do I need to worry about things being out of round? My understanding is that these are hard anodized parts. Will polishing kill the part?
I'd like to avoid buying a brand new piston but will defer to the wisdom here on the forum.
Thanks
Caliper kits, from Porsche. come with the pistons and they are not terribly expensive....
I've got a box full of pistons. If you measure the OD, I'd be happy to see if I have that size and give you one...just pay shipping.
Thanks Greg, I'd be much obliged. This is one of the 30mm pistons from the rear calipers.
I'll PM you with details for shipping and an e mail address, if you accept PayPal.
Cheers
Just checked. I do have a nice one.
Contact Mary at MaryBBRD@att.net or 714 879 9072 and she will send it.
I think the post office is the cheapest way to ship, these days.....she will know.
Great move Greg - this is what makes this board so valuable.
Still the question is out there - does that scratch render that piston junk?
That's a strange scratch, in that plane, right?
Not sure how that even got there...
In theory, if that scratch aligned perfectly with the square rubber piston seal, when it turned into a parallelogram, it could leak fluid.
Not high odds, but if he can get one for the price of shipping it....why worry about it?
Would I leave it in, in today's world of extreme liability exposure, combined with my own high standards?
Not a chance....it's the brakes!
I agree, Greg, that in addition to aspirations to the kinds of standards that you set, the overall concern around such a critical system is what prompted the question in the first place. I am extremely thankful for your offer to help me with this part and will feel much better from a safety perspective, but also knowing that, if I do things right, this should be in good shape for a long time to come.
I like working on my cars and upgrading/restoring things when I can but I also have to be honest that I much prefer to drive the things, so avoiding the need to revisit work is high on my list of priorities.
I agree, Greg, that in addition to aspirations to the kinds of standards that you set, the overall concern around such a critical system is what prompted the question in the first place. I am extremely thankful for your offer to help me with this part and will feel much better from a safety perspective, but also knowing that, if I do things right, this should be in good shape for a long time to come.
I like working on my cars and upgrading/restoring things when I can but I also have to be honest that I much prefer to drive the things, so avoiding the need to revisit work is high on my list of priorities.
01-07-2021, 12:36 PM
Scratch on caliper piston - terminal?
