 Caliper, Pistons |
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| shane |
 Dec 4 2020, 08:11 PM
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#1
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Member  Group: Members Posts: 355 Joined: 12-February 13 Member No.: 15,518 Region Association: None  |
I’m rebuild my front calipers and the pistons and cylinders look real nice but the tops of the pistons have a Little bit of rust on them. Has anyone blasted them and coated them with anything? Thanks
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Replies(1 - 6)
| mepstein |
Dec 4 2020, 08:16 PM
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#2
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914-6 GT in waiting Group: Members Posts: 19,876 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region 
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Eric shows what to do on his PMB site.
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| bbrock |
Dec 5 2020, 09:01 AM
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#3
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains
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QUOTE(mepstein @ Dec 4 2020, 07:16 PM)  Eric shows what to do on his PMB site. (IMG:style_emoticons/default/agree.gif) The process he describes is to clean them in a vibratory tumbler and paint the tops with gray high temperature paint. (IMG:http://www.914world.com/bbs2/uploads/post-20845-1544404071_thumb.jpg) (IMG:http://www.914world.com/bbs2/uploads/post-20845-1545618597_thumb.jpg) |
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| shane |
Dec 5 2020, 09:29 AM
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#4
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Member Group: Members Posts: 355 Joined: 12-February 13 Member No.: 15,518 Region Association: None |
QUOTE(bbrock @ Dec 5 2020, 07:01 AM) QUOTE(mepstein @ Dec 4 2020, 07:16 PM) Eric shows what to do on his PMB site. (IMG:style_emoticons/default/agree.gif) The process he describes is to clean them in a vibratory tumbler and paint the tops with gray high temperature paint. (IMG:http://www.914world.com/bbs2/uploads/post-20845-1544404071_thumb.jpg) (IMG:http://www.914world.com/bbs2/uploads/post-20845-1545618597_thumb.jpg) Thanks for the reply! Was thinking about a light coat of powder coat just to help protect the surface from future rust but read somewhere you shouldn’t powder coat any surface that touches the brake pads. I’m thinking zinc chromate was the original finish? I could do that but it’s a bit more work and time any thoughts? Thanks |
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| mepstein |
Dec 5 2020, 10:52 AM
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#5
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914-6 GT in waiting Group: Members Posts: 19,876 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Normal powder coat melts at 350 ish so heat might be a factor. Eric has done 10's of thousands so I follow his advise exactly or just have him do it.
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| bbrock |
Dec 5 2020, 11:10 AM
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#6
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains
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QUOTE(shane @ Dec 5 2020, 08:29 AM) Thanks for the reply! Was thinking about a light coat of powder coat just to help protect the surface from future rust but read somewhere you shouldn’t powder coat any surface that touches the brake pads. I’m thinking zinc chromate was the original finish? I could do that but it’s a bit more work and time any thoughts? Thanks Read Eric's how-to but this is supposed to replicate the original finish (no plating, high temperature gray paint on the tops). The housings were yellow zinc plated and that helps lubricate the pistons as they slide through the bores. The how-to is a must read for rebuilding calipers: https://www.pmbperformance.com/brakehowto.html and also watching Eric's excellent video on rebuilding rear calipers (it helps for understanding the instructions for the fronts too): https://www.youtube.com/watch?v=dm_DnizKOZM |
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| shane |
Dec 5 2020, 02:39 PM
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#7
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Member Group: Members Posts: 355 Joined: 12-February 13 Member No.: 15,518 Region Association: None |
QUOTE(mepstein @ Dec 5 2020, 08:52 AM) Normal powder coat melts at 350 ish so heat might be a factor. Eric has done 10's of thousands so I follow his advise exactly or just have him do it. Sure makes sense with the powder coat being a bit maybe possible not high temp enough. High temp paint is easy and I can still bake it a bit in a powder coat oven at least. Thanks for the advice! (IMG:style_emoticons/default/aktion035.gif) |
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