04-15-2024, 03:29 PM | #1 |
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Aluminium pistons on 2NH calipers
I must edit this, the pistons are aluminum, they have a nickel coating, I checked it with a drill bit.
Last edited by Track/S; 05-14-2024 at 11:08 AM.. |
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04-15-2024, 11:49 PM | #3 |
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05-13-2024, 07:36 AM | #4 |
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Is there a piston rebuild kit? My pistons are corroded on the inside. I always try to clean them out well when I swap pads. I plan to rebuild the seals soon and thinking I might replace the pistons while I have it all apart.
Anyone have a part number(s) or a kit that can be ordered? I only see kits for the seals and boots from Girodisk. |
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05-13-2024, 08:04 AM | #5 | |
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Do you have any pictures of the corrosion? |
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05-13-2024, 05:00 PM | #6 |
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No I don't. It was only in the center hole of the pitons and appeared to be aluminum corrosion based on the white color and soft dusty appearance. Reminded me of the crap on top of a lead battery or something you might see on an old boat. I used a small wire brush in an attempt to clean them up the last time I swapped pads. Looked like salt and water gets in there an is trapped causing the corrosion.
I found these https://racingbrake.com/bb-62bsp/ and thinking this may be a good option. Seems BMW doesn't offer the pistons separate from the whole caliper. |
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05-13-2024, 05:11 PM | #7 | |
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Last edited by Track/S; 05-14-2024 at 11:09 AM.. |
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05-14-2024, 04:59 PM | #8 |
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I was surprised to read they had Ti pistons. You can usually tell the difference when holding/touching Al and Ti - Alum has higher conductance so heat transfer is much higher than Ti which makes Alum feel colder to touch (higher heat transfer from hot hand to cold Al). Ti doesn’t feel cold to the touch because it has a considerably lower thermal conductance and, therefore, it’s more resistant to heat transfer.
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05-14-2024, 11:46 PM | #9 | |
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05-15-2024, 03:13 AM | #10 | |
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Last edited by M3SQRD; 05-15-2024 at 03:20 AM.. |
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05-15-2024, 05:56 AM | #11 | |
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05-15-2024, 07:21 AM | #13 |
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05-15-2024, 08:12 AM | #14 |
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05-19-2024, 08:21 PM | #15 |
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Okay wait so just to confirm: all of the gold, anthracite, and red 2NH/2NK calipers are identical except for the color? And they all use alumnium pistons instead of titanium?
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05-20-2024, 12:27 AM | #16 |
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