01-25-2022, 09:11 PM | #1 |
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Looking for pictures of damaged 2NH calipers/wheel barrels from stones.
In an effort to possibly avoid scoring my new wheels with the bigger 2NH calipers, I'm looking for pictures that show where the stones normally get trapped and cause damage to the caliper and wheel.
My thought process is that I may be able to remove a bit of the 2NH caliper material to keep the scoring from happening because the caliper is extremely beefy, but not knowing where the damage is occurring means I'm just guessing. If you have any pictures of your damaged 2NH calipers, I would appreciate you posting them. Or if you know where the problem lies, I would appreciate your input, or thoughts in general about how to keep this from happening. Thanks in advance for any input. |
01-26-2022, 12:47 AM | #2 |
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Urban Myth : 2NH Brake Calipers Causing Scoring
G’day
One of our Compatriots in Sydney extensively tracks his M2 C with 2NH Brakes on multiple occasions every weekend and reports nil issues whatsoever. I have a M2 CS and no problems also . Whilst it’s possible I’d say it’s very rare unless your driving on gravel roads or “off piste” . Cheers Bruce |
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01-26-2022, 12:50 AM | #3 |
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I'm somewhat in the same boat as I'll be mounting BBS FI-R wheels this summer. I recently swapped over from the silver to red 2NH. Had one score on the drivers side lower end of caliper and small nicks on the upper part. With the way the wheel is spinning it looks like the lower is the most common entry point. It left a light 6" scratch on my 788M wheel.
Taking material off is one way but how much? The clearance is so tight already it would take quite a bit. Then there is the possibility of an even larger rock getting wedged in there. Custom caliper bracket to go down to a 380mm rotor would be nice or some sort of deflector on the bottom maybe? I feel like I might just end up biting the bullet and taking the risk if I don't come up with something. |
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01-26-2022, 06:56 AM | #4 |
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Some sort of scraper I think would be the best idea. We use scrapers on the front hubs in our motocross program. Slower speeds on roads that have some gravel create the problem. I have one scored wheel on the CS.
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01-26-2022, 08:22 AM | #5 | ||
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Thanks for your reply. However, I have spoken with many people regarding this, and the problem is very common, and certainly not limited to gravel roads. Some of these owners' cars have never seen gravel or rain. So I would count yourself lucky. Quote:
I think taking the risk with normal wheels would probably be fine, especially if the barrel is silver and the scores are hardly noticeable. However, my BBS FI-R wheels are Diamond Black, which have a dark barrel, and BBS recommends replacement if the score is 1mm deep, so I am unable to take the risk. Great idea, I had not heard of it before. Do you have a picture of said scraper? |
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01-26-2022, 11:41 AM | #6 | |
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01-26-2022, 11:45 AM | #7 | |
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It's interesting that your thinking is that the gap is too big, allowing rocks to stick in there. I never thought of it that way. I guess there is a zone there; too much gap is obviously fine, and almost no gap is fine, but precisely the gap we have isn't fine. |
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01-26-2022, 12:09 PM | #9 | |
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01-26-2022, 12:46 PM | #10 |
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01-26-2022, 07:47 PM | #11 |
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OK, so I think I've found the motherload thread about this...from 2015.
https://f80.bimmerpost.com/forums/sh....php?t=1107233 And apparently there has never never been any attempt from BMW to fix the issue, even though multitudes of owners have had this problem (and CCB owners, not just standard 2NH owners). Also interesting is that many manufacturers have this problem, but Pagani and Koenigsegg are the only ones to put forth a solution. |
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01-26-2022, 08:18 PM | #12 | |
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01-26-2022, 08:47 PM | #13 | |
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01-27-2022, 08:17 AM | #15 | |
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I'm still buying a set of 2NH, but won't fit them until I find a solution. What you've shown me seems like something that could be 3D printed quite easily. It's the same with the 437 and 763, and the same (no issue) with BC Forged KL01 and KL11, no issues there at all, the barrels are made for larger brakes. |
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01-27-2022, 10:16 AM | #16 |
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That's what I thought. 3D print a part that would extend into the barrel of the wheel to divert the small stones that are the issue. Somehow mounted off the pinch bolt area?
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01-27-2022, 10:26 AM | #17 |
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Yes, absolutely. Or even lower somehow.
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01-27-2022, 11:49 AM | #18 |
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Yeah, but the stones must enter from the top given the forward rotation of the wheel. Mounting something towards the top of the wheel barrel just in front of the caliper there would be the ticket. You would almost have to mount it via the lower pinch bolt or design something that would mount around the bottom of the shock.
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01-27-2022, 11:53 AM | #19 |
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01-27-2022, 01:00 PM | #20 |
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Just throwing some ideas around. Possibly use the brake line as a mounting point. Cut some thin ABS sheet similar to DIY mud flaps. Put some holes to secure it behind and onto the brake line with zip ties. Would take some trial and error but could work. Excuse my terrible attempt at a Microsoft Word drawing.
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01-27-2022, 01:16 PM | #21 | |
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01-28-2022, 06:00 PM | #22 |
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Finally a constructive thread here about this, not just 'it's a myth lolz'.
I've got 2 scatches like the second picture from EtotheD on my left side caliper, and 3-4 light scratches inside the left 788 wheel. Right side is OK. Only 3,300km from new, never driven on gravel, never tracked (yet), never driven in rain. I know that stone scrapers have been pretty much standard on gravel rally cars as long as there have been gravel rally cars with disc brakes and aluminium or magnesium wheels, i.e. over 50 years. So this doesn't need a 'new' solution. I've looked at the bottom edge of the front calipers to assess the viability of fabricating some scrapers/deflectors, but it's a tricky shape with no flat surfaces and the crossover pipe going through there too. Thought about moulding some on the caliper itself with wheel in place using hard-setting liquid polyurethane and temporary dams, then grinding some clearance onto the 'blob' once set. 3D printing some in a high temperature plastic or sintered metal would likely be the best solution, and I don't have the gear for that. |
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