04-03-2024, 09:43 AM | #1 |
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brake pads
So my car is getting the front brakes replaced under warranty for the second time in 20000 miles, with the last set only lasting 1800 miles before getting "warped". Seems this is a wide spread issue with the 2NH brakes, and particularly the pads BMW uses. So I'm thinking, when I pick up the car from the dealer later today, I should replace the pads pretty much immediately to save the rotors. Is there a good pad that doesn't dust as much as the stock ones and has decent bite? The car isn't tracked so I don't need anything super fancy.
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04-03-2024, 09:47 AM | #2 |
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this is strange as modern rotors don't really warp easily and specially with 1800 miles. This is probably pad deposits from the stock pads (also strange since you don't track). I am surprised they just been replacing your rotors. But yeah Id put different pads on there that are not known to easily leave deposits, I forget now but there is a low dust pad that everyone loves here.
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04-03-2024, 09:55 AM | #3 | |
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04-03-2024, 05:50 PM | #4 |
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Carbotech 1521. great for street, little dust, no noise. no track though
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captain slowly721.50 KevinC3190.50 |
04-03-2024, 05:57 PM | #5 |
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I think you might be good to take it to a good indie shop to look it over. As MooMoo noted, most likely is pad deposit or incomplete bedding in, not real warpage. True warping is pretty rare, and almost always the result of something causing uneven rub/heat; common culprit is a pad on one side stuck out so it stays on the disc, while the other side retracts. It can also be from miniscule imperfections that leave the disc not exactly true to the axis of rotation. Another option could be that you don't heat things up enough to loosen up the disc pins and they get corroded in place. Either way, if the dealer is just throwing pads and rotors at it they aren't addressing it. Factory M pads are not the typical low-buck oem junk, so I doubt they are the problem - but if they are, then it is pad deposits not warpage.
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04-03-2024, 07:52 PM | #6 | |
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1. Modern brake rotors do not warp unless you run off the track into a cold lake. 2. What's happening is that the OE pad used by BMW actually needs to be bedded in, and done in a very specific way, otherwise the pad deposits on the rotor get uneven and cause pulsation. 3. CarboTech 1521 is the best street pad on the planet for the 2NH with no noise, vastly less dust, and they'll double the life of your rotors (make sure to use the OE rear pad shim, but not the front). The 1521 is perfectly happy in the canyons as well, but they are not meant for HPED or track use. 4. The stock pad is progressive, meaning the more heat they get in them the harder they bite, even if you don't add pedal. The 1521 is linear, meaning they stop much more evenly. Linear pads are preferred by most. 5. Initial bite with the 1521 is good, as is rain performance. 6. The 1521 does not need bedding in, just 300 easy street miles. |
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04-03-2024, 08:58 PM | #7 | |
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Other than this behavior, it was fine. |
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04-03-2024, 09:51 PM | #8 | |
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Having said this, no matter what you do, don't go CCB, they're vastly worse in wet conditions. |
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04-04-2024, 05:20 AM | #9 | |
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04-04-2024, 05:26 AM | #10 | |
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04-04-2024, 07:02 AM | #11 | ||
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I would advise you don't bed/use them at all. Park the car or drive it normally until you get your new pads. Lastly, I don't believe they changed the pad enough to make a difference, as it isn't in their interest to do so. Quote:
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04-04-2024, 07:03 AM | #12 |
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Id leave the discs, unless you were tracking the car and wanted a 2 piece the stock discs are more than find (they are fine on track too), just replace the pads. Pagid is hate it or love it, some love em others hate em so ymmv
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04-04-2024, 08:23 AM | #13 | |
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04-04-2024, 08:25 AM | #14 |
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I meant if the stock ones had pad deposits and needed to be replaced anyway, I'd spring up for the Girodisk as they are lighter, and as childish as it sounds, look badass.
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04-04-2024, 09:11 AM | #16 |
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04-04-2024, 11:24 AM | #17 |
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04-04-2024, 11:26 AM | #18 |
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This pad material is a type of NAO. They had to change from the older semi metal formulation to meet Euro 6 or some other EU/ECE requirement a while back. I don't think this is an ideal pad as far as engineering alone is concerned.
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04-04-2024, 07:53 PM | #19 |
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so bmw did change the part number. Last time they replaced my brakes in October, they used part number 34-11-2-284-869. Today they used 34-11-9-502-904. From googling I can't tell what the actual difference in pad material is, but it's definitely a different pad.
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04-04-2024, 08:02 PM | #20 | |
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04-04-2024, 08:03 PM | #21 | |
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04-04-2024, 08:11 PM | #22 |
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