06-01-2016, 08:05 PM | #1 |
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Brake judder
So I went to the track a week ago and had a great day. I drove the car hard and used the brakes hard. No fade the entire time. For sure a more aggressive pad would have been nice but the stock pads held up fine given that I was running the stock MPSS and that this was my first time out. After every session I did a full cool down lap with no brakes and then when off the track I did further cool down before parking to make sure that brakes were nice and cool. Despite all of my precautions I have uneven pad deposit and brake judder on both the front rotors.
So rather than ask the question on how to solve this short of new rotors and pads what I really want to know is how do I prevent this in the future? In this case I had about 1500 miles on the pads and took the first fews laps relatively lightly. Did extensive cool downs too. Advice please. |
06-02-2016, 03:26 AM | #2 |
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There is not a lot you can do about this... as you mention it is very likely pad deposits on the rotors and something that is simply common when street pads are used at the track. Give it a week or two of normal driving and it will go away. Outside of the precautions you already noted, I haven't found a way to avoid this (outside of being easier on the brakes at the track) with OEM pads.
I have found that track pads are far less prone to this issue. Also, they are so abrasive when cold that they naturally clean the rotors themselves on the drive home. No new rotors needed... just pads swapped before track days.
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06-02-2016, 05:35 AM | #3 |
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Agree track pads. You may be able to find a compromise pad that is able to handle the track work you do (since the factory pads seemed to provide the stopping power ok) and use for DD as well. Other wise if you go aggressive track pads you will definitely have to swap out again for street.
If street driving a few days doesn't clear the problem you could take some fine sand paper and lightly sand off the deposits on the rotor. |
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06-03-2016, 12:51 PM | #6 |
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As others have said, street pads are for the street, and track pads are for the track. When you exceed a pad's Max Operating Temperature (MOT), they tend to break down and smear on the discs (or come off in chunks). Once that happens, it can be tough to cure. Street pads have a relatively low MOT. Track pads have a much higher MOT, and tend to adhere to the disc in a uniform manner up to far higher temps.
We have some great track/race pads for the M2...Ferodo DS1.11. You can see the details on our site. Friends don't let friends drive street pads on the track...wish I had a better answer for you. Sorry brother! |
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05-21-2017, 04:47 PM | #7 | |
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05-21-2017, 05:00 PM | #8 |
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4 new rotors covered under warranty. Track pads after that and I haven't had the issue since.
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05-21-2017, 05:03 PM | #9 |
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Which track pads? On OEM rotors? Do you switch back and forth between track events and DD? What if any break in procedure do you use when switching pads? And the big question - are you judder free?
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05-21-2017, 05:17 PM | #10 |
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Carbotech XP10 in front and XP8 in the rear.
Yes. Yes. None other then original bedding procedure the first time. I've heard that this is not recommended. But I have had no issues and just ran at the track yesterday with no issue. Yes. |
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05-22-2017, 08:00 PM | #11 | |
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05-24-2017, 04:42 PM | #12 |
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Did my second trackday today with the OEM pads. After the first time I had the same problem with the pad deposits. Now the problem has disappeared. Consistent feel and no judder anymore, despite heavy breaking (Zolder). Did about 6 sessions of 6 laps at 80%. Michelins held up fine as well. In the future track pads and brake fluid will be a necessity though...
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05-24-2017, 09:48 PM | #13 | |
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05-27-2017, 08:08 AM | #14 |
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Bmw doesnt warranty for track use does it? So did they replace under warranty assuming these pad deposits were acquired under normal road usage?
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05-27-2017, 08:35 AM | #15 | |
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06-02-2017, 12:28 PM | #17 |
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I have not tracked my car or really leaned on the brakes very hard and I have what I think is judder. When the rotors get hot the brakes make a howling sound/ sensation. It happens when stopping from highway speeds.
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06-04-2017, 01:20 PM | #19 |
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As long as you don't exceed the max. operating temp of the pads you will be fine. You will need to manage your brake well to keep them from getting too hot. If you want to keep the pads on, these are your best choice. Otherwise a full track pad like the DS1.11, RS29 or PFC08 will be better suited for the application.
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06-04-2017, 02:46 PM | #20 |
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Also got 4 new rotors and brake pads last Friday, replaced under warranty.
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