05-04-2018, 09:44 PM | #1 |
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M2 Brake Issue
I tracked my M2 at Watkins Glen and the car was wonderful, however, I have a bad rumble when I step on the brake pedal now, and a groaning noise. Second time this has happened...I am told this could be from the rotors glazing? It did go away the first time, but this time seems much worse. Has anyone else experienced this? This is unacceptable for a car that is advertised as a track-ready car. Should not happen. Also, how do I cure the problem?
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05-05-2018, 12:55 AM | #2 |
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Pad deposits after a track day - re-do brake pad bed in procedure should clean up the discs nicely.
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05-06-2018, 01:47 PM | #5 |
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If you ran with stock pads and stability control, the material has likely broken down a bit (chunked) and cracked. This will normally give you the grinding noise later, likely exacerbated with drilled rotors. It’s not M2 or BMW specific. If you take the pads off, you will likely see physical evidence of this.
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05-06-2018, 01:51 PM | #6 | |
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05-06-2018, 02:00 PM | #7 |
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05-06-2018, 04:01 PM | #8 |
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very hard to get a pad that can cover road and track well. Especially if you are going hard at the track. All track pads will screech sooner or later on the road and become annoying in city driving. And then road pads aren't up to it for prolonged track use. You may be finding it worse this time because you are going faster with a bit more familiarity.
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05-06-2018, 04:19 PM | #9 | |
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05-06-2018, 05:01 PM | #10 |
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Zero problems!
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05-06-2018, 05:05 PM | #11 |
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You are wrong! If BMW would fit trackpads as standard....they would get massive amount of complaints about everybody driving on the street with noisy brakes. The M2 is a street car not a track-ready car. It's a street car that you can also drive on track...if you fit different brake pads. You can order the M perf pads from BMW or go aftermarket for a solution.
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05-06-2018, 08:29 PM | #12 | |
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05-06-2018, 09:23 PM | #13 |
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05-07-2018, 01:43 AM | #14 |
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I ran into the same issue with stock pads. I ended up purchasing rs29s to scrape off the old deposits + my next hdpe event. My new issue was that I ended up boiling the stock fluid with the new pads, so now I have Castrol srf.
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05-07-2018, 02:13 AM | #15 | |||
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For me simply braking slightly worked within a few stops .. Quote:
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I was on track in my 1M and had this issue occur this weekend as well. I drove on track, decided to pack the stock wheels in the car and drive home on my track set. I didn't get far up the road and I slowed to stop at an intersection and got a crunching sound from the brakes pulling to a stop. This happened the next few times I braked so to mitigate it I simply used the brakes very lightly when coming to a stop. This yielded more squeak/squeal but less crunch. After about 15 miles of highway driving with a few stops in towns it didn't occur the rest of the way home. I ran Performance friction full race pads. I agree with the others above that you can try a re-bed as well. The issue definitely revolves around cross drilled rotors. These shred the pad to a degree causing small chunks to imbed in the holes of the drilled rotors. An odd size chunk of brake material in your rotor has the same effect as a rock against a backing plate. Reversing a short distance and slamming on the brakes is a good way to eject a rock stuck against a backing place and disc by the way, and also might be something to try. For decades, BMW eschewed cross drilled rotors in favor of solid discs and this was never an issue. Old school bimwads will recall that slotted rotors were very common on aftermarket rotors for track use. These also can suffer from pad material getting trapped in the slots as well. |
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05-07-2018, 02:39 AM | #16 | |
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Castrol SRF rocks. If you have an issue with that fluid .. then this is a driver problem. Braking less is faster ! |
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05-07-2018, 09:48 AM | #17 |
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For those that have swapped brake fluid for track. I'm assuming you just keep that in when on the streets and will continue to flush with track fluid? Can't think of any reason why not but figured I'd ask.
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05-07-2018, 04:10 PM | #18 | |
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If you get too much heat into the rotor with no cooling they won't stand the heat as well as a competition rotor. But is all a question of how hard you want to go - A few casual trackdays is ok - just try and see how it goes. |
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05-07-2018, 04:14 PM | #19 |
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yep just switch to track fluid permanently. SRF expensive but much better for a dd car as it resists moisture better. there other threads talking about this.
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05-21-2018, 03:28 PM | #20 | |
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05-22-2018, 01:29 AM | #21 | |
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http://www.ctbrakes.com/brake-fluid.asp |
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05-24-2018, 07:12 PM | #22 |
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I'm with the OP on this one. The standard pads BMW use are great for the road but shit anywhere else. I ran my Porsche on the track straight from the showroom and never had the issues I've had with BMW.
If you're still getting the grinding sound or vibrations, get the discs machined and swap pads. Simple rule, don't ever bother with the BMW pads on the track, swap them before going out along with better fluid. |
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