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      11-18-2015, 03:05 PM   #1
ONE_slow_m5
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Stoptech rotors causing shaking while braking.

Stoptech rotors causing shaking while braking. Pads still look good. can the Stop tech front rotors that are slotted NOT cross drilled be machined / turned? to smoothen them out?
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      11-18-2015, 03:11 PM   #2
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Mostly likely you got uneven pads deposit on it. Take a pic of the rotor. Will kind of be able to see it. Really hard to wrap those rotors.
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      11-18-2015, 03:12 PM   #3
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Quote:
Originally Posted by tlrid3r View Post
Mostly likely you got uneven pads deposit on it. Take a pic of the rotor. Will kind of be able to see it. Really hard to wrap those rotors.
i tried to slide my fingers on it . Feels ok/ even. I thought when its shaking the steering its usually always the rotors.
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      11-18-2015, 03:35 PM   #4
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here are some pictures.
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      11-18-2015, 04:09 PM   #5
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I pad-deposited two sets of OEM style rotors on my last car using Endless mx72 hybrid pads at the track (will never use those pads or any other hybrids again). That said I definitely could not feel the uneven-ness of the surface by running my finger across them. Then a buddy of mine recently told me the rotors on his M3 were warped, I told him no way, likely pad deposited. Anyway, we went to inspect them and the rotors had more metal rotor material in the center than on the edges. They were heavily used and near end-of-life measurements, so not sure if they were "warped," pad-deposited, or just oddly worn (or a combination of all three). He replaced them and it got rid of the vibration.

Generally though, I've found that a shaky steering wheel almost always points to pad-deposited rotors. What pads were you using?

Also, we called O'reilly's on my buddies car and they would not turn the drilled OEM rotors, not sure about slotted but likely the same answer.
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      11-18-2015, 05:18 PM   #6
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Quote:
Originally Posted by ///Mobbin
I pad-deposited two sets of OEM style rotors on my last car using Endless mx72 hybrid pads at the track (will never use those pads or any other hybrids again). That said I definitely could not feel the uneven-ness of the surface by running my finger across them. Then a buddy of mine recently told me the rotors on his M3 were warped, I told him no way, likely pad deposited. Anyway, we went to inspect them and the rotors had more metal rotor material in the center than on the edges. They were heavily used and near end-of-life measurements, so not sure if they were "warped," pad-deposited, or just oddly worn (or a combination of all three). He replaced them and it got rid of the vibration.

Generally though, I've found that a shaky steering wheel almost always points to pad-deposited rotors. What pads were you using?

Also, we called O'reilly's on my buddies car and they would not turn the drilled OEM rotors, not sure about slotted but likely the same answer.
If they won't turn them I'll just replace them. Have a brand new set of stop tech pads at the house. Rotors are about 400 a pop
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      11-18-2015, 09:11 PM   #7
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Shake and Brake baby! shake and brake.
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      11-18-2015, 09:21 PM   #8
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+1 on pad deposits. I get vibration sometimes after track events and sometimes even after just street driving. I do a similar procedures to bed-in where I get up to like 100mph and progressively get on the brakes harder and harder. First stop is mello just to warm the brakes. Then I get back up to 100mph and get on the brakes again...slowly at first and then progressively harder until I start losing traction in the tires. Do this a couple times and voila no more vibration. Just make sure to cool down the brakes for about 15 minutes before parking the car. And don't use the parking brake.
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      11-18-2015, 09:28 PM   #9
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What pads? Any track use? I get shaking on mine periodically harder use usually fixes that depends on pad an mot of them, as well as your braking style. New track drivers tend to be harder on brakes than experienced even though slower. Seems counterintuitive I know.
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      11-18-2015, 09:31 PM   #10
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Quote:
Originally Posted by Longboarder View Post
+1 on pad deposits. I get vibration sometimes after track events and sometimes even after just street driving. I do a similar procedures to bed-in where I get up to like 100mph and progressively get on the brakes harder and harder. First stop is mello just to warm the brakes. Then I get back up to 100mph and get on the brakes again...slowly at first and then progressively harder until I start losing traction in the tires. Do this a couple times and voila no more vibration. Just make sure to cool down the brakes for about 15 minutes before parking the car. And don't use the parking brake.
I tried that, may just change the pads
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      11-19-2015, 09:07 AM   #11
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Rotors do look good but still a few more variable. Tough to say now. So it only shake during braking right?
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      11-19-2015, 10:27 AM   #12
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Got any full track pads? If so, swap them in and run them on the road for a couple weeks. They're more aggressive and will continue scraping the rotor rather than heating up to the point of laying down new deposits up to a higher temperature than street pads, so if your issue is indeed uneven pad deposits (which it very likely is), then they should take care of that fairly quickly.
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      11-19-2015, 10:29 AM   #13
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Got any full track pads? If so, swap them in and run them on the road for a couple weeks. They're more aggressive and will continue scraping the rotor rather than heating up to the point of laying down new deposits for longer, so if your issue is indeed uneven pad deposits (which it very likely is), then they should take care of that fairly quickly.
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      11-19-2015, 10:35 AM   #14
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Quote:
Originally Posted by jphughan View Post
Got any full track pads? If so, swap them in and run them on the road for a couple weeks. They're more aggressive and will continue scraping the rotor rather than heating up to the point of laying down new deposits for longer, so if your issue is indeed uneven pad deposits (which it very likely is), then they should take care of that fairly quickly.
I've heard of this before but never tried it myself. Usually people say Hawk blues will work for this as they are extremely abrasive, though I imagine other full track pads will work as well.

Another thing you can do is measure the rotor at various points from the inside to outside to see if the surface has become uneven. This would also likely be apparent from running your finger along the rotor though.
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      11-19-2015, 12:12 PM   #15
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http://www.stoptech.com/technical-su...nd-other-myths
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      11-19-2015, 12:16 PM   #16
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Quote:
Originally Posted by ///Mobbin
Quote:
Originally Posted by jphughan View Post
Got any full track pads? If so, swap them in and run them on the road for a couple weeks. They're more aggressive and will continue scraping the rotor rather than heating up to the point of laying down new deposits for longer, so if your issue is indeed uneven pad deposits (which it very likely is), then they should take care of that fairly quickly.
I've heard of this before but never tried it myself. Usually people say Hawk blues will work for this as they are extremely abrasive, though I imagine other full track pads will work as well.

Another thing you can do is measure the rotor at various points from the inside to outside to see if the surface has become uneven. This would also likely be apparent from running your finger along the rotor though.
I have a set of brand new stoptech pads I'm going to install today
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      11-19-2015, 12:38 PM   #17
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Quote:
Originally Posted by Blown__m3 View Post
I have a set of brand new stoptech pads I'm going to install today
If they are just Stoptech street performance pads I don't think they'll be abrasive enough to scrape the pad deposits off.
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      11-19-2015, 12:39 PM   #18
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Quote:
Originally Posted by ///Mobbin
Quote:
Originally Posted by Blown__m3 View Post
I have a set of brand new stoptech pads I'm going to install today
If they are just Stoptech street performance pads I don't think they'll be abrasive enough to scrape the pad deposits off.
Just checked. They are street performance
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      11-19-2015, 09:56 PM   #19
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I had a similar issue with vibration. I was ready to get new rotors but still believed those that said pad deposits. I instead just put on PFC08 pads and in about 1-2 weeks everything was back to as smooth as butter. Money for rotors saved. And a good set of track pads for the weekends.
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      11-19-2015, 10:01 PM   #20
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Quote:
Originally Posted by Dr.Mark View Post
I had a similar issue with vibration. I was ready to get new rotors but still believed those that said pad deposits. I instead just put on PFC08 pads and in about 1-2 weeks everything was back to as smooth as butter. Money for rotors saved. And a good set of track pads for the weekends.
Did you install these on OEM rotors and calibers or Stoptech?
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      11-20-2015, 12:29 PM   #21
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Did you try re-bedding?
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      11-22-2015, 05:08 AM   #22
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Spray the rotors with water (like you would when you clean your wheels) and let it sit over night. The rotor surface should rust up a bit. Drive. Fixed.

If you still insist...I'll be happy to buy your wasted, warped rotors.

Pad deposits are a very good possibility if you are using the Stoptech Street pads
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