Brake Deposits Haven't Gone Away

SanFranciscoM3 · 06-20-2019, 04:40 PM

I've read the posts on brake deposits vs rotor warpage.

If my shudder under breaking hasn't resolved after 25 days of driving (maybe 1000 miles total, usually road trips) over 1 year, does it definitely mean that my rotors are warped and need to be replaced? My shop initially said it was rotor deposits but now are saying its warped rotors because it hasn't gone away.

I've read about getting race pads to clean off deposits but that seems like kind of a PITA vs using an aggressive technique to get the deposits off with OEM pads.

FYI 2008 E92 M3, garage queen, 30,000 miles.

derbo · 06-20-2019, 04:51 PM

I would suggest trying the bedding in with race pads solution first.

https://www.apcautotech.com/getmedia...c-8-2018_1.pdf

msan · 06-20-2019, 04:52 PM

You could find a place to turn (basically grinding down the rotors) the rotors. But not sure the cost benefit is there vs buying new rotors . You’d need to remove the rotors to put them on the machine

msan · 06-20-2019, 05:10 PM

Or buy hawk blue pads and drive around for a day or two and it will take some depth off your rotors

SanFranciscoM3 · 06-20-2019, 05:30 PM

Great. So is the recommendation to buy some track brake pads (e.g. hawk blue), have them installed, drive around for a bit, and then go back to the original partly worn OEM pads? Or install new OEM pads after getting the deposits off with track brake pads. I've read some of the threads but that part was not clear.

derbo · 06-20-2019, 05:57 PM

Essex has a good way to cut the rotors for swapping pads. This should be applicable to this as well.

SanFranciscoM3 · 06-20-2019, 10:02 PM

Where is the best place to buy the hawk blue pads?

SanFranciscoM3 · 06-20-2019, 10:09 PM

Also, i’m still not clear on whether the partly used oem street pads can be replaced or if you need to get new pads after removing deposits with hawk blue.

Richbot · 06-21-2019, 11:21 AM

One other thing that has sometimes worked for me - get the rotors relatively warm, then spray BOTH SIDES (meaning you’ll need to get down on your back on the ground with the hose to make sure you wet both sides of eh rotor with water) and let them rust up over a day or so

Then do light bed procedure multiple 60-20 slowdowns in a row 7-8 of them

06-20-2019, 04:40 PM	#1
SanFranciscoM3 Private 9 Rep 62 Posts Drives: e92 M3 Join Date: May 2012 Location: San Francisco iTrader: (0)	Brake Deposits Haven't Gone Away I've read the posts on brake deposits vs rotor warpage. If my shudder under breaking hasn't resolved after 25 days of driving (maybe 1000 miles total, usually road trips) over 1 year, does it definitely mean that my rotors are warped and need to be replaced? My shop initially said it was rotor deposits but now are saying its warped rotors because it hasn't gone away. I've read about getting race pads to clean off deposits but that seems like kind of a PITA vs using an aggressive technique to get the deposits off with OEM pads. FYI 2008 E92 M3, garage queen, 30,000 miles.
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06-20-2019, 04:51 PM	#2
derbo Derbo Tuning 3606 Rep 3,020 Posts Drives: BMW M3 Join Date: Aug 2017 Location: Bay Area, CA iTrader: (2)	I would suggest trying the bedding in with race pads solution first. https://www.apcautotech.com/getmedia...c-8-2018_1.pdf __________________ IG:ruhrohz_m3 Journal: Link E9x ZCP Suspension Info: Link Track Chat Discord: https://discord.gg/VsKbTyqBVj SF Bay Area: DM For coding services
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06-20-2019, 04:52 PM	#3
msan Major 403 Rep 1,171 Posts Drives: 2011 E90 M3 / 2012 X5 35i M Sp Join Date: May 2015 Location: Los Angeles, CA iTrader: (16)	You could find a place to turn (basically grinding down the rotors) the rotors. But not sure the cost benefit is there vs buying new rotors . You’d need to remove the rotors to put them on the machine
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06-20-2019, 05:10 PM	#4
msan Major 403 Rep 1,171 Posts Drives: 2011 E90 M3 / 2012 X5 35i M Sp Join Date: May 2015 Location: Los Angeles, CA iTrader: (16)	Or buy hawk blue pads and drive around for a day or two and it will take some depth off your rotors
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06-20-2019, 05:30 PM	#5
SanFranciscoM3 Private 9 Rep 62 Posts Drives: e92 M3 Join Date: May 2012 Location: San Francisco iTrader: (0)	Great. So is the recommendation to buy some track brake pads (e.g. hawk blue), have them installed, drive around for a bit, and then go back to the original partly worn OEM pads? Or install new OEM pads after getting the deposits off with track brake pads. I've read some of the threads but that part was not clear.
	Appreciate 0 Quote

06-20-2019, 05:57 PM	#6
derbo Derbo Tuning 3606 Rep 3,020 Posts Drives: BMW M3 Join Date: Aug 2017 Location: Bay Area, CA iTrader: (2)	Essex has a good way to cut the rotors for swapping pads. This should be applicable to this as well. __________________ IG:ruhrohz_m3 Journal: Link E9x ZCP Suspension Info: Link Track Chat Discord: https://discord.gg/VsKbTyqBVj SF Bay Area: DM For coding services
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06-20-2019, 10:02 PM	#7
SanFranciscoM3 Private 9 Rep 62 Posts Drives: e92 M3 Join Date: May 2012 Location: San Francisco iTrader: (0)	Where is the best place to buy the hawk blue pads?
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06-20-2019, 10:09 PM	#8
SanFranciscoM3 Private 9 Rep 62 Posts Drives: e92 M3 Join Date: May 2012 Location: San Francisco iTrader: (0)	Also, i’m still not clear on whether the partly used oem street pads can be replaced or if you need to get new pads after removing deposits with hawk blue.
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06-21-2019, 11:21 AM	#9
Richbot Major General 2759 Rep 5,484 Posts Drives: Jerez Black E90 Join Date: Sep 2007 Location: STL iTrader: (5)	One other thing that has sometimes worked for me - get the rotors relatively warm, then spray BOTH SIDES (meaning you’ll need to get down on your back on the ground with the hose to make sure you wet both sides of eh rotor with water) and let them rust up over a day or so Then do light bed procedure multiple 60-20 slowdowns in a row 7-8 of them
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