Burnish them. I drove around and stopped only with P brake about six times from City speeds. I had sanded off the nearly two decades of crust when I replaced the rotors and wanted to seat them to the rotors.

I was able to successfully use them as emergency brake and stop from any speed using only engine braking and the parking brake after but never tried a steep road so now I'm curious.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)