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      07-07-2020, 06:19 PM   #1
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2013 M6 brake wear

New to me 2013 F12 with 31k miles, recent inspection shows lip on rear rotors but fronts are fine. Pads low all around. I'm used to fronts wearing much faster than rears, but this seems pretty consistent or maybe even rear biased wear. Is this typical?

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      07-07-2020, 07:02 PM   #2
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Just had brakes done at about 30,000 miles-yeah, rear rotors replaced and pads all around.
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      07-07-2020, 11:56 PM   #3
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At 31k, there's a chance the rears were never replaced since new.
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      07-08-2020, 05:45 AM   #4
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Doesnt mdm and traction control apply the rear brakes more to correct itself. That might be a factor?
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      07-08-2020, 12:31 PM   #5
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Quote:
Originally Posted by RagtagXMASTER View Post
Doesnt mdm and traction control apply the rear brakes more to correct itself. That might be a factor?
I don't believe MDM or TCS make adjustments through allowable power transfer to each rear wheel.

Put it this way. When TCS is on, and you stomp on the gas from a stop, you got a ton of wheelspin, but the car doesn't go anywhere. It's not the brakes that's not causing you not to move, it's the inability for the differential to apply the power correctly.
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Last edited by Flying Ace; 07-08-2020 at 05:15 PM..
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      07-08-2020, 01:23 PM   #6
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Quote:
Originally Posted by Flying Ace View Post
I don't believe MDM or TCS make adjustments through. It makes adjustments through allowable power transfer to each rear wheel.

Put it this way. When TCS is on, and you stomp on the gas from a stop, you got a ton of wheelspin, but the car doesn't go anywhere. It's not the brakes that's not causing you not to move, it's the inability for the differential to apply the power correctly.
I think he is trying to say that TCS might be applying the brake to the wheel with the least traction to shift torque to the opposite wheel. (sometimes called electronic limited slip diff?) But regardless, that is not my understanding of how TCS works on these cars.
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      07-08-2020, 05:16 PM   #7
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Quote:
Originally Posted by patchesj View Post
I think he is trying to say that TCS might be applying the brake to the wheel with the least traction to shift torque to the opposite wheel. (sometimes called electronic limited slip diff?) But regardless, that is not my understanding of how TCS works on these cars.
Yes correct That's what exactly what I'm saying. The BMW MDM does not apply brakes. It's simply distributes power
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      07-08-2020, 06:25 PM   #8
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thanks for the clarification, i did not know how the M6 applied it. i know in some volkwagen platforms they just apply the brakes to the side that is slipping to pull it in.
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      07-08-2020, 06:32 PM   #9
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Quote:
Originally Posted by RagtagXMASTER View Post
thanks for the clarification, i did not know how the M6 applied it. i know in some volkwagen platforms they just apply the brakes to the side that is slipping to pull it in.
This is a M car bruh, not your Sunday church picnic VW
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      07-08-2020, 08:38 PM   #10
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Quote:
Originally Posted by Flying Ace View Post
Quote:
Originally Posted by RagtagXMASTER View Post
thanks for the clarification, i did not know how the M6 applied it. i know in some volkwagen platforms they just apply the brakes to the side that is slipping to pull it in.
This is a M car bruh, not your Sunday church picnic VW
you right.
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      07-09-2020, 06:57 PM   #11
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Sorry to slightly hijack, but does anyone remember off hand how many millimeters brakes need to be before BMW will replace them under maintenance? Car is telling me 1400 more miles on my rears, but at this rate I think my maintenance will be expired by the time I get 1400 in. Thanks
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      07-14-2020, 09:52 AM   #12
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Quote:
Originally Posted by RagtagXMASTER View Post
Doesnt mdm and traction control apply the rear brakes more to correct itself. That might be a factor?
Traction control applies brake force to keep the car from sliding.

Take a hard curve with traction control left ON; you can feel the car applying brakes momentarily to keep the car in control. You can feel this especially during coasting on the curve.

Turn the traction control OFF but leave the MDM on, and take the same curve. You won't feel the braking anymore. Coasting around the curve will be smooth with no felt braking.

Turn MDM OFF, and you're on your own.
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      07-15-2020, 06:15 PM   #13
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Quote:
Originally Posted by m34josh View Post
Sorry to slightly hijack, but does anyone remember off hand how many millimeters brakes need to be before BMW will replace them under maintenance? Car is telling me 1400 more miles on my rears, but at this rate I think my maintenance will be expired by the time I get 1400 in. Thanks
For Rotors it's imprinted onto the rotor hats.

The 1400 estimate is based a pad wear sensor on a single corner. Face on my experience the sensors are reasonably accurate. I typically run it down to zero or even a few hundred pass the indicator.
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      07-16-2020, 04:40 PM   #14
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Quote:
Originally Posted by Flying Ace View Post
For Rotors it's imprinted onto the rotor hats.

The 1400 estimate is based a pad wear sensor on a single corner. Face on my experience the sensors are reasonably accurate. I typically run it down to zero or even a few hundred pass the indicator.
The sensors don't measure approx pad thickness to the computer, the sensors are there for when you do get low the rotor rubs the sensor away and breaks the circuit and thats what gives you the check brake light on your dash ,at that point sensors and pads must be replaced,
If you were to install brand new pads and kept the worn sensor you will still have a check brake light on the dash
I believe that 1400 or what ever number is an approx installed by the BMW tech after he measures the thickness of the pad
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      07-16-2020, 08:21 PM   #15
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Quote:
Originally Posted by Whipple View Post
The sensors don't measure approx pad thickness to the computer, the sensors are there for when you do get low the rotor rubs the sensor away and breaks the circuit and thats what gives you the check brake light on your dash ,at that point sensors and pads must be replaced,
If you were to install brand new pads and kept the worn sensor you will still have a check brake light on the dash
I believe that 1400 or what ever number is an approx installed by the BMW tech after he measures the thickness of the pad
So sensor is a rotor measure?
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