Question about strange brake rotor wear

Walt White Coupe · 06-01-2019, 12:27 PM

2013 650 ix with 30,000 miles.

Over the last 2000 miles I've noticed that the left front brake pad is not making full contact with the rotor at the outer edge. The brake pads still have a lot of life left based on current thickness and the wear on the rotors themselves is relatively minor with a very small lip at the outer circumference.

Tried some hard stops to see if that would make the pad fully contact the rotor but no change. Planning on trying some really hard stops next but wondered if anyone has seen something like this before. Thanks in advance.

Left Front Rotor:

Right Front Rotor:

Opie55 · 06-01-2019, 01:23 PM

I don't that it's that it is not making contact, but that only the outer part has become glazed for some reason. You can see in your photos how brake material is basically fused to the rotor. I'd take some 200 sandpaper on a flat wood block and sand that off. You can sort of try to sand in a circle, but don't worry much because the scratches will be worn away soon. Or go over it with 400 to reduce the scratches. But also inspect your pads in that location. You might also pass paper of those lightly

Opie55 · 06-01-2019, 01:24 PM

Dupe.

Walt White Coupe · 06-03-2019, 03:20 PM

I went through a typical brake "bedding" procedure that included around 8 hard slowdowns from 60 mph and I started to get some contact at that outer 1/4 inch edge with the brake pad. Hopefully with little more miles and brake pad wear, I'll get full contact on the rotor again. Still wondering why this is happening.

ezmaass · 06-03-2019, 06:13 PM

Did you inspect the brake pad to see if there was anything unusual?

ezmaass · 06-03-2019, 06:14 PM

On a separate note altogether, the 6's brakes are far less impressive than every other BMW I've owned. They really could use an upgrade. For such a big, heavy car, they're just not as powerful as I'd like.

Walt White Coupe · 06-03-2019, 08:53 PM

Quote:

Originally Posted by ezmaass

Did you inspect the brake pad to see if there was anything unusual?

So I just noticed this problem and don't want to take it apart if I don't have to.

Walt White Coupe · 06-05-2019, 07:05 PM

So I've only put around 100 miles and very light braking but I'm seeing contact on that outer 1/4 inch of rotor. Looks to me, like I said before, that with a few more miles it's going to correct itself. Still not sure what is going on.

06-01-2019, 12:27 PM	#1
Walt White Coupe Captain 223 Rep 738 Posts Drives: 2013 650ix Coupe, 23 C8 Vette Join Date: Mar 2011 Location: Phila, PA iTrader: (0)	Question about strange brake rotor wear 2013 650 ix with 30,000 miles. Over the last 2000 miles I've noticed that the left front brake pad is not making full contact with the rotor at the outer edge. The brake pads still have a lot of life left based on current thickness and the wear on the rotors themselves is relatively minor with a very small lip at the outer circumference. Tried some hard stops to see if that would make the pad fully contact the rotor but no change. Planning on trying some really hard stops next but wondered if anyone has seen something like this before. Thanks in advance. Left Front Rotor: Right Front Rotor: Last edited by Walt White Coupe; 06-01-2019 at 12:42 PM..
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06-01-2019, 01:23 PM	#2
Opie55 Colonel 1202 Rep 2,911 Posts Drives: '15 650i Convertible Join Date: Apr 2018 Location: US iTrader: (0)	I don't that it's that it is not making contact, but that only the outer part has become glazed for some reason. You can see in your photos how brake material is basically fused to the rotor. I'd take some 200 sandpaper on a flat wood block and sand that off. You can sort of try to sand in a circle, but don't worry much because the scratches will be worn away soon. Or go over it with 400 to reduce the scratches. But also inspect your pads in that location. You might also pass paper of those lightly
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06-01-2019, 01:24 PM	#3
Opie55 Colonel 1202 Rep 2,911 Posts Drives: '15 650i Convertible Join Date: Apr 2018 Location: US iTrader: (0)	Dupe. Last edited by Opie55; 06-01-2019 at 02:05 PM..
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06-03-2019, 03:20 PM	#4
Walt White Coupe Captain 223 Rep 738 Posts Drives: 2013 650ix Coupe, 23 C8 Vette Join Date: Mar 2011 Location: Phila, PA iTrader: (0)	I went through a typical brake "bedding" procedure that included around 8 hard slowdowns from 60 mph and I started to get some contact at that outer 1/4 inch edge with the brake pad. Hopefully with little more miles and brake pad wear, I'll get full contact on the rotor again. Still wondering why this is happening.
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06-03-2019, 06:13 PM	#5
ezmaass Lieutenant Colonel 373 Rep 1,698 Posts Drives: '17 650xi GC / '15 Audi R8 V10 Join Date: Oct 2008 Location: CT iTrader: (0)	Did you inspect the brake pad to see if there was anything unusual? __________________ 2017 BMW 650xi Gran Coupe \| MSport \| Exec Package \| Driver Assist Plus \| ACC Stop & Go \| Adaptive Drive \| B&O \| Night Vision \| Cold Weather \| Active Seats 2015 Audi R8 V10 \| Brilliant Red on Black \| S-Tronic \| Carbon Sideblades \| Carbon Trim \| Full Leather \| Sport Exhaust \| Illuminated Doorsills \| I-Pod \| Contrast Stitching Previous: '14 550xi, '07 335i, '01 325i
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06-03-2019, 06:14 PM	#6
ezmaass Lieutenant Colonel 373 Rep 1,698 Posts Drives: '17 650xi GC / '15 Audi R8 V10 Join Date: Oct 2008 Location: CT iTrader: (0)	On a separate note altogether, the 6's brakes are far less impressive than every other BMW I've owned. They really could use an upgrade. For such a big, heavy car, they're just not as powerful as I'd like. __________________ 2017 BMW 650xi Gran Coupe \| MSport \| Exec Package \| Driver Assist Plus \| ACC Stop & Go \| Adaptive Drive \| B&O \| Night Vision \| Cold Weather \| Active Seats 2015 Audi R8 V10 \| Brilliant Red on Black \| S-Tronic \| Carbon Sideblades \| Carbon Trim \| Full Leather \| Sport Exhaust \| Illuminated Doorsills \| I-Pod \| Contrast Stitching Previous: '14 550xi, '07 335i, '01 325i
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06-05-2019, 07:05 PM	#8
Walt White Coupe Captain 223 Rep 738 Posts Drives: 2013 650ix Coupe, 23 C8 Vette Join Date: Mar 2011 Location: Phila, PA iTrader: (0)	So I've only put around 100 miles and very light braking but I'm seeing contact on that outer 1/4 inch of rotor. Looks to me, like I said before, that with a few more miles it's going to correct itself. Still not sure what is going on.
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