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New disc/ pads- crazy brake dust on rears?

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Old Aug 18, 2019 | 02:05 PM
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2018 c63
New disc/ pads- crazy brake dust on rears?
2018 c63. Just had new disc and pads all round, luckily at Mercedes expense after some discussion. Always got a lot of brake dust but the rears are currently generating ridiculous amounts of dust. Done about 700 miles and even after a wash, then a short journey, the rears are covered. Fronts are fairly clean?





Could the pads be faulty or a fitment issue? Or isn’t this normal? As I said fronts not a problem ?
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Old Aug 18, 2019 | 02:10 PM
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You'd expect the fronts to be dirtier, not the rear. Especially with this car's braking setup.

Parking brake dragging? Running different type of pads in the rear vs. up front?
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Old Aug 18, 2019 | 02:39 PM
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My rear wheels are constantly dirty, but it’s 100% from traction control kicking in.
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Old Aug 18, 2019 | 02:45 PM
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Originally Posted by zibby43
You'd expect the fronts to be dirtier, not the rear. Especially with this car's braking setup.

Parking brake dragging? Running different type of pads in the rear vs. up front?
All Oem discs and pads fitted all round at dealers at same time last week. Fronts no real dust. Rears covered after 1 or 2 journeys?

Could the rear brake be still on somehow?
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Old Aug 18, 2019 | 02:46 PM
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Originally Posted by JWreck
My rear wheels are constantly dirty, but it’s 100% from traction control kicking in.
Only been on gentle runs. No tc been kicking in.
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Old Aug 18, 2019 | 04:27 PM
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Originally Posted by NJ 1161
Only been on gentle runs. No tc been kicking in.
TC kicks in without the light coming on. Most people will wear through their rears faster than the fronts. That’s what happened to me. I put aftermarket pads on and it did cut down on the dust.
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Old Aug 18, 2019 | 04:35 PM
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2018 c63
Originally Posted by OrientBlue3
TC kicks in without the light coming on. Most people will wear through their rears faster than the fronts. That’s what happened to me. I put aftermarket pads on and it did cut down on the dust.
Same car, same driving style and not had dust on rears to this degree prior to change.

Aware aftermarket pads could prevent this but that’s not what I’m asking.
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Old Aug 18, 2019 | 04:49 PM
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Yeah, pretty much as long as you don’t see pads dragging on the rear rotors, sounds like you’re seeing how dusty these pads really are.

After two sets of rear pads in 20k miles, I switched to Porterfield and so far they’re noticeably better.

I’ll always keep the front pads OEM though; don’t want to lose any of that bite or power.
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Old Aug 18, 2019 | 06:18 PM
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Originally Posted by OrientBlue3
TC kicks in without the light coming on. Most people will wear through their rears faster than the fronts. That’s what happened to me. I put aftermarket pads on and it did cut down on the dust.
Which pads?
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Old Aug 27, 2019 | 03:08 PM
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Originally Posted by ///Bruce
Which pads?
I'm get rust on rear disc. Have 3,300 miles on c63s
Advise what to do?
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Old Aug 27, 2019 | 06:19 PM
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Originally Posted by jj18
I'm get rust on rear disc. Have 3,300 miles on c63s
Advise what to do?
Where? On the surface of the rotor? If you're getting rust there, go for a drive and stomp on the brakes a few times. Friction will remove the surface rust. These rotors will rust immediately after a car wash or after being parked out in the rain. Completely normal.
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Old Aug 27, 2019 | 10:36 PM
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Originally Posted by zibby43
Where? On the surface of the rotor? If you're getting rust there, go for a drive and stomp on the brakes a few times. Friction will remove the surface rust. These rotors will rust immediately after a car wash or after being parked out in the rain. Completely normal.

Is the rust normal or how can I remove it. Rear.2019 C63S coupe . Thanks
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Old Aug 27, 2019 | 10:53 PM
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Originally Posted by jj18

Is the rust normal or how can I remove it. Rear.2019 C63S coupe . Thanks
So it's not on the face of the rotor itself. From that photo and angle, it looks like it is on the hat.

There's a sealant made by Wurth called SBS Brake Treatment. Supposedly works wonders on this type of benign surface rust and is safe/fine for the surface of the rotor if some gets on there.

https://www.wurthusa.com/Chemical-Pr...II/p/189311069

Good luck.
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Old Aug 27, 2019 | 11:41 PM
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Originally Posted by zibby43
So it's not on the face of the rotor itself. From that photo and angle, it looks like it is on the hat.

There's a sealant made by Wurth called SBS Brake Treatment. Supposedly works wonders on this type of benign surface rust and is safe/fine for the surface of the rotor if some gets on there.

https://www.wurthusa.com/Chemical-Pr...II/p/189311069

Good luck.
Thanks. I'm look at the site and some YouTube clips.
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Old Aug 28, 2019 | 03:08 AM
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Originally Posted by jj18
Thanks. I'm look at the site and some YouTube clips.
My pleasure! Hope it works as well for you as it has for others.
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