G Class (W465/W463A) W463 Produced 2019-2024: G550, G63 AMG W465 Produced 2025-

2021 G-63 Warped Front Rotor

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Old Nov 10, 2023 | 11:43 AM
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2021 G-63 Night Black Magno
2021 G-63 Warped Front Rotor

I took the G-63 to dealer for B service at 20,000 miles, they also completed the wiring harness recall. The first time I drove it on the highway at 70 miles an hour I noticed a shimmer in the brakes. I called the dealership back, explained what was going on. They told me it was probably a brake rotor that was bad. I explained to them I did not have this problem before I took it to the dealership. I took it back in to dealer and upon investigation they said the front rotor was warped and no warranty coverage!

I argued with them that I did not have this problem before bringing in for B service, and they eventually agreed to replace the front brake pads and rotors and NOT charge me labor. They said I would have to contact Mercedes corporate about possible reimbursement for parts (front rotors, and pads) which are $2,281.95 plus tax.

I called Mercedes corporate customer service to explain the situation, was basically told the brakes and rotors are not covered due to personal driving habits, etc. etc. but she would reach out to the dealership and get back with me.

Any thoughts or similar situations out there?

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Old Nov 10, 2023 | 08:37 PM
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Originally Posted by TNMICH
I took the G-63 to dealer for B service at 20,000 miles, they also completed the wiring harness recall. The first time I drove it on the highway at 70 miles an hour I noticed a shimmer in the brakes. I called the dealership back, explained what was going on. They told me it was probably a brake rotor that was bad. I explained to them I did not have this problem before I took it to the dealership. I took it back in to dealer and upon investigation they said the front rotor was warped and no warranty coverage!

I argued with them that I did not have this problem before bringing in for B service, and they eventually agreed to replace the front brake pads and rotors and NOT charge me labor. They said I would have to contact Mercedes corporate about possible reimbursement for parts (front rotors, and pads) which are $2,281.95 plus tax.

I called Mercedes corporate customer service to explain the situation, was basically told the brakes and rotors are not covered due to personal driving habits, etc. etc. but she would reach out to the dealership and get back with me.

Any thoughts or similar situations out there?
the tech probably banged up your rotors during the tire/wheel rotation
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Old Nov 11, 2023 | 01:05 PM
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B service includes brake fluid flush. Are you certain the problem is a warped rotor and not a problem with the brake fluid servicing? If it is the rotor, slight warp can be machined for much less than $2300. You shouldn't need new pads and rotors at 20K miles. I'm at 20K and mine are still fine.

Last edited by streborx; Nov 11, 2023 at 01:10 PM.
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Old Nov 11, 2023 | 02:02 PM
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Thanks for your input. I only know what the dealer told me upon reinspection that rotor was warped. Yes, they did replace the brake fluid at B service interval. It was also noted by dealer on my B service invoice that they, "Remove Wheels and Perform Complete Brake Inspection". Per dealer, I have life left on the pads Front 8mm and Rears 7mm. Something was done to my truck at the service causing the rotor problem as I had no issues before the B service. I definitely agree I should not need new pads and rotors at 20,000 miles. At least not at my expense. Are you suggesting I take it to an Indy shop and have the rotor machined?
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Old Nov 11, 2023 | 02:23 PM
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Originally Posted by haa
the tech probably banged up your rotors during the tire/wheel rotation
That doesn't cause rotor warping. Excessive heating of the rotors is usually the culprit.
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Old Nov 11, 2023 | 03:20 PM
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Originally Posted by TNMICH
Thanks for your input. I only know what the dealer told me upon reinspection that rotor was warped. Yes, they did replace the brake fluid at B service interval. It was also noted by dealer on my B service invoice that they, "Remove Wheels and Perform Complete Brake Inspection". Per dealer, I have life left on the pads Front 8mm and Rears 7mm. Something was done to my truck at the service causing the rotor problem as I had no issues before the B service. I definitely agree I should not need new pads and rotors at 20,000 miles. At least not at my expense. Are you suggesting I take it to an Indy shop and have the rotor machined?
Seems odd to me that "complete brake inspection" overlooked a warped rotor (I'm sure if you had been experiencing pre-service shimmy, that you would have asked for that to be investigated). I just did my B service, and pads (F & R) are all at just under 10mm, so your pad wear doesn't seem excessive. A second opinion never hurts -- if there's a brake shop nearby (Brakes Plus, etc.) ask them to inspect the rotor, and if it's warped if it can be resurfaced. Machining a rotor usually costs less than $50 and takes less than 30 minutes. Unless your front rotors are also scored, your pads are probably OK and can continue to be used with a resurfaced rotor.
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Old Nov 11, 2023 | 03:52 PM
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I guess Complete Brake Inspection at Mercedes Benz of Nashville doesn’t mean much. They sent me home with warped rotor.

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Old Nov 12, 2023 | 01:21 PM
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Thanks for sharing your B-service invoice. I just completed my B-service, and inasmuch as I'm about 6 hours away from the nearest MB dealer, I do these services myself.

In addition to what your dealer did, I did the following:
- replaced both engine air intake filters (I remove and clean them every 5K miles when I do oil changes).
- balanced and rotated the tires (free at Discount Tire every 5K miles with the tires I purchased there)
- inspected front and rear wipers (surprised your dealer didn't do this -- it's a big profit item for them)
- ran battery test using a Foxwell BT705 analyzer

BTW, do you know if the Mobil-1 engine oil they used was the standard Euro formulation, or the ESP variety? I'm guessing it was the Euro 0W-40, given that the ESP version retails for about $11.50/quart at Autozone and is mostly targeted at diesel powered MBs.

The service report indicates they did a short 4 mile test drive to preform a "rotor sensor adaptation test", after completing the recall 2023070022 ECU update. Interesting that no rotor shimmy was noted during this test drive. But if the shimmy is only noticeable at 70 mph as your initial post indicated, perhaps the warp is very slight and only occurs when the rotor velocity induces some resonance into the system.

IMO, a complete brake inspection includes in addition to measuring pad thickness, measuring the rotor thickness and subjectively evaluating the condition of the rotors with respect to surface integrity. Measuring warp isn't that difficult to do, but probably would not be done unless the owner reported brake shimmy.
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Old Nov 13, 2023 | 06:28 PM
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Originally Posted by TNMICH
I guess Complete Brake Inspection at Mercedes Benz of Nashville doesn’t mean much. They sent me home with warped rotor.
Did they put miles on it? I took my G 63 in for the last recall and they put more than 30 miles on it. I asked them about it and the service manager and tech drove it. I had stuff in the cargo section that was tossed around because they were screwing around beating on it, driving hard.
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Old Nov 13, 2023 | 11:40 PM
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They drove it 4 miles. Also, I heard back from Mercedes Corporate customer service, and they are willing to pay for 50% of the parts as a good will adjustment.
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Old Nov 14, 2023 | 04:53 AM
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Originally Posted by TNMICH
They drove it 4 miles. Also, I heard back from Mercedes Corporate customer service, and they are willing to pay for 50% of the parts as a good will adjustment.
I’m surprised, that’s better than nothing.
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