Exploding Disc Rotor??? - BMW Luxury Touring Community
 
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post #1 of 20 Old Oct 18th, 2012, 2:20 pm Thread Starter
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Exploding Disc Rotor???

Got into it with the local Mercedes dealer about Honey Bunny's car.

They tell her that the rotors need to be replaced and if they aren't they could explode.

So I talk to the service guy and ask him what are the measurements on the rotors and how far out of spec are they? First he says he doesn't know. So I say - you're telling me you want me to change out all the rotors but you can't tell me what condition they're in? He asks me to hold for a minute then he comes back and tell me the front rotors are out of spec my .1mm & .2mm, the rear are out by .6mm and .4mm. So I tell him to skip the brake work for now.

I've never, ever heard of a disc rotor exploding. Can anyone give me some feedback on this?

Thanks.

Greg


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post #2 of 20 Old Oct 18th, 2012, 2:50 pm
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Re: Exploding Disc Rotor???

Quote:
Originally Posted by Gruivis
Got into it with the local Mercedes dealer about Honey Bunny's car.

They tell her that the rotors need to be replaced and if they aren't they could explode.

So I talk to the service guy and ask him what are the measurements on the rotors and how far out of spec are they? First he says he doesn't know. So I say - you're telling me you want me to change out all the rotors but you can't tell me what condition they're in? He asks me to hold for a minute then he comes back and tell me the front rotors are out of spec my .1mm & .2mm, the rear are out by .6mm and .4mm. So I tell him to skip the brake work for now.

I've never, ever heard of a disc rotor exploding. Can anyone give me some feedback on this?

Thanks.

Greg
Hey, Greg - folks on Google already grabbed your post and it's the first thing I came to when I searched for Merc exploding disc rotors. Haven't found anyone to agree with your dealership's svc manager. Good luck.
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post #3 of 20 Old Oct 18th, 2012, 2:57 pm
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Re: Exploding Disc Rotor???

Pretty sure he was planning to explode your wallet.

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post #4 of 20 Old Oct 18th, 2012, 4:25 pm
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Re: Exploding Disc Rotor???

Just stay off the autobahn and you'll be OK

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post #5 of 20 Old Oct 18th, 2012, 4:25 pm
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Re: Exploding Disc Rotor???

I've always thought the danger with thin rotors was that the pistons in the calipers could exceed their limits and get past the seals, allowing a pressure failure. However I suppose it's possible that too thin a rotor could cause it to fracture under high stress such as an ABS assisted stop. Never seen either one occur though, and I've been working on cars, trucks, and motorcycles a long time.


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post #6 of 20 Old Oct 18th, 2012, 6:17 pm
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Re: Exploding Disc Rotor???

Happens all the time.......on NASCAR, when a car hits the wall at 180 mph.
Is your wife a Lead Foot?

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post #7 of 20 Old Oct 18th, 2012, 6:21 pm
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Re: Exploding Disc Rotor???

I have seen a rotor worn thru on a rally car, but not exploded.

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post #8 of 20 Old Oct 18th, 2012, 11:58 pm Thread Starter
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Re: Exploding Disc Rotor???

Just what I thought - total dealer bs. There are other highly rated German repair shops nearby. So that's where I'll be going from now on.


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post #9 of 20 Old Oct 19th, 2012, 6:53 am
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Re: Exploding Disc Rotor???

Find yourself a good indie. I have a 2006 e320 diesel in which I had the rotors replaced at 72k miles. This was when the second set of brake pads needed changing. The rotors were starting to get deep grooves in them. I changed the with the Balo rotors and Akebono pads (no brake dust with these). Below are a couple of Mercedes forums which you will find plenty of information:

http://mbworld.org/forums/

http://www.benzworld.org/forums/

Mike Trevelino
Williamsburg, VA
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2000 LT - Totaled at 99,960 miles


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post #10 of 20 Old Oct 19th, 2012, 9:53 am
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Re: Exploding Disc Rotor???

I have never heard of an exploding rotor either. My sister in law had a Ford Focus and my brother in law claimed the caliper bolts were stripped out so he couldn't change the brake pads. I told them I would look at it for them. By the time they got the car to me the brake pads were way past being metal to metal. This car had vented rotors and the metal backing plate that usually has the brake pad attached to it, had been grinding the rotor apart. The rotor was so bad that half of the rotor was gone. It was grinding into the vents of the rotor. It was blue from the heat. Nice huh. Some people just don't care about their safety. It turned out that the caliper bolts were not stripped out after all. They just happened to be an odd ball size. I needed a 7mm hex key wrench to remove the bolts. Most hex key sets do not have this size. Luckily I had one. I put new rotors and pads on and all was good.
I think if a rotor was ever going to explode, that one could have.

John

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post #11 of 20 Old Oct 19th, 2012, 10:41 am
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Re: Exploding Disc Rotor???

That's a new one on me...I suppose the $11,000 carbon/ceramic ones might be able to explode if you were to run them at 10/10ths on the track for two hours and then spray them with icewater...

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post #12 of 20 Old Oct 19th, 2012, 10:58 am
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Re: Exploding Disc Rotor???

Quote:
Originally Posted by petevandyke
That's a new one on me...I suppose the $11,000 carbon/ceramic ones might be able to explode if you were to run them at 10/10ths on the track for two hours and then spray them with icewater...
Or do this!!
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post #13 of 20 Old Oct 19th, 2012, 12:34 pm
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Re: Exploding Disc Rotor???

That might be a wee bit too much "bedding in".


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post #14 of 20 Old Oct 19th, 2012, 3:36 pm
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Re: Exploding Disc Rotor???

How bout a nice letter to MBUSA and CC the owner and GM of the dealership. I threw one together for you just because I'm bored and I HATE when service reps try to scare people.


Dear Mercedes-Benz,

Today I was in [dealer name here] for service on my car. I cannot express the fear I felt when the service rep, [service rep name here], told me that my brake rotors could explode if I did not replace them! I have always thought that Mercedes-Benz was a highly engineered car, but I'm very shaken by what I was told. I don't understand how brakes work, but it seems obvious to me that if my brake rotors exploded, my wife (it's her car) could be seriously injured or killed. As you might imagine, I take this issue very seriously.

I have to assume that [service rep name here] had gotten his information about my potentially exploding brake rotors from a Mercedes-Benz trained and certified mechanic. If what [service rep's name here] told me is true then I will not be in the market for another Mercedes-Benz in the future as my wife's safety is worth much more to me than any car. If what [service rep's name here] told me is not true, then I expect that Mercedes-Benz dealer management should know that seriously irresponsible information and scare-tactics are used at [dealership's name here] and [dealership's name here] is representing Mercedez-Benz products in a highly unfavorable and suspicious light.

I look forward to a response containing a description of the action that you plan to take to resolve this upsetting matter.

Thank you

[your name here]

Last edited by cwarren; Oct 19th, 2012 at 3:39 pm. Reason: Changed greater-than's to brackets
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post #15 of 20 Old Oct 21st, 2012, 5:55 am
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Re: Exploding Disc Rotor???

That is just plain BS. They rarely ever develop harmless hairline cracks, but explode?? He either is really stupid, or thinks you are...

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post #16 of 20 Old Oct 21st, 2012, 7:18 am
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Re: Exploding Disc Rotor???

I'll bet he also told your wife that her muffler bearings need changing and that the red brake light fluid was dangerously low!

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post #17 of 20 Old Oct 21st, 2012, 7:22 am
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Re: Exploding Disc Rotor???

Greg - I would be in favor of communicating with the dealer Principal in your situation. If the dealership is RBM North, contact Casey Farmer (she is the daughter of John Ellis, who also has the Sandy Springs shop). She needs to know.
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post #18 of 20 Old Oct 25th, 2012, 8:23 pm
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Re: Exploding Disc Rotor???

I've seen drums explode but discs, never.

B D R
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post #19 of 20 Old Oct 25th, 2012, 10:56 pm Thread Starter
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Re: Exploding Disc Rotor???

Dick, pm me the contact info and I will definitely let her know.

It's too late to save me as a customer but the owner should be told what's going on.

Frankly I'm very disappointed in the amount of maintenance this 05 E320 has required. Bought this thing new and since then I've had to replace the passenger seat, transmission mounts, engine mounts, rear view mirror, driver door handle, driver window motor, keyless door lock button and a whole host of other stuff I can't even remember right now. Fortunately GEICO mechanical breakdown insurance was there to take the edge off the fracking, but just the sheer number of component failures was unexpected.

Warren, thanks for the letter. Got a nice laugh on that.

Greg


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post #20 of 20 Old Nov 10th, 2012, 7:56 pm
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Re: Exploding Disc Rotor???

WOW it must be getting pretty bad if a merc dealer has to resort to (insert national muffler shop chain here) tactics to pad their bottom line. Just call it what it is; fraud. On a side note I have seen the rear disc of a lincoln continental worn down to the thickness of a playing card and remain (somewhat) functional as well as a dodge caravan whose owner (and I'm not going to mention her sex) drove it through the friction pad, through the backing plate, through the caliper pistons until it wore the vented disc through and broke the caliper off the mounting bracket. Vehicle was brought in because " the wheel wobbles". To think we ride motorcycles on the same streets as these people.
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