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post #1 of 10 (permalink) Old 01-15-2017, 01:22 PM Thread Starter
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I have what I hope is a simple question: since I'm getting a tiny bit of steering wheel shimmy when braking, I wonder if the front rotors on my '95 S500 can be turned, assuming it has not been done before (I think they have not). Thanks.
James
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post #2 of 10 (permalink) Old 01-15-2017, 02:21 PM
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I'll say this: MB Rotors are thin and they tend to warp, so it is usually a dealer replace item for me. The best way to check is to take a clean up cut across the caliper and then measure the rotor thickness. When you do measure the caliper, you need a spindle mounted dial indicator to verify what I said. They warp.

I'm sure the knowledgeable DIY expert members will chime in and we will both know for sure


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post #3 of 10 (permalink) Old 01-15-2017, 10:33 PM
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New Rotors

Some additional info would be helpful.
Mileage of the vehicle? Overall condition? Do you intend to keep the vehicle? What are the driving conditions and what is the intended use of the vehicle?
How are the shocks? Steering damper? Tie rod ends? All of the bushings?

One of the true joys of owning these vehicles is the "like new" ride you can achieve with a minimum of maintenance and replacement of critical parts.
If this were a Ford, Dodge, or even a Toyota, and you were only driving it around town for minimum distances and low speeds... sure, have the rotors turned. If you truly are on a very tight budget, do what you feel is the best value.

My take is that for the money for new rotors and pads just bite the bullet and use all new parts of good quality. MY cars are "keepers" so any repairs I make are strides toward making the vehicles "show quality" and considered investments.


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post #4 of 10 (permalink) Old 01-16-2017, 06:10 AM
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If there was an irregularity in the rotors you'd feel a pulsating in the brake pedal.
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post #5 of 10 (permalink) Old 01-20-2017, 05:41 AM Thread Starter
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Good advice, gents. I'll have the brakes fixed at my usual MB indie shop next week, as I like the car (92K) and intend to keep it.
On another note, my daughter's '96 E320 (94K) has a really bad steering wheel shimmy and pedal pulsation when braking, so I guess I'll be paying for that one, too. The info I get from almost everyone is that MB rotors are too thin to turn, and that attempts to do that are almost never successful. So, it's bite the bullet time.
Thanks again,
James
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post #6 of 10 (permalink) Old 01-20-2017, 06:01 AM
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Tell us what your indy shop might suggest or advice that you should do....not a part you want to pinch money as the effect might not make you very happy
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post #7 of 10 (permalink) Old 01-20-2017, 08:49 AM
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James, here is my take on rotors. I NEVER turn them. I have owned 5 different MBs and change out brake pads only. At about 150K the rotors are getting too thin. That is when I change them. My indie feels the same. Just because the rotor wears WHERE the pads hit, doesn't mean the rotor needs turning. Of course, the thickness will be different. We believe "rotor turning" is a gimmick to get more money out of the job.
Now having said all of that, if the rotor has warped for some strange reason, then yes one may have to turn the rotors. But in my many years of cars, I've only had to turn the rotors once. And that was becasue the PO had left the pads on too long and badly scored the rotors.
Anziani
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post #8 of 10 (permalink) Old 01-20-2017, 10:04 AM Thread Starter
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Codger, you misunderstood what I wrote. I was not looking to penny-pinch on brake work; I don't have to do that. I simply wanted to know if turning rotors was acceptable practice for my car. Following their advice, I'm replacing the rotors (and whatever else might be necessary) next week.
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post #9 of 10 (permalink) Old 01-20-2017, 11:50 AM
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Mercedes rotors are made by the same suppliers that make other manufacturer rotors. You can turn them if you wish. The idea that you can't turn Mercedes rotors seems to come from the fact that a) many new Mercedes owners have plenty of money, and b) Mercedes dealers like getting as much of that money as they can.

Rotors don't actually warp, or at least it's extremely rare as it would take an incredible amount of heat. They get hot spots that make it feel like they're warped. A hot spot is an uneven build up of brake pad material that causes the pad to stick more in some places than in others. You can remove hot spots by turning the rotor or by just sanding them with garnet sandpaper, very rigorously, i.e. hard work. It has to be garnet sandpaper which is not sold everywhere.

The net of this is that it just doesn't make much sense to turn rotors. The new rotors don't cost that much, they're thicker than a turned rotor, and you can break them in properly. Improper break in is one of the causes of hot spots.
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post #10 of 10 (permalink) Old 01-20-2017, 03:02 PM
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Quote:
Originally Posted by james sharp View Post
Codger, you misunderstood what I wrote. I was not looking to penny-pinch on brake work; I don't have to do that. I simply wanted to know if turning rotors was acceptable practice for my car. Following their advice, I'm replacing the rotors (and whatever else might be necessary) next week.
James

Your OP, which you hope was a simple question is a double entendre. A double entendre is a figure of speech or a way of wording that is devised to be understood in either of two ways, having a double meaning. Typically, one of the meanings is obvious, given the context whereas the other may require more thought. (edited Wiki excerpt)
I misinterpreted. Iíll just say that it looks like youíve covered all the bases and is making the right decision. Read @LogicalPosition ís post above. I concur with it completely. I have nothing more to add at this time.

Update us once you had it done. Cheers


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