Re: Rotors for an E320 - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 09-30-2016, 03:46 PM Thread Starter
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Re: Rotors for an E320

Hi all.

I got 4 new rotors for my '99 E320 a few months back and they are warped again.

What do you suppose would make this happen in such a short amount of time?

I take monthly trips driving 300 miles straight. Would this generate enough heat to do this with normal stopping?
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post #2 of 9 (permalink) Old 09-30-2016, 04:30 PM
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What brand are they? Brembo?
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post #3 of 9 (permalink) Old 09-30-2016, 07:19 PM
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Dumb questions, maybe.

1. Do you rest your foot lightly on the brake pedal while driving?

2. Are you tracking the car?

3. Do you buy crappy Chinese rotors?

4. Did you replace the pads at the same time?

5. Heat is the only reason rotors warp. Why they're heating is either mechanical (stuck caliper) or operator error. Unlikely that all 4 calipers are a problem.

D

"If you have been in a poker game for a while, and you still donít know who the patsy is, youíre the patsy." Warren Buffet
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post #4 of 9 (permalink) Old 01-06-2017, 03:38 AM Thread Starter
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What brand are they? Brembo?
I'll have to ask because I have to take it in yet again for another one warping.

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post #5 of 9 (permalink) Old 01-06-2017, 03:52 AM Thread Starter
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What brand are they? Brembo?
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Originally Posted by dm_n_stuff View Post
Dumb questions, maybe.

1. Do you rest your foot lightly on the brake pedal while driving?

2. Are you tracking the car?

3. Do you buy crappy Chinese rotors?

4. Did you replace the pads at the same time?

5. Heat is the only reason rotors warp. Why they're heating is either mechanical (stuck caliper) or operator error. Unlikely that all 4 calipers are a problem.

D
1. Never.

2. HA! No.

3. I actually asked the shop and they neither confirmed or denied. Either way, it's on them because I have to go in for the third time to replace them under warranty.

4. Yes, when I replaced them all around last year all pads were replaced as well as calipers.

5. Not operator error for sure. I've had many cars over my almost 40 years of driving and have never encountered something like this, hence, hitting the forums for answers. Hell, my 2008 Acura RDX just hit 108K miles and I just replaced rotors because of a little wear (not warp, just wear). I'm wondering if they are just using cheap rotors? I got the Merc at 22K miles and had to replace the rotors at around 56K. I thought that was a good run for an old gal that sat in a barn for years before I picked her up.

Should I request they be replaced with a specific brand?
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post #6 of 9 (permalink) Old 01-06-2017, 06:10 AM
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Yes, use MB rotors, they really dont cost more than other brands
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post #7 of 9 (permalink) Old 01-06-2017, 05:03 PM
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Please understand that replacing brake calipers - which is the piston/braking system on the wheel - on a W210/E320 is like a very/very rare thing unless salt or corrosion freezes them up. Did some shop tell you you needed new calipers all around for some bull-sh*t reason ?

1) Replacement brake rotors for your E320 are inexpensive. The Mercedes OE rotors are made by ATE and have a grey light coating on the disc from the factory to protect them before they are installed. Under MB brandbox about $60 each x 4 = $240. Under ATE brand - call cheap - like $35/$40 each x 4 = $140/$160 all around. There are other rotors - Bosch etc - in that $30 ea range.

2) Brake pads - Front/rear MB sets made by Pagid in MB boxes - about $90 fronts - and correct rear set (two different types) about $65 = $155 all around.
Pagid brand - exact same pad as factory - about 1/2 MB brand - around $80 front and back.. As many other pads choices as there are owners. If you want less dust - decent semi-metallics about same price as Pagid. On ceramic - I don't recommend in a 180K E320.

So.... parts equivalent MB brand - ATE/Pagid = let's call that $250

Labor at any qualified brake shop - let's call that $150.

Total whole deal at/less than $400...
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post #8 of 9 (permalink) Old 01-06-2017, 05:36 PM
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The only time I've ever warped rotors was in a 1973 Mustang, in 1973.

Drove it REALLY hard, and braked the crap out of it, warped the front rotors badly.

Had a Volvo that ate front rotors. But that was a Volvo issue, not driver error.

Suspect a combination of errors here. But, given that they've warped multiple times, I think I'd run it to another shop and get a 2nd opinion.

Also I'd swap in new pads. Pagid are good OEM pads, so go with them.

I don't know what's stock on an E320, but I'd consider swapping in vented and/or slotted rotors to help dissipate heat. I've had Brembo and Stoptech on a couple cars and both worked well without warping. I had stoptech slotted and drilled rotors on a car I tracked and never had an issue.

D

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post #9 of 9 (permalink) Old 01-07-2017, 11:10 AM
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One more thing you might want to consider:

In what condition are the HUB Interfaces??

If you have Un-Even, Corroded Hub-Faces?? The New rotor is not going to sit completely True to the Driveline.

You might not have truly "Warped" Rotors, but rather "Abnormal Run-Out" Related to the Rotor not being mounted Uniformly Flush.
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