I get a pulsation in the brake pedal at speeds greater than 60 mph. I'm suspecting warped front brake rotors. I have an 07 E63, with the two-piece rotors, not cheap.
I was hoping this wasn't the issue, so I purchased new carbon ceramic pads. I went to my mechanic (Benz Elite Automotive), and he confirmed my suspicion. My rotors look brand new, no ridges and grooves, just a flat surface.
He said when the brake were hot, water got on them, causing them to warped. And also said I can put on the new pads, but my problem will remain. So, I just agreed and opened up my wallet yet again.
The car goes into the shop on Monday for a complete brake replacement, front and rear rotors, pads and wear sensors. I have already order the rear rotors from FCP Euro.

Is there a reason why shops, don't turn rotors anymore? I know that rotors are very cheap nowadays, but not two-piece rotors. I called several shops, and they don't do them. I know that Colman Racing can make a set of friction rings for two piece rotors.
As, I looked into this years ago, for under $800

William,

The following is the cost for the brake rotors.

I also included the options.


17598 Casting, machined to specs……………..$275.79 ea.

Options:

18841…Stress Relieve………………………$ 24.68 ea. rotor

18842…Balance………………………………..$ 29.83 ea. Rotor (Recommended due to diameter of disc)

18843..Crossdrill (Standard Pattern)…….$ 65.50 ea. rotor

18844…Gas Vent (Standard Pattern)…….$ 24.80 ea. rotor


Lead Time: 10 working days



Thank You,

Glenn Myers

Coleman Racing Products

(800) 221-1851 ext 122

glenn@colemanracing.com

 

I bought a set of Girodisc front rotors and had them cryo treated by Frozen Rotors. Have these waiting for install when I need new sneakers in a few months.

I installed a set of two piece Brembo rotors about 3 years ago and am starting to get a little wobble braking at speed. My indy shop owner convinced me that cryo rotors won't wear. We shall see. I will install Porterfield pads with the Girodisc rotors. Hope they won't dust too bad. Have EBC ceramic pads on the car now and the don't dust too much.

If these expensive, cryo'd rotors have issues in 2-3 years of use, I will convert to the much cheaper one piece rotors.

 

With the new brakes, I'd go ahead and do some proper brake bedding procedures. That way, you'll minimize the risk of warping the rotors again. It's a bit tedious to do and by the time you near the end, you'll feel like vomiting, but it's worth it.

 

I have heard claims that if there is no actual cracking or other physical abnormality that "warped rotors" actually means uneven pad deposition. Obviously turning the rotors WOULD fix this. But another wild thing I've heard is that you can take the car up to triple digits and slam on the brakes. Do that a few times and it might just go away. Obviously this is easy and fun and doesn't really have a downside...

 

I agree, also helps if there is no/minimal traffic around as you are doing quite a few stops

 

Huh. Those of us that have been dealing with w202 AMG's since the 90's find this funny. Our front rotors have *always* been $300/ea

 

These are all good suggestions, and I will try it. I think my issue originated from the car wash, and that is the only way, my rotor would have had water sprayed on them while they were hot.
Now to find a stretch of road, to get it up to speed without going to jail.

 

After doing a little more research, I really don't think that uneven pad deposition is the issue. These rotors and pads have been on my car for the last 4 years, and now just giving me pulsation in the brake pedal.
I think that they were hot, when I went thru a car wash, and the water shocked them, causing them to warp. I called multiple machine shops, and none of them turn rotors these days. I've been told rotors are cheap, so no one turns them anymore.
So, I'm just going to replace both front and rear rotors and pads, along with the wear sensors. I will be using the same Power Stop Carbon Ceramic pads, that I used for the last 4 yrs. I will be keeping these old rotors, hopefully I'll eventually find a machine shop that can resurface them.
Here's the issue, since their crossed drilled and slotted, resurfacing them is tricky, as the crossed dilled holes create hot spots on the rotors and pads, if there not chamfered correctly. So, I'm leaning more towards having new friction rings made for them from Coleman Racing.

 

Can you show a picture of your current rotors? Are they perhaps bluish or have spots on them?

 

These rotors do not have any scorch or heat marks, there isn't any visible signs that they are warped. And are smooth, there isn't even a lip on them. They are however 4 1/2 yrs. old. I installed them myself.

 

I can turn any rotor at my shop but.....only if you are just looking to make a new surface for a pad change and that's all I would recommend. Also a rotor can look perfectly normal and be very warped and will really show itself on the brake cutting machine.
I have a love for brakes/stopping fast just as much as going fast so here is some information for anyone going down this road that may help you.
Fact: Your rotor is warped from heat. Cutting the warp out will be possible but WILL return quickly and this is because the steel has "reorgainized" itself and not in a good way. I have recut warped rotors over and over after track events and proven this to be the case with out a doubt.
If you really want to take your rotors to the next level send them to a company called 300 Below. For $100.00 they will do a 300 degree below -0- treatment that will "realign "the metal structure,make it harder and stronger and will out perform your expectations.I have never warped a rotor from them after treatment and I have used them for everything....ring and pinions, bearings,RC Heli parts that would break or bend constantly,RC boat props that would bend or break from high rpm,transmission parts for the 722.6 that make them practically bullet proof...you name it in steel they can do it.
Go to 300 Below Cryogenics and click on the brake rotor section and you can get a better education . Good luck !!!

 

Interesting for sure. lots of info on their site.

https://www.300below.com/cryo-rotor-brake-rotors/

 

SICAMG,

Thank you for this information, I have decided to just change them out for brand new rotors. Cutting these two-piece rotors, with their crossed drilled holes and slots, will create hot spots in the rotor leading to more warping issues in the future.

 

Well the time has come to replaced my warped rotors, the parts have been sitting at the shop for a minute waiting on me to bring in the E63. I'm going to replace the rear rotors as well, I'm using Brembo Carbon Ceramic pads on this go around.
I just love carbon ceramic pads, no dust, no squeal and good initial bite only until the pads are fully bedded in. We are also doing a oil change, draining both the oil pan and oil cooler. And while we are at it, do a 4 wheel alignment as well.

 

Which partnr are the pads?

 

The Fronts are BREMBO P50127N NAO Ceramic
The Rears are BREMBO P50113N NAO Ceramic

 

His is a 63, which has different calipers and pads then the 55.

 

Yeah, I should have mentioned that Thanks for mentioning that UncleBenz55

 

A quick web search, revealed that Brembo does make pads for your CLS55
The fronts are BREMBO P50062N NAO Ceramic
I didn't see anything for the rears by Brembo, but that doesn't mean they don't make them.

But your probably better off going with Akebono.
The fronts are AKEBONO EUR983 Euro Ultra Premium Ceramic Pad
The rears are AKEBONO EUR984 Euro Ultra Premium Ceramic Pad

 

Thx for the Akebono tip, but those are very hard to come by in the Netherlands. In other words, I will then have to resort to import, which means extra importing costs. Brands which are available here: Brembo / ATE / Hella Pagid / TRW / Zimmermann / ABS / Textar / Ferodo / EBC / Mintex

 

I believe that EBC makes a carbon ceramic pad, but I'm not sure if its for the E63 or E55. It's funny, but I can get all these different name brand pads here in the US.

 

PM'd you, @Yuille36

 

I was planning on having new friction rings made up for these rotors, but you seem to need them more than I, so I'm willing to sell them to you.

Below is the quote, I received from Coleman Racing regarding the manufacturing of new friction rings for the aluminum hats. The price is on par with buying brand new Brembo two-piece rotors, just so you know. But, in return you'll get a true direction rotor. I just sent you a PM.

William,
The following is the cost for the brake rotors.
I also included the options.

17598 Casting, machined to specs……………..$275.79 ea.
Options:
18841…Stress Relieve………………………$ 24.68 ea. rotor
18842…Balance………………………………..$ 29.83 ea. Rotor (Recommended due to diameter of disc)
18843..Crossdrill (Standard Pattern)…….$ 65.50 ea. rotor
18844…Gas Vent (Standard Pattern)…….$ 24.80 ea. rotor

Lead Time: 10 working days


Thank You,
Glenn Myers
Coleman Racing Products
(800) 221-1851 ext 122
glenn@colemanracing.com

 

​​​​​​​do you know how hot your brakes would have to get for this to be true?

 

The fact remains that, I had a pulsation when braking from speeds higher than 70 mph. At first, I thought that it was the pads. The issue was discussed with the community and my tech.
Some have mentioned having them turned, but machine shops are reluctant to perform this task as the crossed drilled holes and slots will break machine bits.
But I do get your point, that rotor must get cherry red to produce warping then sprayed with water. But this is a mute point now, as I have just replaced my pads and rotors, with all new parts. It's bedding-in time now.
As you can see virtually no wear on the friction ring.