Heisenberg

I've noticed my S63 coupe rear brakes got considerably hotter than the front after regular driving around town. I am also seeing more dust on the rears than the fronts. This is opposite what I always experienced with the CLS63S, so wanted to know if it is normal or there is a problem with the front brakes that is overloading the rears ?

My typical daily driving around here is 35-65mph with traffic lights every 1/2 mi or so. I don't drive aggressively most days because of frequent stops and lots of slow moving vehicles. I have not yet checked temps after fast freeway driving, or aggressive street driving with sudden tops but will do so.

I did have my calipers painted about six months ago, and OEM pads were replaced with Porterfield R4-S at that time. I didn't bother to check front versus rear dust and temps before the new pads were installed. The R4-S are certainly not dust-free but definitely much less than the factory pads, it takes a couple weeks for the wheels to get a coating of brown dust versus a few days with the OEM pads. There is definitely now more dust accumulating on the rears than the fronts. I have not perceived any significant change in brake feel or stopping ability.

My next regular service is not due until June, but if something is amiss I will obviously bring it in earlier to get them checked.

COOPERDB

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Are your front rotors vented

and are the rear rotors solid

If they are solid they will

be hotter

It should have vented rotors

front and rear


Thank-You
D.B.


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Heisenberg

D.B. - yes slotted and vented front and rear

I think your PM probably explains it - EBD system probably using more force on the rear breaks for maximum stability under normal light breaking. I would expect an error light or code too, if the braking system had some malfunction. I wouldn't have ever thought twice about it, except it is the exact opposite of what I experienced with the CLS63S which had the identical drivetrain, but smaller wheels/tires and about 400 fewer pounds.

Rear pads definitely will wear out quicker based on the heat and dust I see, we'll see how they are wearing at the next service interval.

COOPERDB

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Not knowing what the previous owner

did service wise hence the rotor question

The EBD system is harsh on the rear brakes

(regular brakes/pads) on the S63/65 coupe

CCB's are the solution - you know that

You also know how rare CCB's are

Please update pad wear as time permits


Thank-You
D.B.


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