I bought a 1987 560 SL. The brakes vibrated a lot after a couple of weeks
driving. I called the previous owner and he said the the rotors were just
turned. I talked to the MB dealer and they told me to NOT turn rotors - only
buy new. I bought new and the problem went away. My only experience with
brakes. I now have a '97 SL with 72,000 miles and have not replace the brakes
The dealer was telling the truth. MB rotors cannot be turned because they
are CAST. If you use any other rotor, you can have them turned. Check
carpartstogo.com for German Zimmermann cross-drilled rotors at the lowest
price in the U.S. but when you tire of the black brake dust caused by the
black graphite used in all German pads, try coximport .com for "Rotex" pads
which use a very light gray compund and you'll hardly notice it. P.
Most brake rotors are cast. Non - cast rotors are seldom found in passenger
cars. I believe that Zimmerman cross drilled rotors are actually cast too. By
the way, drilling any rotor will damage the heat treatment of the material.
Subsequent heat treatment may be possible but I believe cross drilling is a
poor idea with modern pad materials. And cross drilling has never been shown
to reduce brake rotor temperatures. Drilled rotors look nice and they have
probably sold more Porsche's than any other "improvement". It's still a dumb
The reason that turning Mercedes rotors is not recommended has more to do with
the softness of their rotors. By the time the rotors are worn any significant
amount, turning them will take them below minimum thickness and then you have
to throw them out.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.