'99 ML320 Minimum Rotor Thickness - PeachParts Mercedes-Benz Forum

swimman · #1 03-13-2007, 10:29 AM

I'm going to do a brake job on my '99 ML320 and was wondering what the minimum rotor thickness is for the vehicle. If I can get away with just replacing pads that would be great. Thanks for any help.

DCF · #2 03-13-2007, 03:18 PM

It varies based on the rotor's manufacturer. It will be stamped on the "hat" of the rotor, usually on the outside. Generally, you need to do a rotor change every time you do a pad change, that is the way they were designed. The only exception would be if you use ceramic pads, which are much easier on rotors (which is part of the reason they create less dust). Ceramics can go rotors every other pad change, depending on how you drive.

ILUVMILS · #3 03-18-2007, 08:11 PM

Quote:

Originally Posted by DCF

It will be stamped on the "hat" of the rotor, usually on the outside. Generally, you need to do a rotor change every time you do a pad change, that is the way they were designed.

DCF is right in regard to the minimum thickness being stamped on the rotor. However, the rotors do not need to be replaced every time the pads are replaced. Simply measure the thickness of the rotors. If they are at, or above the minimum thickness, you can replace the pads only.

DCF · #4 03-18-2007, 09:57 PM

I agree it is not a REQUIERMENT that they be replaced every time, but I have never seen one running standard pads were the rotors were not shot every time the pads needed to be replaced (or so close to the minimum, it would be a wast to not change them when changing the pads). Measuring is certianly the best way to go.

revan · #5 03-27-2007, 05:02 PM

It"s more like every other time, and I do alot of them.

mplafleur · #6 04-16-2007, 01:28 PM

IMHO, rotor replacement is a huge ripoff.

Original rotors should last 150-200k miles or more. I've never changed mine in almost 180k miles. If you change pads before they hit metal and make sure the caliper/piston travel is ok and nothing is stuck, rotors will wear evenly and last a long time.

If you don't like the cupping or lip and the edge, get the rotors turned. It costs a LOT less, and they will mic them for you and let you know if you hit minimum thickness.