ML320 Rotor Minimum Thickness - PeachParts Mercedes-Benz Forum

benztech13 · #1 05-15-2006, 08:19 PM

Minimum thickness for rotors on a ML320 are as follows; front 23.0mm and rear 13.0mm. This is for a stock rotor. Check to make sure your rotors are oem and not aftermarket. It's your call whether or not to replace the rotors at your 2nd brake change, but truefully most ML models don't make it to the second brake pad change before the rotors are below min specification. Actually I see quite often that when the pad light comes on for the front pads that the rotors are only about .5mm above min specification and I usually suggest replacement at that time. Whether or not I suggest replacement usually depends on when the next state inspection is due. It doesn't make any sense to just replace the pads if your state inspection is coming up and your rotors are getting close to min. spec. I've also seen some of these mercedes models have the rotors wear out before the pads do. Hope this helps
Dustin

tt33 · #2 11-25-2008, 01:55 PM

Quote:

Originally Posted by benztech13

Minimum thickness for rotors on a ML320 are as follows; front 23.0mm and rear 13.0mm. This is for a stock rotor. Check to make sure your rotors are oem and not aftermarket. It's your call whether or not to replace the rotors at your 2nd brake change, but truefully most ML models don't make it to the second brake pad change before the rotors are below min specification. Actually I see quite often that when the pad light comes on for the front pads that the rotors are only about .5mm above min specification and I usually suggest replacement at that time. Whether or not I suggest replacement usually depends on when the next state inspection is due. It doesn't make any sense to just replace the pads if your state inspection is coming up and your rotors are getting close to min. spec. I've also seen some of these mercedes models have the rotors wear out before the pads do. Hope this helps
Dustin

What is the minimal thicknes of ML320 front brake pads? And how do I measure it correctly? Thanks!

lkchris · #3 11-26-2008, 04:10 PM

There's zero/zip/nada reason to think the minimum thickness specification isn't the same for OE and aftermarket rotors. It has as much to do with maximum extension of caliper pistons as anything.

It's a silly question to ask if it's needed every time, every other time, or whatever. It's needed when the rotors are at or below minimum thickness. Consideration should also to be given as to whether they will wear past minimum thickness during the lifetime of the new pads about to be installed.

Skimping on any maintenance is foolish and skimping on brake maintenance about the dumbest of all.

To expect a professional service facility to play games with your safety--even if you requrest it--is to miss the point.

ARNOLDLewis · #4 11-27-2008, 09:16 PM

to know the minimum thickness of the rotor: it is stamped on the inside of the rotor. Just remove them and have a look.