For '02, the 320 uses brakes from the V8's to accomodate the ~10% weight increase. I don't know if there is an answer to 'which pad is best'. Many have used MINTEX without any problems: performance is similar to the OEM pads with reduced dust generation.
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Tom DeTemple
Denver
'99 ML320 traded @139k miles for---
'02 ML320 traded @45k miles for---
'05 ML350SE now at 50k+ miles
I cannot claim that the 99-01 ML430 pads will be an exact match for the 02ML320+ series. Check with a vendor such as www.epsparts.com or
www.importecparts.com or www.germanstar.com or etc
Wagners seem OK except I don't think sizing exists for 02+ yet.
Front pad milage ranges from a low of 10k (lots of mountains) to above 40k (lots of freeways). Rear pads last at least two front pads.
Wolfgang's site (whnet.com) has links to DIY postings if you are so inclined.