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ML320: when new=25mm, wear limit (min spec)=23.0mm, wear limit for maintenance service=23.5mm. That has a floating caliper. 23.0 is what's stamped into the rotor (the min spec).
On a truck with a FIXED caliper, such as an ML430:
new=32.0mm, wear limit=29.4mm, wear limit for maintenance service=30mm, BUT what I found is for some odd reason, the have 30.0mm stamped on the rotor, but as I recall, it did NOT say "min spec" prior to the 30.0mm. Really odd.
For the rear rotors
for models like the ML320 with a floating rear caliper:
new=15mm, wear limit 13mm, service spec 13.5mm ("wear limit for maintenance service" is what is normally caled the service spec)
for models with the fixed rear caliper, like the ML430:
New=14mm, wear limit=12mm, service spec=12.5mm
Gilly
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