They have no service interval. They outlast the "lifetime" of the car. I put quotes on lifetime because it is a term used to refer to no transmission servicing; well understood to mean: no servicing and the lifetime is 100k. By these standards cap an rotor on all MBs are "lifetime" at least.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician