Hi Peter
The Min Thickness on your front brake rotors
is stamp on the rim of the brake rotor.
That show you the safe thickness on your brake rotors.
Have your mechanic check it first.
If rotor are too thin,You have to replace it.
Because when rotor down below fectory min specs it will warped & crack easily and you don't want happen to you.
Good luck to you !

------------------
MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner