What should we check before? 

Regularly check all tires regularly, at least once a month or whenever necessary, for example, before a longer route or a trip on uneven ground:
Checking tire pressure More
Visual inspection of possible tire and tire damage
Verification of valve caps
The valves must be protected against damp and dirt with specially designed caps for your vehicle by Mercedes-Benz.
Visual inspection of the profile depth and tread surface along its entire width.
The depth of the minimum profile is 3 mm for summer tires and 4 mm for winter tires.