Mercedes-Benz C-Class Manuals

Mercedes-Benz C-Class Owners Manual: Notes on tire pressure

WARNING Risk of accident due to insufficient or excessive tire pressure
Underinflated or overinflated tires pose the following risks:
  • The tires may burst, especially as the load and vehicle speed increase.
  • The tires may wear excessively and/or unevenly, which may greatly impair tire traction.
  • The driving characteristics, as well as steering and braking, may be greatly impaired.
  • Comply with the recommended tire pressure and check the tire pressure of all tires including the spare wheel regularly:
  • at least once a month
  • when the load changes
  • before embarking on a longer journey
  • if operating conditions change, e.g. off-road driving
  • Adjust the tire pressure as necessary.

Driving with tire pressure that is too high or too low can:

  • Shorten the service life of the tires.
  • Cause increased tire damage.
  • Adversely affect driving characteristics and thus driving safety, e.g. due to hydroplaning.
WARNING Risk of an accident due to insufficient tire pressure
Tires with pressure that is too low can overheat and burst as a result.

In addition, they also suffer from excessive and/or irregular wear, which can significantly impair the braking properties and the handling characteristics.

  • Avoid excessively low tire pressures in all the tires, including the spare wheel.

Tire pressure which is too low can cause:

  • Tire defects as a result of overheating
  • Impaired handling characteristics
  • Irregular wear
  • Increased fuel consumption
WARNING Risk of accident from excessive tire pressure
Tires with excessively high pressure can burst because they are damaged more easily by highway fill, pot holes etc.

In addition, they also suffer from irregular wear, which can significantly impair the braking properties and the handling characteristics.

  • Avoid excessively high tire pressures in all the tires, including the spare wheel.

Excessively high tire pressure can result in:

  • Increased braking distance
  • Impaired handling characteristics
  • Irregular wear
  • Impaired driving comfort
  • Susceptibility to damage
WARNING Risk of accident caused by repeated drop in tire pressure
If the tire pressure drops repeatedly, the wheel, valve or tire may be damaged.

Insufficient tire pressure can cause the tires to burst.

  • Inspect the tire for signs of foreign objects.
  • Check whether the wheel or valve has a leak.
  • If you are unable to rectify the damage, contact a qualified specialist workshop.

You can find information on tire pressure for the vehicle's factory-installed tires on the following labels:

  • Tire and Loading Information placard on the B‑pillar of your vehicle.
  • Tire pressure table on the inside of the fuel filler flap.

Observe the maximum tire pressure.

Use a suitable tire pressure gauge to check the tire pressure. The outer appearance of a tire does not permit any reliable conclusion about the tire pressure.

Vehicles with a tire pressure monitoring system: You can also check the tire pressure using the on-board computer.

Only correct tire pressure when the tires are cold. Conditions for cold tires:

  • The vehicle has been parked with the tires out of direct sunlight for at least three hours.
  • The vehicle has traveled less than 1 mile (1.6 km).

A rise in the tire temperature of 18 ºF (10 ºC) increases the tire pressure by approx. 10 kPa (0.1 bar/1.5 psi). Take this into account when checking the tire pressure of warm tires.

The tire pressure recommended for increased load/speed in the tire pressure table can affect the ride comfort.

WARNING Risk of accident from unsuitable accessories on the tire valves
If you mount unsuitable accessories onto tire valves, the tire valves may be overloaded and malfunction, which can cause tire pressure loss. Tire pressure monitoring systems for retrofitting will cause the tire valve to remain open. This can also result in tire pressure loss.
  • Only screw standard valve caps or valve caps specifically approved by Mercedes-Benz for your vehicle onto the tire valve.
    Tire pressure

    Tire pressure table

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