Manual Mercedes B-Class Electric Drive 2017 (page 264 of 290) (English)

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Important notes on tire pressure

WARNING

If the tire pressure drops repeatedly, the

wheel, valve or tire may be damaged. Tire

pressure that is too low may result in a tire

blow-out. There is a risk of an accident.

Check the tire for foreign objects.

Check whether the wheel is losing air or the

valve is leaking.

If you are unable to rectify the damage, con-

tact a qualified specialist workshop.

WARNING

If you fit unsuitable accessories onto tire

valves, the tire valves may be overloaded and

malfunction, which can cause tire pressure

loss. Due to their design, retrofitted tire pres-

sure monitors keep the tire valve open. This

can also result in tire pressure loss. There is a

risk of an accident.

Only screw the standard valve cap or other

valve caps approved by Mercedes-Benz for

your vehicle onto the tire valve.

Use a suitable pressure gauge to check the tire

pressure. The outer appearance of a tire does

not permit any reliable conclusion about the tire

pressure. You can also check the tire pressure

using the on-board computer.

The tire temperature and pressure increase

when the vehicle is in motion. This is dependent

on the driving speed and the load.

Therefore, you should only correct tire pres-

sures when the tires are cold.

The tires are cold:

if the vehicle has been parked with the tires

out of direct sunlight for at least three hours

and

if the vehicle has been driven less than 1 mile

(1.6 km)

The tire temperature changes depending on the

outside temperature, the vehicle speed and the

tire load. If the tire temperature changes by

18 ‡ (10 †), the tire pressure changes by

approximately 10 kPa (0.1 bar/1.5 psi). Take

this into account when checking the pressure of

warm tires. Only correct the tire pressure if it is

too low for the current operating conditions. If

you check the tire pressure when the tires are

warm, the resulting value will be higher than if

the tires were cold. This is normal. Do not

reduce the tire pressure to the value specified

for cold tires. The tire pressure would otherwise

be too low.

Observe the recommended tire pressures for

cold tires:

on the Tire and Loading Information placard

on the B-pillar on the driver's side

in the tire pressure table in the charge socket

flap (Y page 124)

Underinflated or overinflated tires

Underinflated tires

WARNING

Tires with pressure that is too low can over-

heat and burst as a consequence. In addition,

they also suffer from excessive and/or irreg-

ular wear, which can severely impair the brak-

ing properties and the driving characteristics.

There is a risk of an accident.

Avoid tire pressures that are too low in all the

tires, including the spare wheel.

Underinflated tires may:

overheat, leading to tire defects

adversely affect handling

wear excessively and/or unevenly

have an adverse effect on energy consump-

tion

Overinflated tires

WARNING

Tires with excessively high pressure can burst

because they are damaged more easily by

road debris, potholes etc. In addition, they

also suffer from irregular wear, which can

severely impair the braking properties and the

driving characteristics. There is a risk of an

accident.

Avoid tire pressures that are too high in all the

tires, including the spare wheel.

262

Tire pressure

Wheels and tires

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Mercedes B-Class Electric Drive 2017 Manual

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