Get Wheels and tires -> Emergency spare wheel Guide for Mercedes A Class 4 Door Third Generation (2018-2026)

Wheels and tires

321

Tighten the wheel bolts evenly in a diagonal

pattern in the order indicated 1 to 5 with

an initial maximum force of 59 lb-ꢀ (80 Nm).

The following does not apply if the new wheel

is an emergency spare wheel.

Never install more than one emergency

spare wheel or spare wheel that diꢂers

in size.

Vehicles with tire pressure loss warning sys-

tem: Restart the tire pressure loss warning

system (/ page 299).

Tighten the wheel bolts evenly in a diagonal

pattern in the order indicated 1 to 5 with

the speciꢁed tightening torque of 96 lb-ꢀ

(130 Nm).

Only use an emergency spare wheel or

spare wheel brieꢃy.

Do not deactivate ESP^®.

Vehicles with a tire pressure monitoring sys-

tem: Restart the tire pressure monitoring sys-

tem (/ page 298).

Have the emergency spare wheel or

spare wheel of a diꢂerent size replaced

at the nearest qualiꢁed specialist work-

shop. The new wheel must have the cor-

rect dimensions.

WARNING Risk of accident due to incor-

rect tightening torque

Emergency spare wheel

The wheels could come loose if the wheel

bolts or wheel nuts are not tightened to the

prescribed torque.

Notes on the emergency spare wheel

The emergency spare wheel is secured in the

emergency spare wheel bag in the trunk.

WARNING Risk of accident caused by

incorrect wheel and tire dimensions

Ensure that the wheel bolts or wheel

nuts are tightened to the prescribed

tightening torque.

Observe the following notes on removing an emer-

gency spare wheel:

The wheel or tire sizes and the tire type of the

emergency spare wheel or spare wheel and

the wheel to be replaced may diꢂer. The emer-

gency spare wheel or spare wheel can signiꢁ-

cantly impair driving characteristics of the

vehicle.

If you are not sure, do not move the vehi-

Before stowing the emergency spare wheel,

make sure there is no air leꢀ in the tire.

cle. Contact a qualiꢁed specialist work-

shop and have the tightening torque

checked immediately.

If necessary, allow the air to escape.

To release air from the tire: remove the valve

cap of the tire.

To prevent hazardous situations:

Check the tire pressure of the newly installed

wheel and adjust it if necessary.

Press down the metal insert in the valve using

a pointed object, e.g. a pen.

Drive carefully.

Wheels and tires

322

Screw the valve cap onto the valve.

the tire pressure monitoring system cannot

function reliably. For a few minutes aꢀer an

emergency spare wheel is installed, the sys-

tem may still display the tire pressure of the

removed wheel. Only restart the system again

when the emergency spare wheel has been

replaced with a new wheel.

Inꢃatinng the emergency spare wheel

Observe the following notes on installing an emer-

gency spare wheel:

NOTE Overheating due to the tire inꢃation

compressor running too long

The maximum permissible speed with an

emergency spare wheel installed is 50 mph

(80 km/h).

Do not run the tire inꢃation compressor

for longer than ten minutes without inter-

ruption.

Do not equip the emergency spare wheel with

snow chains.

Be sure to also observe the following further rela-

ted subjects:

Requirements:

Replace the emergency spare wheel aꢀer six

years at the latest, regardless of wear.

Comply with the manufacturer's safety notes on

the sticker of the emergency spare wheel and on

the tire inꢃation compressor.

Notes on tire pressure (/ page 293)

Tire and Loading Information placard

(/ page 300)

Check the tire pressure of the emergency

spare wheel installed. Correct the pressure as

necessary.

Remove the sticker with the label 50 mph

Tire pressure table (/ page 295)

(80 km/h) from the tire inꢃation compressor

housing and aꢄx it to the instrument cluster

within the driver's ꢁeld of vision.

Notes on installing tires (/ page 311)

The speciꢁed tire pressure is stated on the

label of the emergency spare wheel.

Installing an emergency spare wheel

(/ page 316)

Remove the tire inꢃation compressor from the

storage well under the trunk ꢃoor

Vehicles with a tire pressure loss warning sys-

tem: If an emergency spare wheel is installed,

the tire pressure loss warning system cannot

function reliably. Only restart the system

again when the emergency spare wheel has

been replaced with a new wheel.

(/ page 275).

Vehicles with a tire pressure monitoring sys-

tem: If an emergency spare wheel is installed,

Wheels and tires

323

Observe the notes on sockets (/ page 107).

Unscrew union nut 2 of ꢁller hose 1 from

the valve.

Press the start/stop button once to switch on

the power supply (/ page 128).

Screw the valve cap of the emergency spare

wheel onto the valve again.

Press on and oꢂ switch 4 on the tire inꢃation

compressor to I.

The tire inꢃation compressor is switched on.

The tire is inꢃated. The tire pressure is shown

on manometer 5.

Store ꢁller hose 1 and plug 3 in the lower

section of the tire inꢃation compressor hous-

ing.

Store the tire inꢃation compressor in the vehi-

cle.

Pump the tire to the speciꢁed tire pressure.

Pull ꢁller hose 1 and plug 3 out of the tire

inꢃation compressor housing.

The speciꢁed tire pressure is stated on the

label of the emergency spare wheel.

Insert plug 7 of ꢁller hose 1 in the socket

on the tire inꢃation compressor and then turn

it until plug 7 engages.

When the speciꢁed tire pressure has been

reached, press on and oꢂ switch 4 on the

tire inꢃation compressor to 0.

Unscrew the cap from the valve on the emer-

gency spare wheel.

The tire inꢃation compressor is switched oꢂ.

Press the start/stop button to switch oꢂ the

power supply.

Screw union nut 2 of ꢁller hose 1 onto

valve.

If the tire pressure is higher than the speciꢁed

pressure, press pressure release valve button

6 until the correct tire pressure has been

reached.

Make sure on and oꢂ switch 4 of the tire

inꢃation compressor is set to 0.

Insert plug 3 in a socket in your vehicle.

12 V socket (/ page 107)

Wheels and tires -> Emergency spare wheel for Your Mercedes A Class 4 Door Third Generation (2018-2026)

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