Mercedes-Benz GLK-Class 2012 Owners Manual - Manual (Page 260)

X Make sure on/off switch A of the tire
inflation compressor is set to
0.
X Insert plug ? into the socket of the
cigarette lighter (
Y page 222) or into a 12 V
power socket ( Y page 223) in your vehicle.
X Make sure that the SmartKey is in position
1 (
Y page 131) in the ignition lock.
X Press on/off switch A on the tire inflation
compressor to
I.
The tire inflation compressor is switched
on. The tire is inflated. Gauge = shows the
tire pressure.
! Do not operate the tire inflation
compressor for longer than eight minutes
at a time without a break. It may otherwise
overheat.
The tire inflation compressor can be
operated again once it has cooled down.
X Inflate the tire to the specified tire
pressure.
The specified tire pressure is printed on the
yellow label of the emergency spare wheel.
X When the specified tire pressure has been
reached, press on/off switch A on the
electric air pump to
0.
The tire inflation compressor is switched
off.
X Turn the SmartKey to position 0 in the
ignition lock.
X If the tire pressure is higher than the
specified pressure, press pressure release
button ; until the correct tire pressure has
been reached.
X Unscrew union nut : on the air hose from
the valve.
X Screw the valve cap onto the collapsible
spare wheel valve again.
X Stow plug ? and the air hose in the lower
section of the compressor housing.
X Stow the tire inflation compressor in the
designated place in the vehicle.
Lowering the vehicle
G WARNING
Pump up the collapsible spare wheel before
lowering the vehicle. You could otherwise
damage the wheel rim.
X Place the ratchet wrench onto the hexagon
nut of the jack so that the letters
AB are
visible.
X Turn the ratchet wrench until the vehicle is
once again standing firmly on the ground.
X Place the jack to one side.
X Tighten the wheel bolts evenly in a
crosswise pattern in the sequence
indicated (: to A). The tightening torque
must be
110 lb-ft (150 Nm).
G
WARNING
Have the tightening torque checked
immediately after a wheel is changed. The
wheels could come loose if they are not
tightened to a torque of
110 lb/ft
(150 Nm).
X Turn the jack back to its initial position and
store it together with the rest of the tire-
change tool kit in the cargo compartment.
X Transport the defective wheel in the cargo
compartment.
For further information on stowing the
collapsible spare wheel, see (
Y page 253).
i When you are driving with the collapsible
spare wheel mounted, the tire pressure
loss warning system or the tire pressure
258
Flat tire
Breakdown assistance