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Removing and installing metal valve body > < Exploded view of tyre pressure monitor

A3 Mk1

Changing a tyre
Changing a tyre
The valve core must always be renewed if a tyre is changed.
The metal valve and the wheel electronics can be reused.
–  Release air from tyre by unscrewing valve core.
  Note
t  On rims with bonded wheel trims, take care not to scratch the wheel trims.
t  Wheel trims have a very sensitive surface.
t  If a wheel trim is damaged, the rim must be renewed.
   
t  The wheel trim cannot be renewed.
–  Remove tyre → Fig.
Removing run-flat tyres → Chapter
–  Perform visual inspection to check for loose or damaged components. Renew complete valve assembly if attachment points are loosened/detached.
  Note
Always renew damaged wheel electronics.
  A44-10265
Removing tyre
Roll off or unseat tyre.
When using an unseating tool, first press off the tyre on the side opposite the valve.
Unseating tools must not be used in hatched area -a-.
–  Position head of installing tool close to valve so that tyre iron can be applied approx. 30° -b- away from valve.
–  Then pull off the tyre in the valve area first.
Fitting run-flat tyres → Chapter
  A44-0087
Fitting tyre
Unseating tools must not be used in valve area.
  Note
t  On rims with bonded wheel trims, take care not to scratch the wheel trims.
t  Wheel trims have a very sensitive surface.
t  If a wheel trim is damaged, the rim must be renewed.
  A44-0088
t  The wheel trim cannot be renewed.
–  Position wheel electronics approx. 180° opposite head of installing tool.
–  Press tyre into well base approx. 90° in front of installing tool -arrow-.
–  Screw in new valve core.
–  Fit tyre.
–  Inflate tyre and screw plastic cap back on.
–  Balance tyre → Chapter.
–  Fit wheel.
  A44-10265

Removing and installing metal valve body > < Exploded view of tyre pressure monitor