VW Touran manuals

Volkswagen Touran Service Manual: Foreign Object Damage

Driving over hard, pointed objects like nails, screws and the like can pierce the tire.
This always leads to tire damage.
   
Damage from Imbedded Foreign Bodies
Frequently, the foreign object -marking- is so securely embedded in the tire that it will not free itself even at higher speeds. Due to this, it can act as a plug and seal the tire relatively well. The result is gradual loss of pressure which the driver does not notice immediately but which can lead to sudden and complete tire failure.
  Note
No repair should be attempted on steel belted tires of which the structure has been punctured by a foreign body.
  Foreign Object Damage

Disintegrated Tread

Tires with Torn-Out Tread
Such damage usually develops over a longer period of time. If an already damaged tire is exposed to high stress, the centrifugal force at higher speeds can tear components off the tire.
Illustration shows a tire with torn-out tread due to driving with insufficient tire pressure.
  Disintegrated Tread
    Tire Sidewall Swelling
    A swelling in the flank of the tire indicates that the substructure of the carcass has been damaged.     Typical ...

    Tires, Damage from Low Tire Pressure
    The most common causes of failure are small external damage, a defective valve or a leaky rim due to corrosion or damage.     ...

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