Volkswagen Golf Service & Repair Manual: Flat spots (from locking wheels)
| Flat spots can result from an extreme brake application
which causes the wheels to lock, so that the rubber is worn off
at the contact patch between the tread and the road surface. |
| As the tyres slide over the road surface, friction generates
heat, which also reduces the wear resistance of the tread
material. |
| Not even a highly wear-resistant tread compound can prevent
the flat spots caused by violent braking. |
| Even ABS-controlled brake systems cannot prevent brief
locking of the wheels, and thus, minor flat spots. |
| The degree of such wear depends largely on the vehicle
speed, the road surface and the load placed on the wheel. The
following examples should make this clear. |
| If a vehicle is braked to a standstill on a dry surface with
the wheels locked, the amount of rubber worn from the tyre will
cover an area the size of a postcard and will have a thickness
of: |
| up to 2.0 mm from a speed of 57 km/h (23.8 m braking
distance) |
| up to 3.3 mm from a speed of 75 km/h (41.8 m braking
distance) |
| up to 4.8 mm from a speed of 92 km/h (71.6 m braking
distance) |
|
|
|
| Tyres with such damage must no longer be used and must be
renewed. |
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Tyre noise that can be heard by the human ear is caused by
vibrations which are transmitted by the air from the source of
the sound to our ears.
...
Other materials:
Removing and installing intake manifold
Special tools and workshop equipment
required
Release tool -T10527-
Release tool -T10527/1-
Removing
–
Remove air filter housing
→ Chapte ...
Vibration, vibration control system
Using the vibration control system -VAS 6230 A- you can
perform more functions than just stationary balancing.
A special feature of this system is the testing of the
radial force of the wheel and tyre while rolling.
A ro ...
Description and function of the airbags
First read and observe the introductory information
and safety warnings The airbags can protect vehicle occupants during frontal
and side collisions by reducing their movement in the direction of the collision.
When an airbag is triggered, it is inflated by a gas generator. This causes the ...
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General notes on tyre noise