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. |
|
|
|
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:
Technical conditions
The wheel and tyre combinations and conversions listed in
the tables of the individual vehicles refer exclusively to
genuine wheel rims.
Approval of wheel and tyre combinations or a change to
wheels from the accessories trade is no ...
Checking maximum wheel lock
The maximum wheel lock is determined with the aid of the
wheel alignment computer.
–
When the values for the maximum wheel lock lie outside the
tolerances, then check following:
Are steering or suspen ...
Notes on tow-starting
First read and observe the introductory information
and safety warningsVehicles should not be tow-started wherever possible.
Use jump leads to start the engine instead .
For technical reasons, the following vehicles cannot be tow-started:
Vehicles with an automatic gearbox.
Vehicle ...
© 2016-2024 Copyright www.vwgolf.org
General notes on tyre noise