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) |
|
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|
| 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:
Refrigerant circuit components
Caution
Non-authorised tools or materials (e.g. leak
inhibitor additive) may cause damage or adversely
influence the system.
Only tools and materials approved by the
manufac ...
Introduction
This chapter contains information on the following subjects:
→ Display and indicator lamps
→ Function
→ Switch off the lane departure warning system in the following situations
Additional information and warnings:
Exterior views
Volkswagen in ...
Switch off the Adaptive Cruise Control (ACC) temporarily in the following situations
First read and observe the introductory information
and safety warnings The Adaptive Cruise Control (ACC) should be switched
off in the following situations due to system limitations :
When turning off roads, driving around roundabouts, narrow curves, joining
motorways, exiting from ...
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General notes on tyre noise