Volkswagen Polo Service & Repair Manual: Wear Spots
| Wear spots are caused by a hard stop with locked wheels
whereby the rubber compound is abraded from the contact patch. |
| When the tires slide across the road surface, frictional
heat is generated which reduces the abrasion resistance on the
tread compound. |
| Even the most abrasion-resistant tread compound cannot
prevent wear spots which can occur during extreme braking. |
| Even ABS cannot completely prevent brief locking and the
resulting slightly flat spots. |
| The degree of abrasion is primarily dependent on the vehicle
speed, road surface and tire load. For clarification see the
following examples. |
| If a vehicle with locked front wheels is decelerated until
it comes to a stop, the abrasion of rubber on the post card
sized contact patch is approximately |
| from 57 km/h (35.41 mph) = 23.8 m braking distance, up to
2.0 mm, |
| from 75 km/h (46.60 mph) = 41.8 m braking distance, up to
3.3 mm, |
| from 92 km/h (57.16 mph) = 71.6 m braking distance, up to
4.8 mm. |
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| Tires with this type of damage cannot be used and must be
replaced. |
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Rolling noise perceived by the human ear is caused by
vibrations transmitted from the noise source to the ear via the
air.
Here we are interest ...
Other materials:
Special Connector Systems
Note
If necessary, housing securing mechanisms (secondary locks)
must be released or removed using specified tool before
releasing the contacts. Refer to
→ Chapter „Secondary Lock“.
...
Contents
Fig. 162 Contents of the vehicle
toolkit
First read and observe the introductory
information and safety warnings
The content of the vehicle toolkit depends on the vehicle equipment level.
The following describes the maximum scope.
The vehicle toolkit contains the following
Screwdriv ...
Joint-Free Wiper Blade Characteristics
Characteristics for Bosch and Federal Mogul
Check the manufacturer when replacing the wiper blades.
Always replace them with blades made by the same manufacturer.
The wiper blades can be identified by the wiper arm mount.
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Tires, Rolling Noises, General Information