| Points to check before and during the test drive: |
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| Check for possible damage to suspension components of the front and rear axles. |
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| Check tyres visually for exterior damage, punctures, cuts, bulging sides, flattening and/or damage to the tread. |
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| Ask the client whether there have been any flat tyres which were repaired in a workshop; replace the tyre if necessary; |
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| Check tyres for uniform wear and tread depth. |
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| Check all the tyres are the same type, make and have the same tread pattern. |
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| If the tyres do not have a stipulated rotation direction, check whether the tyre DOT markings are on the outside. If not, the rims / tyres have been previously interchanged; |
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| The road surface should be straight and flat, without lateral cambers or dips. |
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| Carry out the test drive in the company of client, following the above-mentioned points(the client should drive in order to demonstrate the complaint). |
Note | The test can not be carried out in the event of strong side winds |
| If the complaint is justified, the wheel rims / tyres should be interchanged as described below: |
| Before commencing, the following instructions should be observed. Otherwise, the work may be carried out in vain |
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| Mark the wheels / tyres before interchanging for the first time, for example with LF, RF, LR and RR. |
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| After interchanging the wheels or turning the tyre on the wheel rim, the performance of the vehicle should be checked on a test drive. Make a note of how and what has changed. |
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| Assess the intensity of or possible modification to the lateral pull. |
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| It is also important that the test drives are made by the same person and along the same roads. It is best to drive along the road in both directions. |
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| Replacing a tyre with a new tyre does not necessarily guarantee that the pulling to one side will be eliminated. A selective interchanging of the tyres should first be carried out as described below. |
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| Where there is considerable difference in the tread depth of the tyres on the front axle in comparison with the tyres on the rear axle, the tyres with the better condition tread should always be fitted on the front axle. |
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