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Daily inspection test
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19. Tires – Leaks

Tire leaking, if leak cannot be heard
You must know the importance of keeping tires properly inflated, appreciate the need to regularly check for leaks, and that a vehicle has this minor defect when a leak appears evident, but cannot be felt or heard in any tire.

Tire flat, if leak can be felt or heard
You must know the dangers of operating with a flat tire, and that a vehicle has this major defect when any tire is flat, or when a leak can be felt or heard.

Procedure:

    • Select one tire of the vehicle and inspect tire for any leaks (listen and feel).
      Note: Kicking the tires or using a mallet to check for flats is acceptable.

20. Damaged tread or sidewall of tire

Damaged tread or sidewall of tire
You must be able to distinguish between the tread and sidewall of a tire, recognizing the visual signs of damage to them, and know that a vehicle has this minor defect when there is damage to the tread or sidewall area.

Tire-tread depth is less than wear limit
You must know how to check tire-tread depth and the minimum allowable depth for various tire positions in vehicle safety regulations, and that a vehicle has this major defect when any tire’s tread depth is below the allowable wear limit.

Tire is in contact with another tire or any vehicle component other than mud flap
You must know that tires should never contact other vehicle components, and while a tire contacting a mud flap is not a safety concern, that a vehicle has this major defect when any tire is in contact with another tire or any other vehicle component.

Tire has exposed cords in the tread or outer sidewall area
You must know that tires are constructed with steel cords inside their casings, which are covered in rubber for protection, and that a vehicle has this major defect when cords are exposed in the tread or sidewall of any tire.

Procedure:

Select one tire of the vehicle and inspect it for:

    1. Damaged tread or sidewall of tire – (any visual signs such as cuts or other damage to treads and sidewalls)
    2. Tire tread depth – to ensure the depth is greater than the minimum allowable depth for the tire positions in vehicle safety regulations (3mm steer tire and 1.5 mm for other tires)
    3. Contact with another tire or any vehicle component other than mud flap – to ensure there is no contact
    4. Exposed cords in the tread or outer sidewall area – to ensure there are no exposed cords in the tread or sidewall of any tire