2. Tire treads with normal pressure on balanced and correctly installed wheels, as well as on serviceable shock absorbers, wear evenly. In general, it is difficult to assess the durability of tires from different manufacturers, since it depends on many factors, and above all, on the type of surface on which the car is used, on the tire pressure, on the driving style and climatic conditions. A sporty driving style with high acceleration and sharp braking shortens the service life of tires.
Important: The minimum tread thread depth over the entire surface is 1.6 mm. However, for safe driving, it is recommended to replace the tire if the groove depth on the tread surface decreases to 3 mm. Tire manufacturers are increasingly placing 1.6 mm high tire wear limit indicators on the tread. The appearance of continuous transverse stripes on the tread surface indicates its complete wear and the need for replacement. Tires with the M+S designation maintain the necessary grip on snow-covered surfaces and in sleet when the threads of their profile are at least 4 mm deep. It is necessary to check for cuts or cracks on the tire surface. Using a small screwdriver, determine the depth of the cracks noticed. If the cut reaches the tire braid, water getting there will cause rapid corrosion of the steel braid wire and separation of the tread from the braid. Such a tire threatens a sharp loss of pressure at any time, therefore, for safety reasons, a tire with a deep cut must be replaced.
3. Checking the valves:
a) Unscrew the protective cap of the valve.
b) Apply a little saliva to the outlet of the valve. If a bubble forms at the outlet, it means that the return valve needs to be pressed with the back of the cap.
c) Recheck the valve. If air bubbles still form at the outlet, the check valve must be replaced.
d) It is necessary to tighten the protective cap again.
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