At the working engine you should not keep a steering wheel in the situation turned against the stop more than 15 seconds. Owing to long finding of operated wheels in extreme situation liquid for the wheel servo-driver strongly heats up.
It can lead to violations in operation of the servo-driver of a wheel.
Each turn of a steering wheel against the stop on the motionless car is accompanied by appreciable noise as the hydropump of the amplifier of a wheel is strongly loaded. Besides, short-term decrease in frequency of rotation of the engine idling is noted.
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