This problem actually does not have any hard standards, mainly depends on your vehicle maintenance to determine, do not pay attention to maintenance of the vehicle is sure to be replaced 100,000 kilometers, because of serious oxidation, water tank water is not replaced, there is no maintenance outside the water pipe double oxidation, water temperature is high, if the car is not very understanding will be serious to the cylinder overhaul and so on, very serious, The vehicle pays attention to the concept of maintenance repair, which is not only good for the vehicle to drive and the safety factor is relatively high, because the maintenance of good power foot brakes is not easy to damage, and the virtuous cycle.