Automotive brakes professional R & D team, the car brakes design engineers looking for the Hou total. In theory: the car brakes brake disc wear limit of 2 mm, new brakes must be replaced after use to the limit. But in the actual use of them, most owners are not strictly enforce this standard. Change frequency but also to measure their driving habits, a rough measure of the standard as follows: 1, look at the frequency of replacement of brake pads. If the replacement frequency of the film is high, it is recommended that the thickness of the multi-check check the brakes, after all, the costs of your piece faster, illustrate many of you brakes, so regularly check the brakes. 2, according to the state of wear of decision: because of the brake disc in addition to normal wear and tear, as well as foreign body caused because the quality of brake pads or brake disc during normal use, wear and tear, if the brakes to be foreign body wear at a deep ditch or disk wear deviation (thin in some places, in some places thick) proposed to replace, because the deviation of the poor students wear a direct impact on our safe driving.