A few days ago at our door and traffic accident. The cause of the accident is because a car drove too fast, and the brake failure, causing car dumper, at that time, next to no one, if there is a person, will lead to serious consequences. The last time to check the car, found to cause brake failure reason is slack adjuster bad. Slack adjuster is to improve braking performance. So, if you find yourself car brake performance is not good, you have to hurry to the 4S shop to repair, in fact, a slack adjuster, but also to spend some money, delayed a few minutes. Sometimes I give the husband also said that, at the end of the week all right, put the car to 4S shop to repair, and let 4S shop staff, check the car brake function etc.. If there is a problem, the best timely repair division.