| The hydraulic disk brake has the characteristics of the simple structure, small volume and large moment and so on. It is often used as a kind of safety braking device on the power equipment. The brake's reliability is vital to the safety work of the power equipment and the operator.The paper introduces the principle, the characteristics and the structure of the hydraulic disk brake. The paper analyses the feature of the friction material and the distribution of the frictional temperature field, and points out the method of selecting the appropriate material on the different condition. The paper establishs the temperature mathematical model which is used to calculate the detecting temperature, and analyses the reasons that lead to the invalidation of the disc brake. Because the frictional material is replaced on the regular time according to the experience and the degree of the abrasion can't be judged exactly, the detecting system online is developed. The system dectects the temperature and abrased displacement by respective sensors, it deals with data and analyses data by the single chip computer. Therefore, the system can dectect the temperature and the abrased displacement online, it can store these data and judge these data exceed the safety range of the temperature, the displacement or the heat fatigue strength of the friction material or not. If data exceeds the safety limit,it will sound the alarm.The successful development of the hydraulic disk brake which have the characteristcs of detecting online can solve the problem of replacing the friction material according to the experience , it can provide a very scientific basis to replace the friction material for the disk brake, and can reduce the waste of labour and material effectively. The hidden trouble is reduced, and the safety reliablity of the equipment can be increased. The development of the detecting system online is significant to the engineering.
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