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    The disc brake has a faster dissipation and drum brake has stronger force? No, we are wrong!

    2019-06-28

    1) The disc brake warms up faster than the drum brake;

     

    We believe that the reason should be that the thermal capacity of the disc brake is smaller. We understands this: relatively speaking, drum brakes are larger and can hold more heat; while disc brakes are smaller and contain less heat, so they heat up faster.

     

    2) The disc brakes have a shorter braking distance, whether hot or cold;

    In fact, in the early stage, without the booster device, the drum brakes can amplify braking force with the rotation of the brake drum; while the disc brake only clamps the brake disc, and the amplification effect is not obtained. Therefore, the concept of "the drum brakes are stronger than disc brakes" spreads.

    However, with the development of automotive technology, now the brakes are equipped with a booster, so the disc brakes can also obtain a large braking force. In addition, the disc brakes respond faster, so the braking distance can be shorter.

     

    3) The disc brake has better thermal decay resistance;

    Disc brakes still provide better braking at higher temperatures. So what is the specific reason? 

    First, at high temperatures, the brakes will expand somewhat. However, the deformation of the two brakes is different:

    The middle part of the brake drum of the drum brake expands even more, resulting in a tighter fit between the brake shoe and the brake drum at both ends, and the middle does not fit the friction well, which in turn accelerates the wear at both ends, resulting in braking Performance is degraded. However, most of the drum brakes now use T-type brake pads,the middle is thick and sides are thin, which can avoid this problem to some extent;

    However, after the disc brake is heated and expanded, the deformation is the same everywhere, and the brake can still be well fitted, the force is uniform, and the braking performance is stable.

    Good performance, but with a hydraulic retarder

    Therefore, the air disc brakes are superior to the drum brakes in both thermal degradation resistance and braking performance - the test scores have already explained this. Moreover, the air disc brakes have a good thermal decay resistance because it radiates well—on the contrary, its temperature is higher—but because its structure allows it to maintain good braking at high temperatures. 

    On the other hand, in the case of frequent braking, the temperature of the air disc brakes will still be very high, even higher than the drum brakes. Differ from the drum brake, the disc brake is directly exposed, and if it is drenched, it will cause the brake disc to crack. Therefore, the disc brakes can't be drenched. If you are driving on a long downhill section, you should be equipped with a hydraulic retarder if you are on the safe side.

     




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