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QDD-2N spring engaged air release caliper disc brake
QDD-2N spring engaged air release caliper disc brake is normally in braked status, it is controlled by spiral springs.

So QDD-2N spring engaged air release caliper disc brake's working theory is different with normal release brake. As usually, this QDD-2N spring engaged caliper disc brake is locked by springs, after inputting air source, then this brake released for rotating. It is a kind of safe brake.
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