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QDD-3N left and right normal braking caliper disc brake
QDD-3N left and right normal braking caliper disc brake
QDD-3N left and right normal braking caliper disc brake is driven by springs. As usually, QDD-3N brake's spring quantity is 8 pieces. When reduce its spring quantity, then its braking force is less, too.

On the other hand, this QDD-3N left and right normal braking caliper disc brake's braking force is determined by braking disc diameter, when braking disc diameter larger, then its braking force is larger, too.
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