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What is an electric brake on a cordless impact driver?

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Tortoise and the hare next to each other on the starting line If a cordless impact driver has an electric brake, it means the chuck will stop turning as soon as the speed control trigger is released. Nowadays, most cordless impact drivers have an electric brake. However, when cordless impact drivers first came on to the market, the tool could take several seconds to stop completely once the speed control trigger had been released.
Battery level indicator on a red cordless drill driver Manufacturers claim that an electric brake conserves battery power and decreases the likelihood of injury caused by a spinning bit.