No, it is the design of the brake/lock on the drill output shaft. The chuck is not causing the clunk. I have a Milwalkee electric drill with single slevee and no brake,no clunk, but the shaft locks to tighten the chuck with one hand. When the other brands of cordless drills stop, the brake causes the locking to occur at the same time, and you hear the clunk. On the Milwalkee drill ,it rotates sometimes when you start to tighten the chuck until the it locks, so I think it is independant of the brake .
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