Momentary or constant? if momentary I assume there is a relay or
capacitor in the trigger that applies the voltage.
trigger switch is 'off' (effectively shorting the motor). The most
common fault, by far, is the trigger switch has succumbed to dust
intrusion (easily fixed with a blast of compressed air). Sometimes the
brushes get worn to the point that they no longer seat properly and
cause the same braking problems.
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