Hah, in the middle of composing an answer I realized we already put it in the Talon SRX User's Manual.
So here's a snippet...
Quote:
2.1. Brake & Coast Modes
The Talon SRX has two modes: Brake and Coast. When a neutral signal is applied to the Talon SRX
in Brake mode, the motor will resist rotation, especially high speed rotation. This is accomplished by
essentially shorting the motor leads together, which causes a Back Electromotive Force (Back-EMF)
to resist the rotation of the motor. Brake mode does not have any effect when the motor is not rotating,
but can make a large difference in robot behavior when used on a motor attached to a high reduction
gearbox. Brake mode does not impact performance when the motor is being driven by the Talon SRX.
When a neutral signal is applied to the Talon SRX in Coast mode, Back-EMF will not be generated,
so the motor’s rotation will not be affected by the Talon SRX.
An added feature of the Talon SRX is its ability to toggle between Brake & Coast modes during
operation using CAN bus.
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