MOst VFD will activate the Brake below a preset RPM. IF you are going faster then it waits until the level drops to take rpm and applies the brake.
On some units IF you are running at say 18,000 and the brake limit is 10,500 then you may be able to stop the spindle quicker IF you call a speed that is just under the brake limit say S10000 and then turn off the spindle M5.
Just a thought, (;-) TP