I've had several internal brake and external brake Cubs. None of the external brakes ever worked very well. All the internal brake tractors worked fine and never needed any attention.
The main thing I see wrong with the internal brake is, it can lock the ring/pinion but it doesn't stop the differential from working. So, in a marginal traction situation, you can lock the input shaft but due to the differential action, one wheel can rotate forward while one spins backwards and you actually have no brakes.
The Cyclops external brakes work great.
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