Chile Mine Rescue: Is There a Braking Mechanism?

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I've been following up on the rescue efforts and everything but have not seen if there is a braking mechanism on the rescue pod. One that would installed if the cable broke. Does anyone know if there is? My idea would be either a free-fall stopper, one that would expand around the pod and shaft when the weight of the cable was release. Or a magnetic one since some of the shaft has had a sheet metal tube installed.
 
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Steel cables in new condition almost never break. The half inch steel rope on the capsule can hold several hundred tons, and it will have a second rope any - just in case.

The capsule is a fairly close fit inside a tube with stabiliser wheels, it would only drop a few metres before wedging itself sideways - it's always very difficult to lower an object down a tight tube without it wedging when you don't want it to.
 
The design constraints for this type of thing are a lot different from consumer products. For consumer products, the time available to design and prototype the product is a lot longer and safety is a much higher priority. For something like this, the lack of testing makes complexity work against safety since the miners are already in a life-and-death situation and safety features that add complexity also increase the chances of failure.
 
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