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It depends on where the air supply for this lever/switch comes from and how close to the spring brake chamber the pipe goes, but yes, the intention is that when all else has failed and the vehicle needs to be dragged off the highway, then the emergency brake release can avoid having to get down and dirty with the wind-off spanner.
Of course, if the spring brake chamber seal is knackered you will still need to wind it off mechanically!
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