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Yes, I've driven Telma retarders, and they were effective though heavy and expensive (I believe). Also the bearings were susceptible to wear. It would be interesting to receive comment from those who ran them on large fleets for their 'cost of ownership' figures.
Nowadays there are hydraulic retarders (for manual as well as automatic transmissions) that are probably more effective, saving brake wear, though there is a capital cost penalty of course.
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