Dozens of threads on this subject. Most likely is the "Brake rings", remove the auto locking hubs and you'll find a ring that should have some lugs on it's inside edge. These have usually sheared off. Probably just one side that has gone but best to check both. some of us lost patience with Auto Lockers and bought manual lockers from Milners instead, some like the idea others don't. Check out the downloads section as there are two workshops that will be of use even if it just gives you an idea of what it all looks like. One on cleaning the auto locking hubs and the other is instructions on changing to manuals, like I said they will give you an idea of what to look for.
Jim T
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