The springs must be for additional cooling since they add cooling surface—nice to have in heavy braking but not essential in “normal” driving.
Over the past 40 years I have found drums with them missing and have had a few break from rust. Didn't seem to make a difference if the shoes were matched to the drums and all lube surfaces were rust free and greased.
Posted by: "Terry & Andree Hoeman" <tehoema@xxxxxxxxxxxxxx>
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