A detail of the rear axle of West Mon Leyland Alpine Beaver 13, AAX27. This shows what I believed to be a ratchet and pawl mechanism, but on looking at it again I'm not sure. Whatever we are seeing inside the tyres is not the normal edge of a brake drum. However, I do seem to recall someone at West Mon saying they still had the sprag brake mechanism off the PD2 (also 13) and it fastened to the brake drums.
Photo taken by David Beilby, Sunday 5 October 1980, West of England Transport Collection, Winkleigh
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