The wheel is manufactured from steel with a hub and a radial wheel disc with faced surfaces each side and a rim flange contng. spaced borings either side to house the disc centralising system. A brake disc manufactured from cast iron is fitted in the annular hollow chamber each side of the wheel disc formed between the rim and the hub. Each disc consists of two rings arranged in a parallel plane and connected to each other by ribs. The outer surfaces of the inner rings are lined with material whose friction coefficient is higher w.r.t. that of steel (the wheel) then cast iron (the brake shoe). The disc centraliser consists of a sprung flexible metallic bush held in the disc rib projection. Braking force is applied to each disc and owing to the difference in friction coefficient the disc will not turn w.r.t. the wheel.
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