I think on the older disc brake setups, and maybe some modern ones, the
backing plate is nothing really more than a splash guard for the brakes, to
keep excessive water or mud or solid debris off them. It's kind of quarter-moon
shaped. With modern brakes, alot of them no longer use a splash guard/backing
plate. The drum brakes need something to mount the hardware to, whereas all
the braking hardware is contained in the caliper, so usually no external
backing plate behind the spindle is needed or could be fitted anyway, depending
on
design.
Jerry Casper
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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