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In the cicy world there is a primary brake shoe ( front ) and a secondary brake shoe ( rear ) . the primary has a longer pad than the secondary because it does more braking. The military uses the same size shoes for inventory purposes. Somewhere I have the old Raybestos manuals from the 70's that explain it in detail .Assuming the rear wheels don't lock every time you step on the brakes... then all wheels will do (almost) identical number of revolutions during a deceleration from speed X down to speed Y. That, while the pressure applied to every single of all 12 brake shoes is exactly the same. Why should they wear differently?
G.