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On the backing plates though ..
I'm by no means certain that all monster rear calipers are fitted with them.
In fact they may be a rarity, I dunno, my info is limited.
Ok, so how about this ...
Firstly, your pistons are retracting too far, thus allowing too much clearance and allowing the pads room to rattle further than they normally would.
Secondly, the leading edge of the pads tends to dig in (perhaps more so without the backing plates ?) and thus the pads wear to wedge shaped, thicker at the trailing edge.
Since the trailing edge is thicker, and becomes the leading edge when the wheel is rotated backwards, this picks up first on the disc and pulls the pads so that they tip to an exaggerated position due to the excessive clearance, the result being a wedging action which locks the wheel.
Does that make any sense ?
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