When I purchased some aftermarket brake drag reduction clips for a prior vehicle (2005 Tacoma) I found that a single factory clip actually had more pushing force than two aftermarket clips. So when I got my 1999 4Runner, I ordered factory Toyota clips (not expensive if already purchasing other parts to save shipping) and put one on each side of each caliper. (I also put new calipers on... clips don't help when a cylinder won't retract) I tried stacking two on each side, but inevitably that never worked right and one would bind up and make it worse.
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