I have used these on the rear brakes of a BMW M235i. It works well for two-piston rear brakes and works well for four-piston front brakes if you position it in the center of the caliper. I used a Lisle 29100 Quick Quad Pad Spreader for the front wheels, but it won't fit without removing the calipers. Be sure to remove the brake fluid reservoir cap before pushing the pistons back into place. The build quality of the tool isn't great, but it gets the job done for $15.
Universal Car Ratcheting Caliper Piston Tool with 2 Steel Plates - Brake Caliper Press (Red, Two Size)
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ABN Brake Drum Tool Kit - 15-Piece Service Brake Kit with Spring Pliers, Brake Spoons, Pad Gauge, Brake Spring Tool
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