✨ Brake Caliper Compression Tool, 4 Piston Brake Caliper Tool for Single/Twin/Quad Piston Calipers, 29100 Brake Pad Spreader Compatible with Most Cars and Light Trucks (Red) ✨. Effortless Operation: The brake caliper spreader tool is easy to use insert it into the caliper, squeeze the handle until the plunger touches the inner pad, and keep pressing to compress pistons.