Dual Multi Piston Brake Caliper Press Tool Heavy Duty Brake Caliper Compression Piston Compressor Tool for 1 2 4 6 Piston Brake Pads Spreader. Efficient Caliper Piston Compressor Tool: Easily retracts or compresses pistons smoothly and evenly with our brake caliper press, ensuring safe and hassle-free brake pad s without damaging components.