- [Fit for Disc Brake] This brake caliper press tool features two sets of push boards measuring 7.01x2.36 inches and 4.53x2.17 inches. It is compatible with most single and twin piston floating calipers, as well as twin and quad piston fixed calipers, and some sextuplet piston fixed calipers. Ensure your caliper's piston space can accommodate the spreader. - [Working Principle] The tool operates by expanding to push the boards or retracting after use via an adjustable switch. In expanded mode, a centrally located ratchet screw delivers uniform thrust to the push boards, allowing for simultaneous pushing of multiple pistons. This design effectively saves energy and enhances efficiency. - [How to Use] Align the push boards centrally with the pistons on both sides. Apply pressure evenly to engage the pistons. Swing the handle to push the boards until the pistons reach the desired position. Finally, adjust the switch to retract the boards and remove the spreader. - [Size Reference] Push board sizes: 7.01x2.36 inches and 4.53x2.17 inches. Telescopic range: fully retracted at 1.88 inches and fully expanded at 3.03 inches. - [Use Scenarios] Ideal for brake pad replacements, this tool streamlines the process of resetting caliper pistons. Perfect for mechanics and DIY enthusiasts alike, it simplifies maintenance tasks on a variety of vehicles. Use it in a garage or home workshop for efficient brake system repairs.