Rotates the piston back on GM and Ford vehicles equipped with rear wheel disc brakes. Use in conjunction with a 3/8 drive tool or the 3342 Disc Brake Adjusting Fixture. Fits GM vehicles with 2-1/8 and 1-7/8 pistons and Ford vehicles 1987 to current with rear disc brakes. This has been tested in the field with professional users and the qu...