Its not the same on all cars. They're actually pretty different depending on the brake setup. Like if its 4 piston, 2 piston, 1 piston, drum brakes, etc..... The biggest difference is more dependent on what make the car is. For example most Japanese cars only need a 14mm wrench and 17mm wrench to change out the brakes and rotors while most German cars need 16mm wrench, allen keys, philips screwdriver and a few other tools to change out brakes and rotors.