Originally Posted by Chuck33079

Take it out. It's there to make sure you don't put the rears on the front.

Originally Posted by schellingr

That bolt you can remove it. Its only function is for you not to put the rear tires on the front axle.

Originally Posted by JARblue

You can remove it. It is there to prevent idiots from putting the rear wheels on the front. It can also help remove rusted rotors - unscrew the bolt to remove the sleeve and then screw the bolt back until the rotor pops off.