2010 evo x gsr sss
how do i remove the leather e brake cover to install the aluminum e brake cover?

 

Check to see if it has a tiny screw under it, I have the aluminum handle and it has a tiny screw under it.

 

i did it a couple of days ago.
if the one that you have now is the stock plastic one, just pull it hard, try to do it rotating a little bit the handle in both directions. the OEM instructions recomend to use a heat gun a little to heat up the plastic. i didn't need it.
to install the aluminum one, as monkey say, there is a little screw under the handle, don't screw it to hard or it will get stuck, this little screw is just for guide. then install the handle and put the other two screws in the handle.