Raphi.
I broke a lever last year and had to replace it. To remove the pivot pin you have to use a tiny allen wrench to remove a tiny set screw that is on the eyelet attached to the pusher pin. The set screw ensures that the pivot pin can not fall out of the lever. Once the set screw is removed, the pivot pin can be pushed through and the pusher pin removed from the lever. Be careful because the set screw on mine had a thread lock compound on it, and I bent my allen wrench pretty bad trying to get the damned thing out. Not sure what size the allen wrench is but it tiny and was the smallest one in my kit. Brembo sell replacement kits that include new pivot pin, pusher pin, and new tiny set screw. I believe Norton stock these as they sent me one to repair my lever last year.