Sherco had (or still have not sure) different levers from others with same model master cylinder.
The pivot point in sherco give more leverage than others. So the lever should be specific for sherco's
Try it.
If you feel like your socket will strip the hex, tri with another socket (the ones six sided are better than these star shaped. And you can grind the chamfrer off to have more contact area)
You will need to disasembly in this order:
Front brake, front wheel, forks and then triple clamps.
Then, press stem out bottom triple clamp. The one I removed took 6tons.
Good time to put new bearings.