Trophy 900 Front Brake Problem,

I'm no expert but when I remove the master cylinder cap and seal, then pump the clutch lever, you can see the fluid return as a jet through the small return hole at the bottom of the master cylinder when the lever is released. Is this happening?
I have read that sometimes the return hole can be blocked causing the clutch to slip.
BTW your post header talks about brake problems.

 

Typical reason for this problem is when the handlebar lever is prevented from fully returning home to the ‘at rest’ position and the port remains covered by the lip of the rubber seal preventing the fluid returning to the reservoir.