HP brake lever - can't move the knob

[bmwbadboy]

I can't move the red knob on brake level past 2nd mark. The only way is to force it with the hammer, but then the wind pushes it back to 1/2nd mark.

Is the lever dead or is there a trick to make it work again ?

 

[vro551]

wd40 should help, happened to me too