Braking torque on the drum of shoe brake is given by
1
(Normal reaction on the block) × (radius of drum)
2
(Frictional force on the block) × (radius of drum)
3
(Force applied at the level end) × (radius of drum)
4
2 × (Force applied at the level end) × (radius of drum)
5
\(\frac {(Force~ applied ~at ~the~ level ~end) × (radius~ of ~drum)}{2}\)