The figure shows a 400mm diameter brake drum with four internally expanding shoes Each of the hinge pins A and B supports a pair of shoes The actuating mechanism is to be arranged to produce the same force F on each shoe The face width of the shoes is 75 mm The material used permits a coefficient of friction of 024 and a maximum pressure of 1000 kPa a) Determine the actuating force b) Estimate the brake capacity c) Noting that rotation may be in either direction, estimate the hingepin reactions