The mechanism consists of two kinematic chains with links of equal lengths by means of which shoes 3 and 4, and 5 and 6, are applied to wheels 7 and 8. These chains are interconnected by link 9. When levers 1 and 2 are turned, the first clockwise and the second counterclockwise, shoes 3, 4, 5 and 6 are pressed against the rims of wheels 7 and 8, thereby braking the wheels.
$861$LW,Br$