Top left transistor is #1
Top right transistor is #2
Bottom right transistor is #3
Bottom left transistor is #4
Or just start at top left and work clockwise.
If 1 and 3 are enabled then you get forward rotation
If 2 and 4 are enabled you get reverse rotation
If 3 and 4 are enabled you get brakes
If 1 and 2 are enabled you get light braking.
If there is anything that would make this work better please let me know, I'm noticing when I increase the load level it slows down way more than it should because the voltage drop across the motor is lower.