I did not test this method now, I saw it at various teams in the last competition at Weston super Mare. More about this method I will write in near future. A nappies is a stripe of mesh that is attached between bridle and flying line. The kite is slower and the pull is reduced. If you fly tricks the nappies can be tangled with the kite.
Vents are pieces of mesh in the kite sail.
This reduces the sail area which in- turn reduces speed and pull. This is relative to position and size of the mesh. Cut two triangle shaped pieces of mesh that will fit into the place where the brakes should be fixed. If you want to attach them between cross and standoffs, side A has the length of the standoffs, B is the length from cross to the standoffs at attachment at the spreader. If you fix the brakes between standoff and tail, B is the length from standoffs to the split cap on the tail.