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The curb chain applies pressure to the curb groove under a horse's chin when the curb rein of the bit is used. When the curb rein is pulled, the shank of the bit rotates back towards the chest of the horse and the cheek (upper shank) of the bit rotates forward (since it is a lever arm).f used with a loose curb chain, it allows the shanks to rotate more before the curb chain is tight enough to act as a fulcrum and exert pressure. This extra rotation can warn the horse before pressure is exerted on his mouth, so he may respond beforehand.
The horse should now start to bend to the pressure of the rein, at which point you can begin to move your arm down to your thigh near your knee. The horse should bend at this point until there is slack in the rein and stop. If the horse doesn't stop at this point, push firmly with your stabilizing hand and wait.