My horse, Coco, is confused or reluctant to brake when I ask for it. The most common scenerio is that (from a walk) I'll pull back and say, "Whoa." She'll usually take a few slow steps, but when I release the pressure as she slows, she'll just keep walking. Then, usually, the next time I ask her she'll stop.
She also has a hard time slowing down a speed, and it takes a few seconds for her to slow down from a trot to a walk. Going from a canter to a trot is even worse - I usually don't even canter her, because she gets out of control and I fall off.
Please, I need help with this. I've fallen off six times in the past year (all of them because I couldn't control her speed); one of the times I broke my arm, and another time I landed on my neck/head/shoulder area. One of these days... Not good.