Ok, it Windex doesn't damage brakes...?

Why do my brakes GRIND real loud and the Reverse and Drive aren't changing smoothly right after I finished washing my car. I only used car shampoo on the outside and a little Windex on the wheels. Nothing else. It's my first car and the first time I've washed it. Am I supposed to let it dry first? Plus the brakes are REALLY JERKY. Not smooth like before... Any one know?