What would cause my power steering fluid to foam up and leak back out through the fill cap? The car got hard to turn one night so i checked the fluid, it was really low. I looked down in the fill hole and I could hear and see it, it was all bubbly and foamy. I filled it back up and it seemed alright until the next day I lost power steering again. When I started the car it was all bubbled foam and coming up through the fill cap and leaking all over. Any clue what could be causing this?