"DANGER RIDE"! There was a "reallity" show on TV (maybe still is) about El Rey's Garage in Venice Beach and some "hillbilly hood rat" called Brothr JD who would drive some old hoopty home with sketchy brakes. He'd get going down a hill and shout "DANGER RIDE"! I took my old '59 Kurbside step van out after a long sit and headed down hill. Everything is down hill from the mountain I live on. Next thing I know I've got no brakes and the emergency brake (driveshaft type) isn't even slowing me up. All I could hear in my head is Brother JD yelling DANGER RIDE! I guess I better dump this single pot master cylinder and get a dual. This step van is on a Chevy 10,000 lb GVW with 19" wheels. Not sure what dual master cylinder I should be looking for.