Robledo is probably best known for his roles in Sergio Leone's Spaghetti Western films of the 1960s and 1970s, portraying minor characters in the trilogy of films A Fistful of Dollars (1964), For a Few Dollars More (1965), The Good, the Bad and the Ugly (1966), and Once Upon a Time in the West in 1968. He acted in many other westerns prolifically including the tortured sheriff in Four of the Apocalypse (1975).