Joaquin Phoenix's car overturned on a canyon road and collided with another vehicle after his brakes went out, but there were no reports of injury, police said.
Phoenix lost control of his car, which overturned and hit another vehicle also headed eastbound, Lee said.
Phoenix, the 31-year-old star of the Johnny Cash biopic "Walk the Line," was driving eastbound above Sunset Strip about 2:50 p.m. when he realized his brakes were not working, said Officer Jason Lee, a police spokesman.
Phoenix lost control of his car, which overturned and hit another vehicle also headed eastbound, Lee said.
His publicist, Susan Patricola, said in a statement that Phoenix was wearing his seat belt and walked away from the scene after being helped out of his vehicle by a passer-by.