The US transport department says that it did not receive details about the brake flaws “in a timely way.”
The car manufacturer recalled 3.3 m vehicles because of this fault alone. It has made two others in relation to other faults.
Toyota began recalling vehicles in January and has been criticised for the length of time it took to make a public statement and deliver an apology. It has since launched a reassurance campaign.
The car manufacturer has two weeks to appeal against the fine.