DETROIT (AP) — U.S. safety regulators are investigating whether a recall of Ford F-150 pickup trucks for brake failures should be expanded to more model years.

The probe covers about 282,000 pickups with 3.5-liter six-cylinder engines from 2015 and 2016. The National Highway Traffic Safety Administration says it has received 25 complaints alleging sudden brake loss in the trucks. No injuries were reported.

In May, Ford recalled about 271,000 six-cylinder F-150s from 2013 and 2014 because brake fluid could leak from the master cylinder and cause brake failure.

The safety agency says it received 10 complaints about 2015 brake failures and another 15 about the 2016 models.

Investigators will decide if the 2015 and 2016 models should be added to the recall. The F-series pickup is the top-selling vehicle in the U.S.