On 2 July 2022, I was traveling southbound on Interstate 95 in a rented 2021 Nissan Sentra. While DRIVING the brakes unexpectedly LOCKED and did NOT release, affecting the steering, and causing the vehicle to spin out in a circle across major highway lanes crashing head on into a guardrail on the left side of the interstate. This is a MAJOR SAFETY concern as when an individual is DRIVING a vehicle, they need to be able to control NOT ONLY the direction of the vehicle, but when that vehicle brakes. When the brakes LOCKED while DRIVING, so did the steering, causing there to be NO CONTROL of a vehicle traveling down a major Florida interstate. Had there been impact by another vehicle while the 2021 NissanSentra brake malfunction caused it to spin out across major highway lanes, such would have been fatal to both me & the unexpected driver also traveling southbound on I95. If this malfunction exists in other 2021 Nissan Sentras, a MAJOR motor vehicle safety risk also exists for both drivers & riders of the 2021 Nissan Sentra, as well as any other motorist driver traveling with passengers in the same direction. This vehicle was a rental car through Budget and is NOT personally owned.Rental company was informed of mechanical malfunction & also aware that the brakes LOCKED while driving the 2021 Nissan Sentra. Service history/ maintenance of rental vehicle is personally unknown. It is also unknown if the problem / component has been inspected by dealer or independent s