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Daimler's Mercedes Benz brand is recalling M-Class SUVs built between 2000 and 2004, the US National Highway Traffic Safety Administration said.
The NHTSA said on its website that "Mercedes Benz has determined that under certain circumstances use of the brake pedal may not automatically disengage cruise control as expected by the driver," but that other ways of switching it off remained in effect.
The risk of a crash increased when the cruise control mechanism cannot be disengaged, the agency noted.
Mercedes would repair the fault free of charge, the NHTSA said.