The U.S. National Highway Traffic Safety Administration has opened a probe into the brake effectiveness for the Mazda CX-9 large crossover vehicles released for the 2010 and 2011 model years.

Approximately 62,319 vehicles are affected by the recall, according to Reuters.

The NHTSA opened the probe after receiving seven consumer complaints of unexpected loss of power assisted braking.

A preliminary evaluation is the first step in a process that could lead to a recall if regulators determine a manufacturer needs to address a safety problem.

Most of the incidents claimed the brake pedal started feeling hard and required an "increased effort to stop the vehicle," according to the NHTSA.

Back in April 2012, the NHTSA investigated brake master cylinder leaks in the 2008-model CX-9 but closed that probe due to a low probability the issue could affect brake performance, according to the NHTSA.

Mazda has not released a statement regarding the probe yet.

Several people who have filed complaints reported hearing a hissing sounds during brake, according to the NHTSA.

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