NASCAR great Dale Earnhardt Jr. opens up about concussions, fears and why he put the brakes on his storied career.

Dale Earnhardt Jr. Opens Up About His NASCAR Career And Concussion Concerns

Dale Earnhardt Jr. enters his car for qualifying for the NASCAR Cup Series auto race in Brooklyn, Mich., Friday, Aug. 11, 2017. (AP Photo/Paul Sancya)

Dale Earnhardt Jr.

NASCAR great Dale Earnhardt Jr. opens up to Meghna Chakrabarti about concussions, fears and why he put the brakes on his storied career. We also hear from Michael Collins, who's treated Earnhardt Jr. for concussions since 2012.

NASCAR

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