Brad Keselowski’s No. 6 Ford failed post-race inspection Sunday night at Martinsville Speedway, and the veteran driver was dropped from fourth place to last in the finish order of the 500-lap NASCAR Cup Series playoff race.
NASCAR said Keselowski’s car failed to meet minimum weight requirements as outlined in section 14.11.2 of the rule book.
The fourth-place finish would have been Keselowski’s best of the season. He finished fifth last week at Homestead-Miami Speedway.
Keselowski is in his first season as a co-owner of Roush Fenway Keselowski Racing.