During practice for the 24 hours of LeMans, the car of Mario Andretti and Lucien Bianci had the fastest trap speed on the Mulsanne straight - 343kph. During the race they were running a solid second the the #1 team car of AJ Foyt and Dan Gurney. 13 hours into the race Bianci pitted complainign of brake issues. Andretti got in and promptly crashed in one of the biggest accidents of his career, breaking three ribs. Bianci's observations proved correct as it was later discovered the brakes were installed back to front.