Child seat maker Britax has issued a recall for more than 31,000 Frontier™ child restraints that could fail to properly secure young passengers in the event of a vehicle crash. The recall, issued through the National Highway Transportation Safety Administration, indicates that harness straps may detach from the metal yoke on the back of the child restraint if repeatedly loosened one strap at a time. The affected models include Britax Frontier™ models E9L54E7, E9L54H6, E9L54H7, E9L54M6 manufactured on or before September 14, 2008, and model E9L5490 manufactured on or before September 17, 2008. Britax will mail rubber caps that prevent the straps from detaching to all registered owners.