A locking bracket system for a pair of line replaceable modules (LRMs) includes a locking bracket assembly including an expanding member configured to be actuated to expand; and an extension bracket attached to the expanding member. The extension bracket extends from the expanding member in a direction opposite that the expanding member expands. Each of the expanding member and the extension bracket are configured to compress against a LRM to retain the pair of LRMs to a chassis when the expanding member is in an expanded position.