Jimmy and Johnny Valiant signed with Vincent J. McMahon's World Wide Wrestling Federation (WWWF) in May 1974 and debuted there around soon after. Their biggest success as a tag team came when they defeated Tony Garea and Dean Ho to win the WWWF World Tag Team Championship on the May 8, 1974 edition of All Star Wrestling. The Valiants quickly became a dominant heel tag team as they went on to successfully defend their titles for over a year before losing them to Dominic DeNucci and Victor Rivera on May 13, 1975. This made the Valiant Brothers the longest reigning champions of their era with a reign of 370 days. The record was broken fourteen years later by Demolition (Ax and Smash), who reigned as tag team champions for 470 days. After losing the titles, the Valiants battled against the likes of Tony Garea, Dean Ho, Chief Jay Strongbow and Haystacks Calhoun.
In 1978, the Valiant Brothers returned to WWWF but Jimmy retired and was replaced by "brother" Jerry Valiant. Jerry and Johnny began wrestling in the tag team division while Jimmy became their manager. In March 1979, the promotion was renamed the World Wrestling Federation, dropping 'Wide' from the name. On the March 24, 1979 edition of Championship Wrestling, Jerry and Johnny defeated Larry Zbyszko and Tony Garea to win the WWF Tag Team Championship. This second version of the Valiant Brothers was also successful, but Jerry could not achieve the popularity which Jimmy had achieved.
On July 13, 1979, they retained the championship in a match against The Jaguar of Colombia and Tito Santana. Jerry and Johnny lost the titles to Ivan Putski and Tito Santana on October 22. After unsuccessful attempts in winning back the titles from Putski and Santana, the Valiant Brothers broke up in 1980, putting an end to the team.
Jimmy and Johnny were inducted into the WWE Hall of Fame class of 1996 by Owen Hart and "The British Bulldog" Davey Boy Smith.