You are not limited by the breaks only the tires friction which depends on weight. So in many cases, you can start to move if you don't have enough cargo and fuel on board.
PS: You really do need to tie down an F-15 to do a maximum engine thrust test. Edit: As I said "high preformance"
PS: You really do need to tie down an F-15 to do a maximum engine thrust test. Edit: As I said "high preformance"