text: A second possible factor to control braking 
  effectiveness is the distribution of normal force 
  to the landing gear surfaces. The nose wheel 
  of the tricycle landing gear configuration usu- 
  ally has no brakes and any normal force dis- 
  tributed to this wheel is useful only for pro- 
  ducing side force for control of the airplane. 
  Under conditions of deceleration, the nose- 
  down pitching moment created by the friction 
  force and the inertia force tends to transfer 
  a significant amount of normal force to nose 
  is unavailable to assist in 
  wheel where it 
  force. For the instant after 
  creating friction 
  landing touchdown, 
  the pilot may control 
  this condition to some extent and regain or 
  increase the normal force on the main wheels. 
  After touchdown, the nose is lowered until the 
  nose wheel contacts the runway then brakes 
  are applied while the stick is eased back with- 
  out lifting the nose wheel back off the runway. 
  The effect is to minimize the normal force on 
  the nose wheel and increase the normal force 
  on braking surfaces. While 
  the principal 
  effect is to transfer normal force to the main 
  wheels, there may be a significant increase in 
  normal force due to a reduction in net lift, i.e., 
  tail download is noticeable. This reduction 
  in net lift 
  tends to be particular to tailless or 
  short coupled airplane configurations. 