I teach to always test the brakes - lightly - immediately after the nosewheel is placed on the runway. Better to discover the problem with maximum runway left in front.
Also, when braking is commenced, to use the brakes a little more firmly than seems necessary. Not to the point of skidding, nose diving etc, but it's better to find that you didn't actually need all the braking power that was used, than to discover at the end of the runway you should have used more when it there, just waiting to be used...
I suppose the 'correct' amount of braking I try to teach is one where a relaxation of brakes is necessary to avoid stopping just short of the chosen taxiway etc.
[This message has been edited by Tinstaafl (edited 05 December 1999).]