I dunno that actually could help.Just like knowing how to control a wheelie for when it happens when you don't want it to or it won't when you need it to.;)
At least your son's 99 YZ125's front brake works good. My 98's couldn't do a stoppie if I tried. Maybe it has something to do with all the fork oil that has been leaking on it!!! I need to get some new pads I think. On second hand I go over the bars enough without an awesome front brake. I better not push my luck!!!