sounds like you need to adjust the idle screw

take you air filter off and look down the hole you should see a cylinder and a tiny gap
make that gap 1mm(I usually have to go 1.5) and tighten the screw so the gap won't go under that when the brake is applied.
Try it out. If it still dies make the gap a tiny bit bigger
lock tight the screw (with blue lock tight) so it don't come loose and back out once you get it set.