By then you've left it too late. The two notches of brake may restrict rudder travel slightly, but when on the ground, increases the yawing moment that you can apply to the aircraft and hence increases the control authority.
No, you haven't left it too late. Your finger is around the lever and you can apply it at any time - and still get the increased yawing advantage. It goes like this:
Land, with brakes fully off. Once the tail is down, throttle closed, and the stick hard back, the left hand drops a few inches and the little finger is round the brake lever. You have unencumbered footwork to keep it straight. But, if you feel it going, despite full opposite rudder, you pull back gently with your left hand and you get instant smooth approriate brake which you can increase and decrease at leasure while holding full rudder.
That has to be better than restricted rudder movement, followed by a brake application you can't reduce without also reducing rudder.
With practice, you can also taxi without brakes, saving brake wear. Just use judicious pulls on the brake lever to augment rudder for tightish turns or turns against the weathercocking effect.
SSD