hey man ,
i just had the exact same problem , became so bad i almost had to put my foot through the floor!!! the pedal box is cracked and most likely wont last longer than a couple of months , i was freakin out too thinkin it was gonna be $600 - $700 ( as was quoted ) to fix , turns out its 3 bolts under the master cylinder and a bit of tetris action to remove ( and worse to get back in ) and a pin that runs through the box and the pedal , and boom drops straight out , a bit of welding and strengthening around the weak spots ( mine had 6 cracks and fractures ) , seriously took about 45 minutes of actual work!!!! think about it , so worth it !!!!
i payed the princely sum of.........NUTHING!!!!!!
feels like a button clutch should !!!!! beta than ever!!! STRONGER THAN NISMO ITEM!!!!
enjoy!!!