I am assuming this problem started quickly and not gradually. If you look at the parts diagram at the brake pedal shaft (Item 4) you will notice 2 levers attached to the shaft. The slotted one at the distal end and another lever with 2 holes near the #65 on the diagram at the proximal end near the pedal. When you watch the video the slotted lever and it's attached rod (#53) is the primary interest; however, when you look at the proximal lever near #65 and the rod attached to it, you will notice that the bend in that rod causes it to hit the brake shaft (item 4) preventing the pedal from being pressed further. In turn, that prevents rod #53 from moving forward. I believe the bent rod attached to the lever (near #65) has been attached upside down. If you turn it over, the bend in the rod will allow you to push the pedal further down allowing rod #53 to be pulled further forward and applying more pressure on the brake. The diagram doesn't show the bent rod, so I am not sure it is upside down. Theory is based on the video. What do you think?