Was driving in traffic and when the cars were coming to a stop I was putting my foot on the break to prepare for a stop but it kept creeping forward and Iâm pushing down the breaks as hard as I could but nothing. It ended up hitting the big rig in front of me. The mode of my breaks is on hold itâs always been on hold I even tried to push the parking button but it would not budge, continued forward the collision stopped the car