I really dont have any idea why would this woman do that to that semi truck. Brake checking a high speed semi is quite a dangerous thing. Well, this car driver .brA Bad Driver Brake Checks a Truck after overtaking. Luckily the Truck Driver has Dash Cam footage.brBuy the RoadCams Dashcam: ▻ Or subscribe for daily dashcam videos: This irresponsible driver brake-checks a semi .brBrake checking means hitting your brakes hard to scare or annoy the person that is driving behind you. Brake checking can have serious consequences as seen .