Driving without a brake

My dad and me went to a parking lot with my Brushless LST which has mech brakes. First I drove a round in the parking lot (I didn't use the brake) Then I let my Dad drive, he was trying to do cool by going 50% speed towards me and then brake so it'll make a stoppie in front of my feet. Well, because some screw got loose from the servo it didn't brake at all! I had to jump to the side, I was a bit scared once the LST passed me. I thought wtf is my dad doing that idiot... (That thing weights 7 kilo btw...)

Anyway, nothing happened except I had to tighten the screw on the servo again