Towed truck rolls downhill after cable snaps - GIF

[NeiljohnUK]

Cab too dark to see operator but towing with cable would require a steering wheel holder. My opinion: All of the brakes are out of adjustment except the right front on the tractor as evidenced by skid mark on pavement.

Working in the braking system supply industry back 40 years ago the local TIP rental depot (truck trailers) needed shoes relined weekly if not daily, on the low bed swan necks especially so, they did an audit on who had rented the trailers and it was one company that seemed to be wearing those particular trailers brakes out, it turned out they had wound off the tractor units rear axles brakes to save wear and money, relying purely on the trailers brakes and the tractors front axle brakes.

In this case it may have been the tractors rear axle brakes were wound off/worn out , and due to some other failure the trailer brakes had been wound off too...