Взято из тех. описания тягача Freightliner, коммерческое предложение на продажу. Нет ясности именно с этим: 50% Plus Side on Tires & Brakes.
Буду очень благодарна за соответствующие разъяснения.

The DOT is the Department of Transportation here in the United States of America. They have certain safety and mecahnical condition requirements that trucks must meet before they can be legally used here.

"50% plus side on tires and brakes" means that there is still more than 50% tread on the tires and that the brakes shoes still have more than 50% left on their pads.