181.1. A non-railbound motorized vehicle shall:(1) have service brakes capable of stopping the vehicle and keeping it stationary when it carries the maximum load for which it was designed on the steepest slope on which it may be required to travel;
(2) have a parking brake that:(a) is mechanically operated;
(b) is capable of keeping the vehicle stationary when loaded;i. on a slope of 15% in the case of a vehicle used on the surface;
ii. on a slope of 20% in the case of a vehicle used underground;
(c) when applied, is capable of maintaining its power despite contraction of the brake parts, depletion of the power source, or any leakage.
For the purposes of this section, “service brakes” means any type of main system used to stop a vehicle and keep it stationary without the assistance of any deceleration device or dynamic braking.