In Truck/Tractor-trailer brakes and accident reconstruction,
equipment and machinery expert witness Robert R. Reed writes on ABS anti-lock brakes:
Compatibility is also an issue as older trucks pull newer trailers and newer trucks pull older trailers. This creates different issues for reconstruction. Load conditions, total weight, weather, environment, road and tire conditions, brake system maintenance, adjustment, capacity and capabilities must also be considered. These issues can produce conflicting data, cloud issues and render unfair judgments on the drivers/vehicles involved. Remember that since March 1999 trucks and buses with hydraulic brakes are ABS equipped and trucks with air brakes have ABS after March 1997 and air brake trailers have ABS after March 1, 1998. These are manufacture dates of the vehicles. Analyze all data carefully, identify systems properly to understand actions of the vehicles involved in the crash.