Drum brake assemblies including drums, hubs and adapters, drum-in-hat parking brakes, disc brake systems including single piston calipers, solid cast rotors, conventional parking brakes, brake proportioning valves, two- and four-wheel anti-lock braking systems, conventional master cylinders and brake boosters, power assisted rack and pinion steering systems, seat belt assemblies, seat belt pretensioners, frontal airbag systems and crash sensors with single-stage inflators Traction control systems, dynamic rear brake proportioning, electronic brake actuation, electronic and mechanical brake assist, high-performance brake calipers, panic brake assist, ventilated rotors, speed proportional rack and pinion steering, electrohydraulic steering, seat-integrated restraint systems, integrated child restraint systems, seat belt height adjusters, seat belt retractors with energy management devices, complete vehicle occupant restraint system including side impact airbags with thorax and head chambers, head curtains, side impact crash sensors, enhanced airbag electronic control units, diagnostic modules and airbag disable systems, integrated steering wheel and airbag covers, depowered airbags, passenger-side heated gas inflator Vehicle control system enhancements including electronic stability control, hill hold, automatic brake preconditioning, automatic emergency braking, trailer brake stabilization and active rollover mitigation, electromechanical braking, brake-by-wire, integrated braking and steering systems, electrically powered steering, steer-by-wire systems, active and semi-active suspension systems including anti-roll systems, driver assist systems including lane departure warning and lane keeping systems, follow-to-stop and stop-and-go adaptive cruise control, switchable level retractor pretensioners, declining and progressive energy management seat belt systems, dual-stage inflators, cold gas inflators, rollover curtain airbags with up to three rows of occupant protection, vehicle rollover sensors, knee bolster airbags, occupant classification weight-based and vision-based systems, direct and indirect tire pressure monitoring