The most common cause of heavy steering is a failure in the power steering system, particularly insufficient or deteriorated power steering fluid in hydraulic systems, or malfunctioning sensors/motors in electric power steering systems. Additionally, underinflated tyres significantly increase rolling resistance, raising steering load by approximately 30% - always maintain tyre pressure at the manufacturer's recommended level (typically 200-250 kPa). Other contributing factors include: insufficient lubrication of tie rod ends, four-wheel alignment deviations (such as toe angles exceeding 0.5 degrees), or worn suspension components - all of which alter steering geometry and require professional diagnosis and adjustment. Notably, power steering fluid unchanged beyond 2 years or 40,000 km oxidizes into sludge that can clog hydraulic circuits; regular fluid inspections during maintenance are recommended. Should steering suddenly become heavy with unusual noises, immediately cease operation for service to prevent complete steering system failure and potential safety hazards.
