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Extended PM Intervals Drive Hidden Costs in Brake and Seal Failures

Fleet operators extending preventive maintenance intervals to reduce costs face unexpected consequences in roadside violations and component failures, according to FMCSA inspection data. A 100-truck fleet shifting PM services from 15,000 miles to 25,000 miles annually saves approximately $120,000 to $200,000 in maintenance spending. However, FMCSA inspection data reveals carriers with extended intervals experience concentrated brake adjustment and hub seal violations. Brake components operating in mountainous terrain wear faster than those on flat highways, requiring interval adjustments based on operating environment. Hub seals failing at 23,000 miles would have been detected at 15,000-mile services. Fleets applying single maintenance intervals across all equipment regardless of route, terrain, or load profile report higher violation clusters on vehicles operating under severe duty cycles. The cost of roadside repairs and out-of-service violations often exceeds annual maintenance savings.