What are the main contents of the secondary maintenance for vehicles?

[MacFaith]

The purpose of secondary vehicle maintenance is primarily inspection and adjustment, with objectives and items as follows: Items: Replace engine oil and oil filter, check coolant level and quality, check power steering fluid level and quality, check brake fluid level and quality, replace the oil in the oil pan, and clean the oil pan, oil pump, and oil strainer with kerosene, inspect and adjust valve clearance, tighten cylinder head, intake and exhaust manifold, and muffler bolts. Objectives: Mainly to improve the working conditions of various components, reduce wear, eliminate hidden dangers, lower costs, avoid premature damage, and maintain the vehicle in good working condition.

[McCamilla]

When my Japanese car reached 40,000 kilometers for its secondary maintenance, the mechanic performed a comprehensive service package. Key procedures included: changing engine oil and filter as basic operations, plus cleaning/replacing the air filter. For the chassis: brake pad thickness measurement, suspension bushing inspection, tire rotation with dynamic balancing. Fluid checks involved professional equipment testing brake fluid moisture content and coolant freezing point. Headlight adjustment focused on high-beam height and projection angle, with handbrake travel adjustment. Finally, all chassis bolt torques were checked and tightened, plus AC filter dust removal. The entire process took about two hours, significantly more complex than the first maintenance.

[JasperFitz]

The second-level vehicle maintenance includes quite a few inspection items, with the core content roughly divided into three categories: For the engine system, it's essential to replace the engine oil and oil filter, along with inspecting the intake and exhaust systems. The chassis and running system focus on wheel alignment correction, tire pressure adjustment, brake disc and pad wear inspection, and steering linkage clearance check. In terms of safety configurations, it includes adjusting the brightness of all vehicle lights, testing the battery starting voltage, and inspecting the belt tension. Additionally, all fluid levels are checked, such as the brake fluid reservoir and coolant reservoir. I remember during last year's maintenance, the mechanic detected abnormal noise in my left front wheel bearing and replaced it in time, preventing a more significant failure.