When should a brake line be replaced?

A brake line should be replaced when it shows signs of corrosion or leaks because these issues can significantly compromise the effectiveness of the braking system. Brake lines are responsible for transporting brake fluid from the master cylinder to the brake calipers, and if they become corroded or develop leaks, the integrity of the brake system is at risk. Corrosion can weaken the metal, leading to potential failure, while leaks can result in a loss of brake fluid, causing diminished braking power and posing serious safety hazards. Regular inspection for these conditions is crucial for maintaining vehicle safety and performance.

While the other options may seem relevant, they do not address the most critical factors that directly affect the functionality and safety of the brake system. Looseness during inspection could indicate other underlying issues, and simply replacing a brake line based only on a mileage threshold or visible cracks does not account for the condition of the line as it operates under various conditions. Prioritizing signs of corrosion or leaks ensures a proactive approach to vehicle maintenance and safety.