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Multiple methods can be used to comprehensively assess whether brake pads are worn. New brake pads typically have a thickness of 10-15 millimeters and need to be replaced immediately when worn down to 3-5 millimeters. Some vehicle models are equipped with wear indicators on the brake pads, and when the pad approaches the indicator position, it signals the need for replacement. Audibly, if a sharp metallic grinding noise occurs during braking, it may be due to excessive wear causing the friction material to come into direct contact with the brake disc. In terms of driving feel, a longer brake pedal travel or the need to press the pedal deeper to achieve the desired braking effect also indicates severe wear. The brake warning light on the dashboard of some vehicles will illuminate, which is a clear replacement signal from the electronic monitoring system. Additionally, professional maintenance personnel can further confirm the condition by inspecting brake disc wear marks, caliper operating status, etc. It is worth noting that urban congested road conditions or aggressive driving habits can accelerate wear. It is recommended to inspect the brake pads every 30,000 kilometers or at least every 6 months. If measured with simple tools, the brake pads must be replaced within 48 hours if their thickness drops below 3 millimeters to ensure safety. There are differences in wear rates between front and rear brake pads of different vehicle models, with the front ones usually wearing faster. Regular comprehensive inspections can effectively prevent risks caused by decreased braking performance.

To determine whether brake pads need replacement, a comprehensive assessment of wear level, driving experience, and vehicle prompts is required. New brake pads are approximately 1.5 centimeters thick; they should be replaced immediately when worn down to 5 millimeters or one-third of their original thickness. Some vehicle models have metal limit markers embedded in the friction material, and replacement is also necessary when the wear reaches the level where it is flush with these markers. If a sharp metal scraping sound ("metal-on-metal" noise) is heard while driving, it indicates that the brake pads have worn to the limit and are damaging the brake disc. A softened braking feel, longer pedal travel, or reduced emergency braking effectiveness all suggest insufficient friction material. The brake warning light on the dashboard of some models will illuminate, which is a direct prompt from the sensor detecting excessive wear. Replacement intervals vary significantly depending on driving habits and road conditions: front brake pads typically need replacement every 30,000 to 50,000 kilometers, while rear brake pads last about 60,000 to 100,000 kilometers. However, frequent hard braking, mountain road driving, or humid environments can shorten their lifespan. It is recommended to check the thickness every 5,000 kilometers; even if the mileage has not been reached, if they have not been replaced for more than 3 years, they should be removed and inspected to avoid rubber aging affecting braking safety. Poor-quality brake pads can accelerate brake disc wear, so it is advisable to use original equipment manufacturer (OEM) or certified brand products to ensure braking performance.

The replacement interval for brake pads typically ranges between 25,000 and 60,000 kilometers, depending on driving habits, road conditions, and vehicle type. In urban driving, front brake pads—subjected to greater pressure—may require replacement at 60,000-70,000 kilometers, whereas rear brake pads can last approximately 100,000 kilometers. Automatic transmission vehicles experience faster brake pad wear due to frequent gear changes, while manual transmission vehicles exhibit relatively slower wear. Replacement is advised when brake pad thickness falls below 2 millimeters, which can be determined by tire removal inspection or detecting sharp noises during braking. Aggressive braking and challenging road conditions accelerate wear; therefore, inspections every 5,000 kilometers are recommended to ensure driving safety.

The replacement timing of brake pads mainly depends on their remaining thickness. New brake pads typically measure between 10mm and 15mm in thickness, with specific values varying by vehicle model and material. When worn down to 1/3 of the original thickness (approximately 3mm to 5mm), inspection frequency should be increased. Immediate replacement is mandatory when the thickness reaches the critical limit of 3mm, as failure to do so may result in brake failure or damage to the brake disc. Certain vehicle models feature a wear warning system that activates a dashboard alert when the thickness falls below the safety threshold. Routine thickness assessment can be performed through visual inspection of wheel hub clearance, observation of the metal wear indicator (approximately 3mm thick), or caliper measurement. Symptoms such as abnormal braking noise (characterized by sharp metallic scraping), stiff pedal feel, or noticeably extended stopping distance also indicate replacement necessity. Professional inspection by technicians is recommended every 5,000 kilometers or during scheduled maintenance, with particular attention to front brake pads which experience accelerated wear due to greater load. Post-replacement, multiple brake applications are required to eliminate clearance between new pads and discs, ensuring optimal braking performance. A conservative approach recommends proactive replacement when thickness approaches 4mm, with maintenance intervals reduced by 30% for urban stop-and-go traffic conditions. Prompt replacement not only ensures driving safety but also prevents escalated repair costs from excessive wear.

The replacement interval for brake pads should be determined based on driving habits, road conditions, and vehicle type. Typically, front brake pads require replacement every 30,000 to 50,000 kilometers, while rear brake pads need replacement every 60,000 to 100,000 kilometers. Front-wheel drive vehicles experience greater braking loads, causing front brake pads to wear faster. Frequent stop-and-go city driving or aggressive driving can reduce the replacement interval to 20,000 to 30,000 kilometers. It is recommended to inspect brake pad thickness every 5,000 kilometers. Immediate replacement is necessary when the remaining thickness falls below 5 millimeters (approximately one-third of the original thickness), when metal grinding noises are heard, or when decreased braking performance is detected. High-performance vehicles or heavy-duty trucks have higher braking demands, resulting in accelerated wear, whereas ceramic brake pads can last 60,000 to 80,000 kilometers. Some vehicle models feature wear sensors that activate dashboard warning lights to indicate replacement. When replacing, always use OEM-specification parts and complete a 200-kilometer break-in period while avoiding harsh braking. Regular brake system maintenance and adopting smooth driving techniques can significantly extend brake pad service life.