How can you determine if your brake rotors need to be replaced?

Measuring the brake rotors with a micrometer is the most accurate method for determining whether they need to be replaced. This method involves checking the thickness of the rotors against the manufacturer's minimum thickness specifications. Brake rotors wear down over time due to friction and heat generated during braking. If they fall below the minimum thickness, their structural integrity is compromised, which can lead to decreased braking performance and increased risk of brake failure.

While visual inspections for cracks can offer some information about the condition of the rotors, they do not provide a definitive measure of thickness and wear. Tapping the rotors to listen for sounds is not a reliable method, as it does not assess the wear accurately. Checking the color of the rotors can be influenced by factors like heat cycles and does not correlate directly to their structural integrity or ability to function effectively. Therefore, using a micrometer to measure the rotor thickness provides the most reliable assessment for determining whether replacement is necessary.