How to Determine When Brake Discs Need Replacement?

[DiJohn]

There are two main methods to determine if your brake discs need replacement: 1. Check the brake pad thickness: Most brake discs have wear indicators, which are three small dimples distributed on the disc surface. Use a caliper to measure the depth of these dimples; when it reaches 1.5mm (meaning the total wear depth on both sides of the disc is 3mm), the brake discs should be replaced promptly. 2. Listen for sounds: If you hear a metallic scraping or squealing noise when lightly applying the brakes, the brake pads must be replaced immediately. This noise indicates that the wear indicators on both sides of the brake pads are directly grinding against the brake disc, meaning the pads have exceeded their limit. In such cases, while replacing the brake pads, you should also inspect the brake discs. Often, the discs are already damaged when this noise occurs, and simply replacing the pads won’t stop the noise. In severe cases, the brake discs may also need replacement.