Does a brake pad thickness of 4mm require replacement?

[DelAlivia]

Normally, brake pads need replacement when they are less than 3mm thick. Here are some self-inspection methods for brake pads: 1. Check the thickness: Measure the thickness of the brake pads. A new brake pad is approximately 1.5cm thick, and its wear limit is 0.3cm. When the brake pad thickness is below the wear limit, the metal backing plate will come into contact with the brake disc, producing a metallic friction noise. Therefore, if you hear such noise when braking, you should first check the brake pads. 2. Feel the change in braking force: Pay attention to the change in braking force when applying the brakes. If braking feels more strenuous than usual, or if the brakes are less responsive, or if the brake pedal position feels lower during emergency braking with a longer pedal travel, then the brake pads should be inspected as soon as possible. 3. Observe the warning light: If the brake pad wear warning light on the dashboard comes on, it indicates that the brake pads need to be inspected and replaced.