Do brake pads always rust?
2 Answers
Brake pads can rust, and it is a normal phenomenon. Car brake pads are generally made of steel and are prone to rust in wet weather. Car brake pads, also known as brake linings, refer to the friction materials fixed on the brake drum or brake disc that rotates with the wheel. In the car's braking system, brake pads are the most critical safety components, so they play a decisive role in the braking effect. Methods to check the wear level of brake pads: Check the thickness: The thickness of the brake pads has a significant impact on the braking effect. Generally, new brake pads are about 1.5 cm thick. When the thickness wears down to about 0.3 cm, it's time to pay attention. Dashboard reminder: Many modern cars have a reminder system. If there is an issue with the brake pads, the brake warning light on the dashboard will illuminate, prompting the owner to check the brake pads promptly to see if they need replacement. Sound: Car brake pads are usually made of iron. If unusual noises occur during braking and persist for a long time, the owner should inspect the brake pads immediately. Braking effect: For experienced drivers, the wear level of the brake pads can be gauged by the braking effect. If the braking performance is poor during braking or if the brake pedal feels noticeably lower during emergency braking, it indicates that the brake pads are severely worn and need immediate replacement. Ways to protect brake pads: Avoid sudden braking: Emergency braking causes significant damage to brake pads. When driving normally, pay attention to braking gently or using intermittent braking to minimize wear on the brake pads. Reduce braking frequency: Develop a good habit of reducing braking while driving. Use engine braking to slow down the vehicle before applying the brakes for further deceleration or stopping. Downshifting can also help in slowing down the car. Timely wheel alignment: If the vehicle tends to pull to one side, perform a four-wheel alignment promptly to prevent tire damage and excessive wear on the brake pads on one side of the vehicle. Break-in period after replacing brake pads: For those who have just replaced new brake pads, note that the surface of new brake pads is smooth and requires a break-in period (usually 200 km) to achieve optimal braking performance. Therefore, avoid aggressive driving during this period.
As a seasoned driver with years of experience, I've noticed that brake pads often rust, especially when the car is parked outdoors for several days after rain. Brake discs are typically made of cast iron and are prone to rust when exposed to humid air, which is a normal oxidation process. Don't worry about rust affecting braking safety; just start the car and apply the brakes a few times, and the rust will wear off, restoring the system to normal. It's advisable not to leave the car idle for long periods; driving it once a week can reduce the risk of rust. In coastal areas with high humidity, rust occurs more frequently, but regular checks on brake wear are sufficient. Rust doesn't shorten the lifespan of brake pads unless there's severe corrosion or unusual noises, in which case repairs may be needed.
