What Causes Rusty Brake Pads to Make a Clicking Sound?
2 Answers
Brake pad noise may be caused by rust on the brake caliper, slow return of the brake master cylinder, the break-in period of a new car, foreign objects between the brake pads and brake disc, excessively hard brake pad material, improper installation of the brake system, or noise during reverse braking. Below is more detailed information: 1. Rust on the brake caliper: If brake fluid is not replaced for a long time, it can deteriorate, and the moisture in the fluid can cause the caliper to rust, leading to friction and noise. 2. Slow return of the brake master cylinder: Abnormal return of the brake caliper can also cause brake pad noise. 3. Break-in period of a new car: The brake pads and brake disc of a new car are in a brand-new state and still in the break-in period, which may produce some noise. This is a normal phenomenon. 4. Foreign objects between the brake pads and brake disc: During driving, foreign objects such as sand or gravel can get lodged between the brake pads and brake disc, causing noise when braking. 5. Excessively hard brake pad material: Most original brake pads are made of semi-metallic materials, which can easily produce noise when rubbing against the brake disc. 6. Improper installation of the brake system: If the spacing between the brake pads and brake disc or the tightness of the nuts is not properly adjusted during installation, it can cause noise. 7. Noise during reverse braking: Brakes primarily work during forward motion, so prolonged wear in one direction can create burrs on the reverse side. When braking in reverse, these burrs rub against the brake disc, producing noise.
I've been driving for over twenty years, and the issue of brake pads rusting and making clunking sounds is an old one. Usually, parking in damp places for too long leads to rust, especially after rain or in a humid garage. When rust spots form on the metal surface, uneven friction occurs when braking, resulting in that clicking noise. Over time, this can accelerate wear or even cause the brakes to seize, which is quite dangerous. I recommend parking in dry places regularly and taking a short drive once a week, gently applying the brakes to prevent rust. If the noise is already present, try braking softly a few times at low speeds—this often helps. If it gets serious, have it checked and replaced at a repair shop; don’t skimp on this expense. Safety comes first—this is what I’ve learned from my many experiences.
