Why Does the Brake Squeak When Pressed?
2 Answers
The reasons for squeaking when pressing the brake include: 1. Issues with brake fluid—insufficient, deteriorated, air-contaminated, or long-unreplaced brake fluid can cause the problem; 2. Oil leakage at the brake cylinder or pipeline joints, resulting in an inexplicably increased brake pedal travel or the pedal not returning, leading to squeaking; 3. Air in the brake lines that needs to be bled; 4. Problems with the master brake cylinder; 5. For some models with rear drum brakes, excessive clearance between the brake shoes and the brake drum can also cause squeaking. Braking, also known as deceleration, refers to the action of stopping or reducing the speed of moving locomotives, vehicles, other transport tools, or machinery.
I usually drive to and from work, and I've encountered the situation where the brakes squeak several times. The sound is like a mouse screeching on the wheels, which is quite scary. It's mainly because the brake pads are worn too thin, and the metal components inside directly rub against the brake disc, producing a harsh noise, especially when slowing down to stop gradually. Another possible reason is excessive moisture from rain, causing the brake disc to rust. The squeaking may occur briefly when starting the car but then disappear, indicating rust particles sticking to the surface. Dust or small stones getting stuck in the brakes can also create noise and affect braking performance. I suggest that whenever you hear such sounds, don't delay—visit a repair shop to check the brake pad thickness. If they're too thin, replace them immediately. Safety comes first, or else the braking distance may increase, leading to accidents. I’ve learned this the hard way—I almost rear-ended someone once.
