What causes the squeaking sound when braking in the Excelle?
2 Answers
Rust or dirt on the brake discs or brake pads can cause noise. After prolonged parking, especially in humid climates or after rain, rust or debris may form on the brake discs or pads, leading to unusual sounds. Below is relevant information: 1. Concept: The brake disc is essentially a round disc that rotates as the vehicle moves. The brake caliper clamps the brake disc to generate braking force; when you press the brake, it clamps the disc to slow down or stop the vehicle. Brake discs offer effective braking performance and are easier to maintain than drum brakes. 2. Function: The brake disc and pads are crucial for braking, with the braking force originating from the caliper. Typically, standard calipers have a fixed inner section housing the piston pump, while the outer part features a clamp-like structure. The inner brake pad is fixed to the piston pump, and the outer pad is secured to the caliper's exterior. The piston, driven by hydraulic pressure from the brake fluid, pushes the inner pad while simultaneously pulling the caliper via reaction force, causing the outer pad to press inward. Both pads then clamp the brake disc, generating braking force through friction between the disc and pads. In this process, the piston is actuated by brake fluid (hydraulic oil), which also assists the engine. For the handbrake, a cable mechanism uses a lever structure to forcibly pull the brake pads against the disc, creating braking force.
I've been driving for over a decade and have seen plenty of cases where the Buick Excelle's brakes squeak. Usually, it's a minor issue that's not a big deal, but it should be addressed promptly. The most common cause is worn-out brake pads, where the small warning tab contacts the brake disc, producing a sharp sound. Alternatively, dust or sand particles might get stuck in the brake gaps, causing a squeak every time you brake. Newly replaced brake pads may also produce some noise during the initial break-in period, but this should disappear after a day or two of driving. Additionally, if the brake disc has scratches or isn't smooth, friction can cause noise. If the noise occurs after rain, pressing the brakes a few times can usually wear off the rust. Don't underestimate it—it's best to check the remaining thickness of the brake pads yourself. If they're too thin, head to a repair shop for replacements. Regular inspections can save you a lot of money in the long run.
