What Causes the Squeaking Sound When Braking and Turning the Steering Wheel?

[Malcolm]

If there is a slight squeaking sound at the pedal position when lightly pressing the brake while the vehicle is stationary, it is mostly due to the return spring of the brake light switch on the brake pedal. If there is a noticeable squeaking sound when braking at low speeds, it could be coming from the brake disc area. Many new cars or those with recently replaced brake pads often experience such braking noise issues while driving. Common faults related to braking noise (external to the vehicle) during driving are as follows: 1. For new cars or those with recently replaced brake pads, if the brakes repeatedly produce a sharp screeching sound, it is mostly because the brake disc has developed a mirror-like surface after use. At this point, friction between the brake pad surface and the mirror-like brake disc can create a hardened layer. This hardened layer rubbing against the mirror-like brake disc tends to produce a screeching sound. If only the brake pads are simply ground down to remove the hardened layer, the noise may stop temporarily, but if the brake disc remains smooth, the hardened layer will quickly reform on the brake pad surface, causing the noise to return. 2. To effectively resolve this issue, you can use a specialized lathe to resurface the brake disc or grind it with sandpaper or a grinding wheel. Alternatively, creating X-shaped grooves on the brake pads or using specially designed perforated brake discs can help. The latter two methods are more effective but may reduce the lifespan of the brake pads. If the brake disc is deformed, causing it to wobble and rub against the brake pads while driving, resurfacing the brake disc to correct the out-of-round condition can solve the problem. If the brake disc surface is rusty, the noise occurs when the brake pads scrape off the rust spots. Typically, the noise will disappear after a few minutes of driving or by performing two high-speed emergency brakes.