What Causes Squeaking When Braking Lightly but Not When Braking Hard?

[AdrielLee]

Light braking causing a squeaking sound is generally due to the friction between the metal hard spots on the surface of the brake pads and the brake disc. This does not adversely affect braking performance and can be used with confidence. Additional Information: Cause: All cars can have such noise, which is due to the brake pads being new. The surface of the brake pads is still relatively rough, and it will improve after some use. If you want an immediate solution, find a deserted place and stomp on the brakes a few times. Newly replaced brake pads can also produce such sounds. Solution: You can try to grind off the carbides on the surface of the brake pads. If the noise persists and the brake pads are newly replaced, it might be due to a mismatch between the disc and the pads causing the braking noise. If the vehicle has a high mileage, the edges of the brake disc might develop a 'step', and this 'step' can also cause noise when rubbing against the brake pads.

[PenelopeLynn]

This situation where the brakes squeak when lightly pressed but don't make noise when pressed harder is actually quite common. From my personal car usage experience, it's mainly caused by small stones or dust stuck on the brake pads, or when the brake pads wear down to their limit, the metal indicator starts contacting the brake disc and making noise. If left unattended, dust will continue to accumulate, leading to reduced braking effectiveness and even accelerating wear on both the disc and pads, which will cost more to replace later. I recommend first simply checking the thickness of the brake pads - if it's less than 3mm, they should be replaced. Alternatively, take it to a repair shop for a thorough cleaning of the components to prevent increasing safety hazards. Parking on muddy ground should also be avoided in daily use to prevent such issues.

[VonIker]

I had the same issue when I was a new driver. Light braking caused annoying noises, but pressing harder made them disappear. Upon reflection, it was a brake system problem—either the newly replaced brake pads weren't properly bedded in or debris was stuck on old pads. That time, I visited a repair shop, and the mechanic fixed it by blowing away the debris with an air gun. Ignoring it could lead to overheating or reduced braking responsiveness, compromising driving safety. Now, I've made it a habit to check my brakes monthly to ensure no abnormal noises. A little time spent can save a lot of trouble.

[Mariana]

I've experienced this issue too. Light braking causes squeaking while heavy braking is quiet. It's likely the brake pad wear indicator is working, or uneven brake disc surfaces have accumulated dust causing friction noise. If this persists without timely handling, it may accelerate brake disc damage and even lead to longer braking distances. I believe safety comes first, so whenever I encounter this, I immediately check the brake pad condition - replace them if they're too thin or abnormal. I also take the opportunity to clean the brake system to avoid long-term hidden dangers affecting driving confidence.