What Causes the Squeaking Sound When Releasing the Brake?

[MaverickFitz]

The reasons for the squeaking sound when releasing the brake are as follows: Running-in of a new car: The running-in of the brake pads is a crucial part, and it usually takes a few hundred kilometers of driving before the brakes feel more comfortable. Presence of sand particles: Tiny sand particles may get between the brake pads and the disc during driving, sometimes causing abnormal noises due to friction. This situation generally does not require repair; simply driving for a while to let the small sand particles fall out is sufficient. Damaged screws: Missing or damaged fixing screws of the brake disc can also cause abnormal brake noises. System malfunction: If there is a malfunction in the brake system, it needs to be checked and repaired.

[LaMaria]

Recently I noticed a 'creaking' sound when releasing the brakes in my car, which is actually quite a common issue. It's mainly caused by friction noise between the brake pads and discs. If the car sits overnight after rain, the brake disc surface tends to rust, and you'll hear metal grinding against the rust layer when releasing the brakes in the morning. Other causes include accumulated brake dust in the calipers, or when the brake pads wear down to their limit and the metal backing plate rubs against the edge of the brake disc, producing sharp noises. I usually first check the brake pad thickness - if it's below 3mm, it's time for replacement. If the pads still have sufficient thickness, I use a high-pressure washer to clean the brake discs and remove dust buildup, which typically eliminates the noise after a test drive. If the sound persists, it's necessary to remove the wheels and check if the caliper guide pins need lubrication grease - this job is best left to professional mechanics.

[VanGianna]

Yesterday, my car made a squeaking noise as soon as I released the brake, so I specifically looked into the cause. I found that it might be due to step-like protrusions worn on the edges of the brake discs, causing the edges of the brake pads to rub and make noise. It could also be that the caliper guide pins are stuck, preventing the brake pads from fully retracting. Additionally, if the car was just washed or in humid weather, rust on the disc surface can also cause a squeak when rubbed. I'm used to doing things myself, so I took off the wheels to inspect, first sanding down the burrs on the edges of the brake discs with sandpaper, then applying some special grease to the caliper pins (remember not to use regular grease), and cleaning off the brake pad dust. If the pads are too thin, replace the whole set. Usually, don't leave the handbrake on for too long when parked, and if on a slope, put it in gear to prevent rolling, which can reduce the chance of brake noise.

[DiLucy]

Last month, my car made a creaking sound when releasing the brake, which turned out to be a common issue. It was mainly caused by the metal friction noise from the brake wear indicator scraping against the brake disc when the brake pads were worn down. It could also be due to rainwater causing the brake disc to rust or small stones getting stuck. Handling it myself was quite simple: first, check the thickness of the brake pads—if it's less than 3 mm, replace them with new ones. If the pads are still thick, drive the car and gently apply the brakes five or six times to remove the rust layer through friction. Be careful not to brake abruptly to avoid overheating and warping the disc. If the car is parked outdoors for a long time, lightly press the brakes before starting to remove rust. Now that it's cold, the rubber bushings have hardened, which might also cause a knocking sound—this is normal. If still unsure, take it to a shop to check the caliper retraction.

[DeElliott]

Last week, my car made a strange noise when releasing the brake, so I consulted an experienced mechanic. We found four common causes: First, the brake pads on a new car haven't been properly broken in yet. Second, the brake discs are dirty or rusty. Third, lack of lubrication on the caliper guide pins causes poor retraction. Fourth, deformation of the brake pad backing plate. For an older car like mine, checking for rust is the priority. After rain, driving a few hundred meters and applying the brakes several times should help. If the noise persists for two weeks, the caliper needs to be disassembled for inspection, with the pins cleaned and lubricated. Also, pay attention to ensuring the contact surfaces between pads and discs are smooth—deep grooves may require resurfacing. After servicing, it's best to test drive for half an hour to confirm no abnormal noises remain. Safety always comes first.

[VonLondon]

My car always makes a 'click' sound when releasing the brake, and I've figured out quite a bit of experience. The typical cause is the loose retaining spring at both ends of the brake pads, which makes noise when the spring plate bounces upon brake release. It could also be due to slow retraction of the brake caliper, causing the brake pads to drag and rub. Especially in winter when rubber parts harden, the sound becomes more noticeable. My own solution is to remove the wheel, tighten the retaining spring, clean the caliper slide rails, and apply special grease. I also found that brake pads made of overly hard material are prone to noise, so next time I'll choose NAO formula ceramic pads for quietness. Regular maintenance should include: checking caliper pin lubrication every 20,000 km; gently pressing the brakes after washing to evaporate moisture; and regularly cleaning mud and sand from the inside of the wheel hub.