What Causes the Noise When the Brake Pedal is Released?

[LaWalter]

The reason for the noise when the brake pedal is released is either an incorrect contact angle between the brake pads and the brake disc or the recent replacement of new brake pads. If this occurs, the owner can visit a professional institution to have a specialist adjust it. Below is an introduction to the brake system: 1. Introduction: As the name suggests, it is a mechanical braking device that can slow down the vehicle, also known as a decelerator. 2. Structure: The car brake pedal is located under the steering wheel. Pressing the brake pedal causes the brake lever to be pressurized and transmitted to the brake shoes on the brake drum, which then clamp the brake disc. 3. Function: To slow down or stop the vehicle. The manual brake in a car is located next to the gear shift and is connected to the brake lever. Common examples also include bicycle brakes, which rely on rod-shaped brakes fixed to the frame or disc-shaped caliper brakes to slow down.

[Imogen]

The brake pedal makes a creaking sound when lifted, which I also encountered last time. This is often caused by lack of lubrication on the spring or pivot connected to the pedal, resulting in dry friction noise. Especially for older cars that have been driven for four or five years, aging and hardened rubber components are more prone to making noise. I recommend first checking the U-shaped spring above the pedal and spraying some WD40. If the noise persists, it might be an issue with the internal diaphragm of the vacuum booster, which requires disassembly and part replacement. Another easily overlooked cause is loose mounting bracket screws for the pedal; I solved this by tightening them myself. Remember to regularly lubricate the pedal pivot to prevent most abnormal noises. Otherwise, long-term dry friction can lead to poor return, increased brake clearance, and safety risks.

[StRyder]

I've studied many similar cases. Brake pedal noises mostly occur during the rebound moment, primarily originating from mechanical connection points. Lack of lubrication in the pivot joint can cause squeaking sounds, just like rusty door hinges - spraying some lubricant can last half a year. Additionally, wear at the pushrod connection of the brake master cylinder may produce clicking noises, requiring special grease here. The most troublesome case I've encountered was hissing caused by vacuum booster leaks, which requires complete replacement. I recommend having technicians thoroughly check pedal travel smoothness during each maintenance service. Early intervention can prevent more expensive repairs, as brake failure is certainly no trivial matter.

[LaAubrey]

As a seasoned driver with over 200,000 kilometers of experience, I've encountered this issue three times. In new cars, it's usually due to insufficient lubrication of the pedal pivot—just spray some rust remover to fix it. For vehicles older than five years, watch out for deformed spring brackets or excessive clearance in the brake master cylinder push rod, which can cause metallic friction noises. If the noise is particularly noticeable in rainy weather, it's likely 80% due to water ingress and aging of the pedal buffer rubber sleeve. For DIY troubleshooting, try this: With the engine off, repeatedly press the pedal 50 times to reset the components. If the noise persists, a professional inspection is necessary—don't risk compromising driving safety over minor issues.

[Regina]

Don't ignore this abnormal noise! Last week, my friend's car had pedal noise that wasn't taken seriously, and it almost caused an accident on the highway due to soft brakes. Common causes fall into three categories: mechanical issues mainly involve lack of lubrication in the pedal hinge, which can be fixed by spraying lubricant; hydraulic system problems like poor piston return in the master cylinder can produce a bubbling sound; electronic system issues such as ABS sensor interference may cause an electric buzzing noise. From my experience, if this is accompanied by a longer pedal travel or a softer pedal feel, immediate inspection is necessary. Keeping the brake system clean is especially important, as dust entering the pivot can accelerate wear.