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What Causes Friction Noise When Braking?

3 Answers
ORichard
09/05/25 2:54am
Friction noise when braking can be attributed to several common causes, including noise from new cars, brake disc and pad noise, and sudden braking noise. Noise when braking in a new car: The brake pads and discs of a new car have not yet fully worn in, so they may sometimes produce a "squeaking" friction sound, which is normal. After driving for some time, the noise will naturally disappear. Noise after replacing brake pads: After installing new brake pads, incorrect installation can cause noise. Common installation errors include installing the brake pads upside down, with the metal side facing the brake disc, leading to braking noise. Noise due to brake disc issues: Prolonged use can cause deep grooves on the brake disc surface or deep steps on the edges. Uneven contact between the brake pads and the disc can produce noise. In this case, the brake disc needs to be replaced or polished using a brake disc resurfacing machine. Noise from sand in the brake disc: If foreign objects like sand or small stones get between the brake pads and disc while driving, the brakes may produce a harsh hissing sound. Continuing to drive normally will usually dislodge the debris, eliminating the noise. If the noise persists, the wheel may need to be removed to extract the foreign object. Noise during sudden braking: When braking suddenly, if you hear abnormal braking noise and feel vibrations in the brake pedal, this is a normal phenomenon caused by the activation of the ABS system.
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Joanne
09/17/25 3:33am
I've been driving for over a decade and have encountered many cases of brake noise. The most common is when the brake pads are nearly worn out, and the metal wear indicator produces a sharp metallic scraping sound, which is particularly piercing. If you hear a 'squeak' after rain or when starting after the car has been parked for a while, it's usually due to rust on the brake rotors, and a few hard brakes will clear it. Sometimes, small stones get stuck between the brake pads, causing a 'clicking' noise, and you might feel slight wheel vibration when reversing. Once, my car made a 'grinding' sound when braking, and it turned out the brake rotor had developed grooves. Remember, if the steering wheel shakes when you brake, it's likely due to warped brake rotors, and you should address it immediately.
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LaMadeline
10/31/25 4:04am
Last time I checked my neighbor's hot hatch, it always made a 'squeak' sound when lightly braking. Lifting the wheel revealed both brake pads and discs shining from excessive wear causing metal-on-metal friction. If the noise persists after replacing the brake pads, it might be due to improperly installed shims or insufficient anti-vibration grease. Noise is also common after upgrading to big brake calipers due to large component tolerances. Additionally, when brake disc edges develop ridges, they can scrape against the sides of brake pads causing grinding sounds. These issues all require professional tools for diagnosis - you can't fully determine the cause just by listening.
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What causes the ABS light to illuminate in a Sylphy and how to troubleshoot it?

ABS light illumination can occur in various states, with different causes and solutions for each state. Details are as follows: State 1: ABS warning light remains constantly illuminated (most common). Cause 1: The ABS wheel speed sensor's sensing area is covered by dirt, mud, or other contaminants, affecting its ability to detect the corresponding speed signal. This prevents the ABS control unit from determining the vehicle speed and calculating wheel slip rates, thus failing to issue appropriate commands for brake adjustment. Solution: Clean contaminants from the wheel speed sensor and adjust the gap between the sensor and the signal ring to restore normal function. Cause 2: Poor signal transmission due to loose system wiring connections or faulty ABS relay contacts. Solution: Inspect wiring connections and reconnect any loose terminals. State 2: ABS warning light illuminates intermittently, turning off during acceleration. Cause: When multiple electrical components are in use, battery voltage drops below 10.5V. The light extinguishes when engine speed increases and voltage rises. This may also indicate insufficient power supply voltage to the ABS system due to poor terminal contact or grounding issues. Solution: Check battery specific gravity; inspect charging system; examine power supply components (such as voltage relays or poor power connections). State 3: ABS warning light remains illuminated after engine start until engine IGFF position. Cause: Poor grounding connection of ABS hydraulic valve body; faulty wiring harness connector of ABS hydraulic valve body; ABS control unit malfunction. Solution: Loosen and retighten the hydraulic valve body ground screw, cleaning contact surfaces if necessary; check for enlarged connector gaps; replace ABS or ABS/ASR control unit. State 4: ABS warning light illuminates during high-speed driving. Cause: ABS control unit detects excessive speed difference between rear and front wheels; incorrect tire specifications or incorrect wheel rim specifications. Solution: Verify proper tire and wheel rim specifications according to vehicle requirements, referencing the label near the fuel filler cap. State 5: ABS warning light illuminates intermittently. Cause: Improper brake light switch adjustment; internal contact failure in brake lights. Solution: With engine running, depress brake pedal and manually push the brake switch linkage downward completely, then release pedal to complete self-positioning; replace brake light switch if necessary. When the ABS warning light is illuminated, it's recommended to avoid continued driving. An illuminated ABS light indicates malfunction in the anti-lock braking system. During emergency braking, locked wheels may cause loss of vehicle control and skidding, preventing the driver from decelerating or adjusting vehicle trajectory, posing significant safety risks.
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What are hazard lights?

Hazard lights refer to the warning lights that alert surrounding vehicles not to approach. When a car malfunctions, the hazard lights should be activated. All vehicles are equipped with hazard lights, and when turned on, both the left and right turn signals will flash simultaneously to warn others. The correct usage of hazard lights is introduced as follows: Temporary parking: On highways, dangers can lurk at any moment. If a car breaks down unexpectedly, it becomes a highly hazardous situation. In such cases, the vehicle should be pulled over to the roadside, and a warning triangle should be promptly placed behind the car. Additionally, the hazard lights must be turned on. This is primarily to alert approaching vehicles that there is a malfunctioning car ahead, prompting them to slow down and detour. Driving in fog: When driving in thick fog, heavy snow, or torrential rain, visibility is often extremely low. When visibility drops below 100 meters, it is crucial to turn on the hazard lights, as these conditions pose significant risks. Towing a malfunctioning vehicle: When a car breaks down, it usually requires a tow truck to transport it to a repair shop. In such situations, the hazard lights must be activated on both the malfunctioning vehicle and the towing vehicle. Since the towed vehicle cannot be maneuvered flexibly, the speed should be reduced to a minimum, and surrounding vehicles should be constantly reminded to yield.
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What is a Permanent Fault Code?

A permanent fault code in a vehicle is a type of malfunction that affects the operation of the equipment and cannot be resolved without taking specific measures to restore normal operation. Permanent fault codes in vehicles cannot be deleted or overwritten unless the manufacturer is contacted, and professional technicians modify the vehicle's onboard computer program to remove the code. In reality, if a car displays a permanent fault code, it is necessary to visit a 4S shop or a professional auto repair shop. There, a technician can connect a diagnostic computer to the vehicle to read the fault code and determine the exact issue. Only by identifying the problem can it be properly repaired. Automotive fault codes are codes generated by the vehicle's ECU (Engine Control Unit) after analyzing a malfunction. When these codes appear, the vehicle has a fault, and the fault indicator light remains illuminated. To fully resolve the issue, a professional diagnostic tool (such as a K81 or laptop) is required to decode and clear the fault—commonly referred to as troubleshooting. Fault codes are categorized into active codes, historical codes, and intermittent codes. Active codes are easy to detect, historical codes refer to previously unresolved faults that were not cleared, while intermittent fault codes are not consistent.
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How to Fix a Non-Rotating Rear Wheel of a Car?

Step on the accelerator hard, and as long as the rear wheel moves, it should be fine. The second method is to remove the tire and then loosen the contact surface between the brake disc and brake pad. Use the onboard tire removal wrench on any of the wheel bolts of the stuck wheel, and twist forcefully—direction doesn’t matter—to force it to rotate once. If the temperature of the brake disc and brake pad exceeds the ambient temperature, stopping immediately after encountering water can cause rapid cooling, leading to rust on the surfaces of both components and resulting in the rear wheel becoming stuck.
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How long to wait after car window tinting before installing ETC?

You need to wait one month after car window tinting before reinstalling the ETC. ETC working principle: Through the on-board electronic tag installed on the vehicle's windshield, dedicated short-range communication is established with the microwave antenna in the ETC lane at toll stations. This utilizes computer networking technology to perform background settlement processing with banks, achieving the purpose of vehicles passing through highway or bridge toll stations without stopping while still paying the fees. ETC usage precautions: The ETC transaction sensing range is 8 meters. When encountering a stationary vehicle ahead, maintain a distance of over 10 meters to prevent automatic fee deduction for the preceding vehicle in case its ETC device malfunctions or is absent. The recognized speed for ETC lane passage is 20km/h. Excessive speed may prevent reading vehicle device information, leading to failed fee deduction. Unauthorized removal or displacement of OBU devices, or detachment/loosening of ETC electronic tags will cause tag deactivation. These can be taken to the bank where the ETC card was issued or highway service offices for inspection. Non-deliberate loosening or detachment only requires reactivation. When using debit cards bound to ETC, insufficient balance may cause fee deduction failure. Follow on-site staff guidance to use manual MTC lanes with cash or card payment. Excessively thick windshields may cause poor signal reception. This is particularly noteworthy for vehicles that have had windshield replacements after accidents or modified front windshields.
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Will a deduction of 6 points during the probationary period of a driver's license extend the probationary period?

A and B class driver's licenses: If more than 6 points are deducted during the probationary period, the probationary period will be extended by one year. If more than 6 points are deducted again within the extended year, the license will be directly revoked. Therefore, it is best not to accumulate 6 points during the probationary period for A and B class licenses. For C class licenses and motorcycle driver's licenses, as long as the points do not reach 12 during the probationary period, the probationary period will not be extended. Accumulating 12 points will result in the immediate revocation of the license. Details are as follows: 1. C class driver's license: A deduction of 6 points during the probationary period of a C1 driver's license will not affect the probationary period, as long as the violation is promptly addressed and the fine is paid. The points will be cleared at the end of the scoring cycle. For C class licenses and motorcycle driver's licenses, as long as the points do not reach 12 during the probationary period, the probationary period will not be extended. Accumulating 12 points will result in the immediate revocation of the license. To drive again, one must reapply and retake the driver's license test. Therefore, it is crucial not to accumulate 12 points during the probationary period for C class licenses. 2. A and B class driver's licenses: For A and B class driver's licenses, if more than 6 points are deducted during the probationary period, the probationary period will be extended by one year. If more than 6 points are deducted again within the extended year, the license will be directly revoked. Therefore, it is best not to accumulate 6 points during the probationary period for A and B class licenses.
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