What Causes the Squeaking Noise from the Rear Wheels When the Car is Moving?

[ORichard]

1. The abnormal noise that occurs when the vehicle starts is generally a fault in the suspension system. It may be caused by loose or damaged engine mounts. 2. The abnormal noise that occurs when the vehicle is turning may be due to faults in the steering system or suspension system. During the turning process, the vehicle's tilt causes deformation in the suspension system, which also participates in the movement. 3. The abnormal noise that occurs when the vehicle is driving on good road conditions may be due to faults in the braking system components. It could be caused by loose or worn braking system components, out-of-round brake drums, or uneven brake discs. 4. It could also be an issue with the bearings that connect the moving and stationary parts of the vehicle. If it's a bearing problem, the driver can identify it by applying slight braking. If the noise remains unchanged when the vehicle is moving at a constant speed with braking applied, then it is likely a bearing issue. 5. The abnormal noise that occurs when the vehicle is driving on poor road conditions is mostly due to problems in the suspension system. It could also be caused by a loose braking system. 6. The abnormal noise that occurs during vehicle acceleration, deceleration, or stopping is mostly caused by the suspension system and braking system. The suspension system often produces friction noises. To reduce these noises, drivers should avoid rough driving, minimize driving over bumps, slow down when encountering poor road conditions, and avoid driving through water. These measures can effectively reduce abnormal noises from the vehicle's chassis.

[BryceAnn]

I've encountered this situation before - when driving, the rear wheels make an annoying squeaking noise, most likely due to a brake issue. After taking it apart, I found the brake pads had worn thin, causing the metal backing to rub directly against the brake rotor, producing that sharp sound. Another possibility is sand particles or rust on the brake rotors, especially common for cars left parked for several days after rain. If the braking system has been modified, improperly installed shims or mismatched brake pad models can also cause noise. A faulty wheel hub bearing can create abnormal sounds too, but those tend to be more of a humming noise. The most concerning scenario is when the brake caliper doesn't retract properly, causing the pads to constantly rub against the rotor. Don't underestimate these squeaks - they indicate your braking system needs maintenance. I recommend getting it checked when you have time.

[SanBenjamin]

My old car's rear wheels also squeak when driving. At first, I thought it was because of stones stuck in the tires, but the noise persisted even after cleaning them out. Later, the mechanic said the main issue lies in the braking system: First, the brake pad wear indicator is rubbing against the brake disc, which is a deliberately designed warning device by the manufacturer; second, the brake disc might be uneven, causing friction noise; third, the handbrake cable or spring could be rusted, leading to poor return. Additionally, stones stuck in the tire treads can indeed cause noise, but the sound is sharper. Aging rubber bushings in the chassis suspension can also produce creaking sounds, mostly noticeable on bumpy roads. The key is to distinguish whether the noise occurs only when braking or persists while driving—the former is definitely a brake pad issue.

[MacJuliana]

Rear wheel noise is mostly a metallic friction sound, and there are only three places in the mechanical structure that can produce this kind of sound. The most common issue is with the contact surface between the brake pads and brake discs, especially with cheap brake pads that have high metal content, which are prone to noise. A worn-out wheel hub bearing lacking lubrication will produce a continuous metallic friction sound, and the faster the speed, the sharper the noise. Another easily overlooked cause is deformed mudguards or underbody panels rubbing against the metal when the tire rotates. Once, my friend's car sounded like it was whistling while driving, and it turned out to be a loose wheel arch liner rubbing against the tire. The simplest way to identify the issue is to roll down the window and listen for the source of the sound. Changes in noise during turns can help pinpoint the faulty wheel. It's recommended to first check for any rubbing marks on the rear wheels.

[MiguelRose]

A squeaking noise from the rear wheels while driving is indeed annoying, but the potential safety hazards are even more concerning. First, check the tire condition—pebbles stuck in the tread are the easiest to resolve. Next, focus on inspecting the braking system: brake pads must be replaced if their thickness is below 3mm, and check whether the brake discs have grooves. Observe if the brake caliper guide pins lack lubricating grease, as this can prevent the brake pads from retracting properly. Don’t forget to examine the wheel bearing clearance—if you grab the tire and shake it side to side and feel looseness, it’s time for a replacement. These issues can all cause abnormal noises, especially during turns when the tire load changes, making the sound more noticeable. If the noise suddenly worsens after continuous downhill driving, immediately stop and check the brake temperature.

[MacCaden]

I've dealt with multiple cases of rear wheel noise issues, with common causes concentrated in five areas: First is the braking system, accounting for over 70% of cases, with excessively worn brake pads being the majority among these. Second is damaged wheel bearings, often accompanied by heat and continuous noise. Third is chassis component interference, such as an exhaust pipe hanger coming loose and rubbing against the driveshaft. Fourth is tire problems - besides trapped stones, uneven tire wear can also produce rhythmic friction sounds. Fifth is aging suspension components, like cracked spring cushions. For preliminary diagnosis: if the noise disappears when lightly applying brakes, it's likely a brake pad issue; if the noise worsens on bumpy roads, check the suspension bushings. In short, squeaking sounds are your car's alarm - the sooner addressed, the more peace of mind.