What Causes the Unusual Noise When Braking on Snow?

[DeLorenzo]

When a car makes unusual noises while braking on snow, it is the sound produced during the normal operation of the ABS (Anti-lock Braking System) installed in the vehicle. When the brake is applied, the computer controls the speed of all four wheels to maintain balance, resulting in the unusual noise. When braking on snow, due to the low traction, the wheels are highly prone to locking. Nowadays, the vast majority of cars are equipped with an ABS. The ABS sends commands to the brakes electronically or hydraulically, causing the brake calipers to open and close continuously (hundreds of times per second) to prevent the wheels from locking. The jumping of the brake pedal and the unusual noise from the car are both sounds produced by the normal operation of the ABS. The Anti-lock Braking System, abbreviated as ABS, primarily functions to automatically control the braking force during car braking, ensuring the wheels do not lock and remain in a state of rolling and sliding (with a slip ratio around 20%). This ensures maximum traction between the wheels and the ground.

[LillianAnn]

Having driven for over a decade, I know that strange noises during winter braking are usually caused by ice. Snow accumulates around the brake discs, and once it freezes, it produces sharp squeaking or grinding sounds when braking. Another possibility is that the brake pads are made of a harder material, which becomes particularly brittle in cold temperatures, resulting in loud cracking noises when rubbing against the brake discs. I make it a habit to leave early and lightly apply the brakes a few times on empty roads to melt the ice—usually, the noise disappears after driving two or three kilometers. If the noise persists, it’s likely that the brake pads are worn thin or a small stone is lodged in them, and it’s best to visit a repair shop immediately to avoid deeper scratches on the brake discs, which would cost more to fix. As a side note, try not to park with your wheels submerged in melted snow, as this can cause the brakes to freeze more solidly overnight.

[MartinRose]

I found that most brake noises in snowy conditions are due to moisture freezing. After the snowfall the night before, water accumulated in the brake pad gaps froze, causing a rustling sound when the ice shavings scraped against the metal rotor. Additionally, some cheap brake pads contain more metal particles, which harden at sub-zero temperatures and produce harsh noises. Safety first—I recommend checking the brake pad thickness first; if they're too thin, they must be replaced. Clearing snow from the wheel hubs is also crucial, especially where the hubs meet the brake rotors, as ice buildup is common. If the noise persists, don't try to fix it yourself—seek a professional immediately. Last time, my neighbor stubbornly waited until spring, only to end up replacing the entire brake rotor set, costing over 2,000 yuan extra—totally not worth it.

[IsabelleLynn]

There are three common causes of brake noise in snowy conditions: physical structural issues, material properties, and environmental changes. Metal components contract in the cold, reducing brake pad clearance and altering friction points, leading to squeaking. Standard brake pads harden like rocks below freezing, naturally increasing friction noise. Environmentally, melted snow mixed with grit splashing onto brake discs or snow compacted into ice layers on wheel hubs can also cause noise. I recommend using winter-specific brake pads with softer materials better suited for low temperatures. Before driving, pump the brakes a few times to clear ice. If ice repeatedly forms during short trips, try using compressed air to blow out the brake area. Also worth noting: low tire pressure can exacerbate noise during skidding—remember to adjust it to the standard value.

[DelEloise]

After the last heavy snowfall, my car's brakes also made a clicking sound. The mechanic said it was caused by snow and ice. The snow in the wheel hub cavity melted into water due to the heat, flowed into the gaps of the brake disc, and froze into ice sheets. Every time I braked, it sounded like a knife scraping metal. Another possibility is that the brake caliper guide pins froze and got stuck, preventing the brake pads from returning to their normal position. He taught me a clever trick: use a high-power hair dryer to blow hot air at the wheels for three minutes to melt the ice, which works instantly. If you can't do it yourself, their shop uses de-icer spray—just a couple of sprays will do the trick. The key is prevention—don't park in a warm garage immediately after snow, as the temperature difference can cause more moisture to condense. Also, regularly check the water content in the brake fluid; if it's too high, it can easily freeze.

[SanZoey]

Squeaky brakes after snowfall often stem from icy metal friction. When parked outdoors, melted snow forms thin ice on the rotors, causing grinding noises upon morning startup. Older vehicles face worse issues - deteriorated brake caliper dust boots allow moisture in, freezing pistons and causing uneven friction. I always advise owners to first inspect brake pads: winter-specific versions have noise-reducing coatings, while standard pads fail below -10°C. Next, check tire treads for ice buildup that causes uneven braking pressure. Seasonal brake maintenance helps - cleaning guide pins and applying antifreeze grease. One stubborn customer ignored warnings, driving until calipers froze solid; his tow bill exceeded repair costs. Now he religiously switches to winter brake pads each November - zero issues since.