Brake Pads Care In Winter

Winter is a harsh testing ground for brake pads, as the combined effects of low temperatures and complex road conditions significantly weaken their performance. Most brake pad materials undergo physical changes in sub-zero environments; for example, the hardness of metal brake pads increases while their flexibility decreases, leading to reduced contact with the brake disc and slower braking response.

Real-world tests show that at -20°C, the coefficient of friction of brake pads can decrease by more than 20%, potentially extending a braking distance from 50 meters to 65 meters – enough to cause an accident on icy or snowy roads.

Road conditions further amplify the risks. Snow-covered or thinly icy roads require frequent light braking to control speed, causing brake pads to wear more than three times faster than in summer. Simultaneously, the dry and windy winter environment allows sand and dust to easily penetrate the brake pad gaps. These "invisible abrasives" create a rough surface, producing harsh noises and further reducing braking stability.

Electric vehicles, due to the high usage of their regenerative braking systems, often have brake discs that are idle for extended periods. When these discs come into contact with water, they are more prone to rusting and freezing, creating safety hazards. Material Selection: Ceramic or Metal Brake Pads for Winter?

Brake pad material directly determines braking performance in winter, with different materials suited to different scenarios:

Low-metal brake pads are considered "extreme cold weapon," offering a braking response 0.3 seconds faster than ceramic pads at -20°C, with 35% lower replacement costs per use, and resistance to wear from frequent heavy braking. They are particularly suitable for commuter vehicles and heavy-duty trucks in frigid regions.

Ceramic brake pads excel in quietness and longevity, withstanding temperatures above 800°C. They produce less dust and cause less wear on brake discs, but their initial braking performance at low temperatures is slightly inferior. They are more suitable for urban commuting or mid-to-high-end vehicles sensitive to noise.

In extreme scenarios, powder metallurgy materials are the preferred choice for heavy machinery due to their superior wear resistance, while carbon fiber is mostly used in racing cars, but its high cost makes it difficult to popularize.

The core principle for selecting brake pads is "scenario suitability": choose low-metallic brake pads for extremely cold northern regions, ceramic brake pads for damp and cold southern regions or urban commuting, and hybrid material brake pads are becoming a new trend that balances performance and cost-effectiveness.

Common Winter Faults: Identification and Emergency Handling Guide

Brake Performance Degradation: Manifests as a hard pedal feel and increased braking distance, often due to insufficient brake pad thickness (less than 3mm requires replacement) or brake fluid containing water and freezing. Immediately increase following distance and avoid sudden braking. Change brake fluid every two years to ensure smooth hydraulic transmission.

Brake Pad Sticking: Frozen snow or mud can prevent brake pads from returning to their original position, causing vehicle pull and uneven wear. If frozen, thaw with warm water (avoid boiling water); mechanical sticking requires professional cleaning of the calipers and replacement of the dust covers.

Brake Noise and Softening: A harsh friction sound may indicate excessive wear or foreign objects. A soft pedal may indicate low brake fluid or air in the lines; immediately check, replenish, and bleed the air. Maintenance Tips: 5 Keys to Safely Protect Your Brake Pads Through Winter

Regular Check-ups: Check brake pad thickness weekly (safe value should not be less than 2mm) by observing the wheel rim gaps or using a straw. Also, pay attention to brake fluid level and clarity.

Drying and Moisture Prevention:

After washing the car or driving through water, lightly apply the brakes 5-6 times at low speed to use frictional heat to dry any moisture and prevent freezing and deformation.

Proper Break-in: Newly replaced brake pads require a 300km break-in period. During this time, avoid emergency braking to allow the friction surfaces to fully engage.

Parking Tips: In icy or snowy weather, avoid fully engaging the handbrake. Use stones to prevent the car from rolling. When parking outdoors, cover the wheel rims with a cloth to reduce snow and water accumulation.

Preheating: After starting the engine, let the brakes idle for 1-2 minutes. Lightly apply the brakes while driving at low speed to warm them up, especially for ceramic brake pads, which need sufficient heat to reach optimal performance.