Brake Disc for OE#31665446 Front Ventilated

Brake Discs Features:                                                   

Daily Commuting (City Driving)

For daily city commuting, high-grade ventilated discs are the optimal option. They effectively manage the heat generated by frequent stops and starts in urban traffic, delivering stable braking performance while maintaining a reasonable cost and ensuring a long service life. Within medium temperature ranges, these ventilated discs sustain steady performance—completely satisfying the needs of city driving.

Tips：

Exceptional Heat Dissipation Efficiency: As a front ventilated disc, its internal design incorporates fin-like air channels. During rotation, it effectively pumps in air to rapidly dissipate the substantial heat generated during braking. This is crucial for the front wheels, which bear the primary braking load, significantly reducing heat fade and ensuring consistent performance during sustained braking scenarios such as mountain driving or high-speed deceleration.

Enhanced Braking Safety: Front wheels deliver approximately 70% of the vehicle's braking force. The ventilated disc design directly improves overall braking efficiency and safety.

Premium Materials: Constructed from high-quality gray cast iron, ensuring stable friction coefficients, exceptional wear resistance, and thermal crack resistance under high stress conditions.

Precision Manufacturing: Rigorous dynamic balancing ensures smooth, vibration-free operation during high-speed rotation. This prevents brake pedal or steering wheel shuddering caused by imbalance, delivering a smooth and comfortable driving experience.

Potential Rust-Resistant Coating: Some OEM-grade brake discs feature rust-resistant coatings on non-friction surfaces (e.g., hub area). This prevents corrosion, maintains appearance, and facilitates future removal.

Overview

This product is a direct‑fit front ventilated brake disc manufactured to match OE reference number 31665446. Designed for vehicles that require this specific disc specification, it delivers the same dimensional accuracy, material quality, and braking performance as the original part. The ventilated construction ensures effective heat dissipation, while ECE R90 certification provides confirmed compliance with European safety standards. With a range of surface finishes and performance‑enhancing design options, this disc serves both standard replacement needs and more demanding applications, including classic car restoration and racing use.

Precise OE Reference Number Matching

• The disc is manufactured to the exact specification of OE part number 31665446, ensuring precise compatibility.

• This eliminates the uncertainty that often comes with generic replacements – the disc fits correctly without modification.

• The reference number confirms that the disc meets the vehicle manufacturer's original design parameters for dimensions, thickness, and material composition.

• For workshops, this simplifies the ordering process and reduces the risk of supplying an incorrect part.

• For vehicle owners, it provides confidence that the replacement disc is exactly what the vehicle requires.

Front Ventilated Design – Effective Heat Management

• The ventilated construction features internal cooling vanes between the two friction surfaces.

• These vanes promote airflow, drawing heat away from the disc during braking.

• Effective heat dissipation reduces the risk of brake fade – particularly important for front‑axle applications, which handle the majority of the vehicle's braking force.

• The ventilated design also contributes to longer component life by reducing thermal stress on both the disc and the brake pads.

• For vehicles that frequently operate in demanding conditions – such as hilly terrain, urban stop‑and‑go traffic, or high‑speed driving – this cooling capability is essential.

Dual Assurance – ECE R90 Certification and OE Specification

• ECE R90 certification confirms that the disc has been tested and approved to meet European safety standards for replacement brake components.

• The certification verifies that the disc delivers braking performance equivalent to the original equipment fitted to the vehicle.

• The OE reference number ensures the disc matches the vehicle manufacturer's dimensional and material specifications.

• Together, these two credentials provide assurance for both safety and compatibility.

• For distributors and workshops, stocking a disc with both OE matching and ECE R90 certification reduces liability and increases customer confidence.

Application Scenarios

Classic Car Restoration

• Classic vehicles often require replacement parts that match original specifications precisely.

• The OE reference number provides confidence that this disc is the correct replacement for vehicles originally fitted with part number 31665446.

• Classic car enthusiasts and restoration professionals value the combination of original specification and modern manufacturing quality.

• The availability of painted or coated finishes helps maintain the authentic appearance of restored vehicles.

Racing and Performance Use

• The ventilated design provides the thermal capacity required for sustained high‑performance driving.

• Drilled and slotted options further enhance cooling and pad cleaning for track or competitive use.

• The disc's structural integrity and precise tolerances support consistent braking performance under demanding conditions.

• For racing teams and performance workshops, this disc offers a reliable, ECE‑certified option that does not compromise on safety.

Everyday Passenger Vehicles

• For standard passenger cars, this disc provides reliable, durable braking performance.

• The ventilated design handles the heat generated during daily driving, including frequent stops and highway cruising.

• The direct OE match ensures installation is straightforward and trouble‑free.

Performance Design Options

Drilled Configuration

• Holes across the friction surface improve heat dissipation and provide additional cooling.

• Water and brake dust are expelled from the friction zone, maintaining effective pad‑to‑disc contact in wet or dusty conditions.

• Particularly valuable for performance, racing, and classic vehicle applications.

Slotted Configuration

• Grooves machined into the surface continuously clean the brake pad face.

• Gas, dust, and debris are removed, preventing the build‑up of glazed layers that reduce friction efficiency.

• Initial brake bite is sharpened, providing a more responsive pedal feel.

Drilled and Slotted Combination

• For those who want maximum cooling, cleaning, and bite, the combined configuration delivers all three benefits.

• This is the preferred choice for racing teams and performance‑oriented drivers.

Ventilated (Standard)

• All variants include the ventilated internal vane structure as standard.

• The ventilation is not optional – it is integral to the disc's thermal management capability.

Surface Protection Options

Oiled

• Light anti‑rust oil film applied during production for protection during storage and transit.

• Easily cleaned before installation using brake cleaner or a suitable solvent.

Painted

• Durable paint applied to the hub and outer edges, providing effective long‑term corrosion resistance.

• Maintains a clean, professional appearance over the life of the disc.

• Particularly suitable for classic car applications where visual authenticity is valued.

Coated

• Advanced anti‑corrosion coating (zinc or geometric) offering superior rust protection.

• The coating gradually wears from the friction area during normal braking, while the rest of the disc remains protected.

• Provides the highest level of corrosion resistance for demanding environments.

Who Is This Product For?

Automotive Aftermarket Distributors

• An OE‑matched, ECE‑certified disc with broad application potential simplifies inventory management.

• The product serves multiple market segments – everyday passenger cars, classic vehicles, and racing applications.

• Multiple finish and design options allow distributors to cater to diverse customer requirements.

Workshops and Service Centres

• Precise OE matching ensures correct fitment every time – no returns, no customer dissatisfaction.

• The ventilated design and performance options allow workshops to offer a quality replacement that meets or exceeds original equipment standards.

• ECE R90 certification provides legal compliance and reduces liability exposure.

Classic Car Specialists

• Precise matching to OE reference number 31665446 makes this disc a trusted choice for restoration projects.

• Modern manufacturing quality provides improved consistency over NOS (new old stock) parts from decades ago.

• Surface finish options align with restoration standards.

Racing Teams and Performance Builders

• The ventilated design and performance options provide the thermal capacity and reliability required for competitive use.

• ECE R90 certification ensures the disc meets safety standards even under extreme conditions.

• Direct OE specification provides confidence in dimensions and material quality.

Why Ventilated Brake Discs are Essential for Front Axles

• The front axle typically handles the majority of the vehicle's braking force – often the larger portion of total stopping power.

• This higher braking load generates significantly more heat at the front than at the rear.

• Without effective ventilation, the disc can overheat, leading to brake fade, reduced stopping power, and accelerated component wear.

• The internal vanes in a ventilated disc actively cool the disc during braking, maintaining consistent performance.

• For vehicles driven in demanding conditions – including classic cars used for touring or racing cars used on track – ventilation is not optional; it is essential.

Quality Assurance and Manufacturing Standards

• Manufactured to the exact specification of OE reference number 31665446.

• Dimensional accuracy verified – run‑out and thickness variation controlled to tight tolerances.

• Material composition consistent with original equipment standards.

• Ventilation vane structure checked for casting integrity and correct orientation.

• Corrosion resistance of surface finishes validated through standardised testing.

• ECE R90 certification confirms safety compliance.

Fitment and Compatibility

• Specifically designed for vehicles requiring OE part number 31665446.

• Front axle application with ventilated construction.

• Direct replacement – no modifications required.

• Side‑specific fitment where applicable – consult catalogue for details.

• Verify fitment using vehicle details (make, model, year, and axle position) through the product catalogue or by contacting Winhere.

• 100% critical dimensions, runout and DTV inspection 

• Material physical and chemical inspection

• Test shear strength, compressibility, density, flatness and parallelism 

• Test performance and noise/NVH