BMW Composite Steel Hat Brake Discs

• Being a world leading professional brake parts manufacturer, Winhere produces more than 55 million units of brake discs and 10 million sets of brake pads annually for OEM and IAM. 

• 96%+ car parc coverage of brake discs and brake pads from A to Z for both passenger cars and commercial vehicles. 

• IATF16949, ISO14001, ISO45001, ECE R90, CNAS certificated. 

• National Green Manufacturer and China’s Champion Enterprise awarded by M.I.I.T. and C.F.I.E. 

• National Standard of “Brake Disc for Automobile” GB/T 34422-2017 is led by National Quality Supervision and Inspection Center for automobile parts, Winhere is the responsible drafting company for this national standard.

Brake Discs Features:                                                   

•Equivalent to OE design 

•Smooth and quick stop 

•Anti-rust 

•Low noise, low dust 

•Optimal thermal performance 

• Two-Piece Composite Steel Hat Construction:

This BMW brake disc features an advanced two-piece composite construction that separates the friction ring from the center mounting hat — a design philosophy commonly found in high-performance and motorsport applications. The outer friction ring is cast from high-carbon gray iron (G3000 / GG15HC) for optimal friction characteristics and thermal stability, while the center hat is fabricated from steel, creating a composite assembly that leverages the strengths of both materials. This two-piece design allows the friction ring to expand and contract thermally without transferring excessive stress to the hub mounting interface, reducing the risk of disc distortion, pedal pulsation, and premature wheel bearing heat damage that can occur with one-piece cast iron discs under extreme braking conditions.

• Lightweight Design & Reduced Unsprung Mass:

The composite steel hat construction delivers significant weight savings compared to a conventional one-piece cast iron disc of equivalent 364.5mm diameter. The steel hat is substantially lighter than a cast iron hat of the same dimensions, reducing overall disc mass and, critically, reducing unsprung weight — the mass not supported by the vehicle's suspension system. Lower unsprung mass translates to improved suspension response, better wheel traction over uneven road surfaces, enhanced steering feel, and a measurable improvement in vehicle dynamics. For high-performance BMW applications, this weight reduction also contributes to quicker acceleration and marginally improved fuel efficiency without compromising braking performance or structural integrity.

• Thermal Isolation from Hub & Wheel Bearing:

A key engineering advantage of the composite steel hat design is its ability to thermally isolate the friction ring — where braking heat is generated — from the wheel hub, wheel bearing, and surrounding suspension components. The steel hat acts as a thermal barrier, limiting the conduction of heat from the cast iron friction ring to the hub assembly, thereby protecting temperature-sensitive components such as wheel bearing grease, ABS sensors, and suspension bushings from heat-related degradation. This thermal isolation is particularly valuable during sustained heavy braking, track days, or mountainous driving, where one-piece discs can transfer significant heat to the hub and accelerate wear of adjacent components.

• 364.5mm Large-Diameter Ventilated Performance (364.5mm × 123mm):

With a substantial 364.5mm diameter and 123mm total height, this large-format ventilated brake disc provides an expansive friction surface area and significant thermal mass, enabling it to absorb and dissipate the extreme heat generated by high-performance BMW braking systems. The internal ventilated vane structure channels ambient airflow through the disc as it rotates, actively accelerating heat dissipation and reducing peak operating temperatures during sustained heavy braking. This combination of large diameter, ventilated construction, and composite design makes the disc well-suited to the elevated braking demands of high-horsepower BMW performance models.

• Multi-Option Anti-Corrosion Finishes (Painted / Coated / Oiled / Zinc-Dust):

Available with a range of protective surface treatments including painted, coated, oiled, and zinc-dust finishes, each engineered to shield both the cast iron friction ring and the steel hat from environmental corrosion, road salt, moisture, and oxidation. The painted and coated options are particularly well-suited to this composite design, as they provide a durable, aesthetically pleasing finish on the steel hat and non-friction surfaces of the cast iron ring — important for performance vehicles where the brake disc is prominently visible through large-diameter alloy wheels. All finishes are applied to strict quality standards and do not compromise the friction performance or structural integrity of the composite assembly.

• High-Carbon Gray Iron Friction Ring & Precision Manufacturing:

The friction ring is cast from premium high-carbon gray iron conforming to G3000 and GG15HC material grades and formulated to both DIN and SAE standards, providing an optimal balance of friction consistency, thermal conductivity, wear resistance, and vibration damping. Each composite disc undergoes precision turning and grinding to achieve strict dimensional tolerances, a perfectly flat friction surface, and exact hub-centric fitment for BMW applications, followed by dynamic balancing and multi-stage quality inspection. Produced in an IATF16949-certified facility with full ECE R90 and AMECA compliance and ISO14001 / ISO45001 management system certification, the disc is packaged in boxes, cartons, pallets, or bulk configurations for global distribution, with private label and customized branding options available.

Brake Pads Features:

•High performance 

•Long-life service 

•Anti-fade 

•Low noise, low dust 

•Environmental friendly

• Performance-Matched Friction Compound for Composite Discs:

Formulated to complement the high-performance composite steel hat brake disc, these pads deliver a high and stable coefficient of friction engineered to work optimally with the high-carbon gray iron friction ring. The friction material is designed for consistent performance across a broad temperature range — from cold morning starts to the elevated temperatures generated by high-performance driving — ensuring predictable, confidence-inspiring stopping power and pedal feel in all operating conditions.

• Thermal Stability & Fade Resistance:

Engineered to resist thermal fade and glazing under the high-heat conditions typical of high-performance braking, the pad compound retains its friction characteristics and structural integrity during repeated hard stops, sustained downhill braking, and track-style driving. This prevents the spongy pedal feel and increased stopping distances associated with pad fade, giving drivers consistent, reliable performance when braking demands are at their highest.

• Extended Wear Life for Performance Use:

The wear-resistant friction formulation and heavy-duty steel backing plate are built to withstand the increased mechanical and thermal demands of high-performance driving, delivering extended service life even under aggressive use. The pads resist uneven wear and maintain consistent thickness throughout their service interval, providing uniform, predictable braking performance until replacement.

• Low-Noise, Low-Dust Operation:

Precision-ground friction surfaces, chamfered edges, and under-layer noise dampening work together to minimize brake squeal and vibration, while the low-dust formulation reduces unsightly brake dust accumulation on high-performance alloy wheels. The composite disc's smooth, precision-ground friction surface further contributes to quiet, chatter-free operation and cleaner wheels.

• Environmentally Conscious Production:

Manufactured under ISO14001-certified environmental management systems, these pads are produced with resource-efficient processes and formulations designed to minimize environmental impact. The production workflow prioritizes responsible material sourcing, waste reduction, and emissions control, ensuring that high-performance braking capability is achieved without compromising environmental sustainability.

• 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