PV Heavy Duty 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 

• Steel-Hat Mechanical Joint Integrity & Anti-Fretting Design:

The steel-hat construction of this heavy-duty passenger vehicle brake disc relies on a precision-engineered mechanical joint between the cast iron friction ring and the steel center hat — an interface that is subjected to continuous shear forces, thermal cycling, and micro-movement during normal braking operation. This disc is designed with a joint geometry that maximizes contact pressure and mechanical interlock between the two materials, preventing the fretting corrosion, micro-slip, and joint loosening that can occur in lesser-quality composite discs when the interface is subjected to repeated load cycles. The steel hat itself is fabricated from high-strength steel that provides superior tensile and fatigue resistance compared to cast iron in the mounting zone, where bolt clamping forces and hub contact stresses are concentrated. This mechanical joint integrity ensures that the disc remains structurally sound and true throughout its service life, even under heavy-duty passenger vehicle operating conditions.

• Slim-Profile 320mm × 12mm Thermal Mass Management:

With a 320mm diameter and a slim 12mm friction ring thickness, this brake disc occupies a unique design space that balances weight reduction against thermal capacity. The 12mm profile reduces overall disc mass and rotational inertia compared to thicker-disc alternatives, contributing to improved vehicle responsiveness and marginally reduced fuel consumption — a meaningful consideration for passenger vehicles where efficiency and driving dynamics are valued. However, the reduced thermal mass of the slim profile requires careful thermal management to prevent excessive temperature rise during repeated braking; this is addressed through the ventilated internal vane structure, the high thermal conductivity of the G3000 and GG15HC high-carbon gray iron formulation, and the optimized disc geometry that promotes efficient heat dissipation. The result is a lightweight disc that maintains adequate thermal performance for heavy-duty passenger vehicle braking demands.

• Heavy-Duty Cyclic Fatigue Resistance for Passenger Vehicle Applications:

Engineered for heavy-duty passenger vehicle use — including vehicles that operate in mountainous regions, carry frequent passenger or cargo loads, or are driven in urban environments with repeated stop-and-go braking — this disc is formulated and constructed to resist the cyclic thermal and mechanical fatigue that accumulates over thousands of brake applications. The high-carbon gray iron friction ring (G3000 / GG15HC, DIN and SAE certified) provides a dense, fatigue-resistant microstructure that withstands the rapid heating and cooling cycles of repeated braking without developing the thermal cracks, surface hardening, or permanent distortion that can shorten the service life of standard discs. The steel hat further contributes to fatigue resistance by absorbing and distributing mounting stresses that would otherwise be concentrated in the more brittle cast iron material, extending the overall structural lifespan of the composite assembly.

• Ventilated Internal Vane Cooling for Slim Disc Geometry:

The ventilated internal vane structure of this 320mm disc is specifically optimized to compensate for the reduced thermal mass of the 12mm slim profile, actively drawing ambient airflow through the disc as it rotates to accelerate heat dissipation and maintain operating temperatures within a safe range. The vane geometry is designed to maximize airflow volume and velocity through the disc interior, creating a forced-air cooling effect that is particularly effective during sustained braking — such as downhill descents or repeated high-speed deceleration — where the slim disc's lower thermal capacity could otherwise lead to elevated temperatures and increased risk of brake fade. This ventilated cooling design ensures that the lightweight benefit of the slim profile is achieved without sacrificing the thermal performance required for heavy-duty passenger vehicle operation.

• Coated Corrosion Protection for Steel-Hat & Cast-Iron Interface:

The coated surface finish on this heavy-duty steel-hat disc provides corrosion protection that addresses the unique challenge of a dissimilar-metal joint: where the steel hat meets the cast iron friction ring, there exists a potential for galvanic corrosion if moisture and road salts penetrate the interface. The coated treatment forms a continuous, adherent barrier across both the steel hat and the non-friction surfaces of the cast iron ring, sealing the joint interface against moisture ingress and preventing the electrochemical corrosion that can occur between dissimilar metals in corrosive environments. This coating also preserves a clean, professional appearance on the steel hat — visible through wheel spokes — and prevents rust-related surface degradation on the cast iron ring that could lead to irregular wear and reduced braking performance over time.

• Globally Certified Precision Manufacturing & Dimensional Consistency:

Produced in an IATF16949-certified facility with full ECE R90 and AMECA compliance, and backed by ISO14001 environmental and ISO45001 occupational health management systems, this heavy-duty passenger vehicle brake disc meets stringent international quality and safety standards. Each disc undergoes precision turning and grinding to achieve strict dimensional tolerances — including the critical 12mm friction ring thickness and 320mm diameter — a perfectly flat friction surface, exact hub-centric fitment, and verified steel-hat joint integrity, followed by dynamic balancing and multi-stage quality inspection. Available with oiled, painted, coated, and zinc-dust anti-rust treatments, and packaged in boxes, cartons, pallets, or bulk configurations for global distribution, the disc is offered with private label and customized branding options to meet specific distributor and retailer requirements.

Brake Pads Features:

•High performance 

•Long-life service 

•Anti-fade 

•Low noise, low dust 

•Environmental friendly

• Friction Transfer Film Optimization for Steel-Hat Composite Discs:

These pads are formulated to establish and maintain a thin, uniform friction transfer film on the cast iron friction ring of the steel-hat composite disc — a critical factor in achieving consistent braking performance and minimizing disc wear. The transfer film, which forms as the pad material gradually deposits a micro-thin layer onto the disc surface during normal braking, creates a stable friction interface that prevents direct metal-to-metal abrasion and promotes even, predictable wear. The formulation is optimized to work with the high-carbon gray iron surface of the composite disc, ensuring that the transfer film forms quickly during the initial bedding-in period and is maintained throughout the pad's service life, even under the heavy-duty cyclic braking conditions that the disc is designed to withstand.

• High-Cycle Wear Consistency Under Repeated Braking:

Engineered for heavy-duty passenger vehicle applications involving frequent, repeated braking cycles, these pads deliver consistent wear characteristics across their entire service life — resisting the uneven wear, tapering, and edge chipping that can occur when pads are subjected to hundreds of brake applications per day in urban or mountainous driving. The wear-resistant friction compound and robust steel backing plate maintain uniform thickness and structural integrity through extended high-cycle use, ensuring that braking performance remains predictable and consistent from the first stop to the last, without the gradual degradation in pedal feel or stopping power that can accompany uneven pad wear.

• Slim-Disc Compatible Pressure Distribution & Contact Geometry:

The pad friction surface and backing plate geometry are engineered to provide uniform pressure distribution across the 12mm slim-profile friction ring of the steel-hat disc, ensuring that braking force is applied evenly across the entire contact area without localized high-pressure spots that could cause excessive wear, heat buildup, or disc scoring. The chamfered and slotted edge design of the pad further promotes smooth, progressive engagement with the slim disc surface, preventing edge-induced vibration and noise while ensuring that the full friction surface area is utilized effectively. This pressure distribution optimization is particularly important for slim-profile discs, where the reduced friction ring thickness leaves less margin for localized overheating or uneven wear.

• Low-Conductivity Backing Plate for Thermal Barrier Protection:

The pads feature a steel backing plate with a low-conductivity under-layer treatment that acts as a thermal barrier, limiting the conduction of heat from the friction material — where braking heat is generated — to the brake caliper piston and hydraulic brake fluid. This thermal barrier protection is valuable for heavy-duty braking scenarios where sustained or repeated braking can generate significant heat, as it helps prevent brake fluid boil and caliper seal degradation that can lead to spongy pedal feel and reduced braking performance. The low-conductivity backing plate also contributes to more consistent friction material temperatures, reducing the likelihood of thermal gradients within the pad that can cause uneven wear or friction inconsistency.

• Sustainable Friction Material Sourcing & Eco-Conscious Production:

Manufactured under ISO14001-certified environmental management systems, these pads are produced with a focus on sustainable friction material sourcing — including the use of recycled raw materials where feasible and the reduction of environmentally impactful components in the friction formulation — and resource-efficient production processes that minimize waste, energy consumption, and emissions. The eco-conscious production approach ensures that the pads deliver reliable heavy-duty braking performance while minimizing their environmental footprint across the full product lifecycle, from raw material sourcing through manufacturing to end-of-life recyclability of the steel backing plate.

• 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