Front Brake Discs for BYD F6

The braking system of the BYD F6 adopts a classic configuration consisting of a front ventilated disc brake and a rear solid disc brake; since the front wheels bear more than 70% of the total braking force, the heat dissipation performance of the front brake disc is critically important. Based on these design considerations, we have introduced this front brake disc specifically designed for the BYD F6-often referred to by overseas customers as the "Front Brake Disc / Front Brake Rotor / Ventilated Rotor" -with an exclusive OEM part number OE-EG3501119, manufactured using 1:1 mold casting in strict accordance with the original F6 service manual:

Structural Type: Ventilated Disc – features 18 axial air channels; during high-speed rotation, these channels generate air convection, resulting in a heat dissipation efficiency that exceeds that of solid discs by more than 40%. Standard thickness: 24–26 mm (including the total air channel thickness); friction surface thickness complies with original manufacturer design requirements; disc runout tolerance: ≤0.05 mm, ensuring no vibration during high-speed braking; minimum operating thickness (MIN THK): indicated via laser engraving on the side of the disc head, with an engraving depth of 0.2 mm, conforming to the mandatory marking requirements of GB/T 34422-2017; unlike rear brake discs, the EG3501119 utilizes an integral cast structure featuring dual friction surfaces and an intermediate air channel, enabling it to withstand the instantaneous peak temperatures exceeding 600°C generated during F6 full-load braking. No additional machining is required during installation; it can be assembled directly upon unpacking, providing perfect compatibility with the F6 ABS+EBD braking system.

Front Brake Disc for BYD F6 (OE No. EG3501119) featuring an upgraded four-layer composite protective coating system, specially engineered for demanding front-wheel operating conditions including constant water spray, gravel impact, and high-temperature oxidation. Unlike standard single-coat brake discs on the market, this multi-layer composite process delivers full-surface rust protection and ensures long-term braking stability, meeting the high standards required for bulk replacements in repair shops and export wholesale procurement.
Total dry film thickness is precisely controlled within 30–45μm-slightly thicker than rear disc coatings to match the higher operating temperatures of front brakes-balancing thermal structural stability with lasting corrosion resistance. Each layer is applied under tightly controlled thickness and standardized production parameters, backed by third-party laboratory certification to ensure consistent quality across bulk orders.

Layer 1: Nano-Ceramic Primer
Standard Thickness: 10–15μm
Core Protection Mechanism: Nano-ceramic particles penetrate micropores in the cast iron substrate, forming a chemically bonded barrier that blocks oxygen contact with the iron surface, preventing rust at its source.
Process Advantage: Cured via low-temperature baking at 80°C to avoid heat-induced deformation of ventilated disc cooling channels, preserving original disc flatness.

Layer 2: Zinc-Aluminum Flake Intermediate Barrier Layer
Standard Thickness: 12–18μm
Structural Design: Interleaved stacking of 5–10μm zinc flakes and 5–8μm aluminum flakes achieves ≥95% surface coverage, creating a seamless anti-corrosion shield.
Sacrificial Anode Protection: The zinc-aluminum alloy layer provides cathodic protection; even if the coating is locally scratched to expose the metal substrate, the base material remains protected, preventing rust spread.
Verified Performance Data: Third-party certified with neutral salt spray (NSS) resistance ≥260 hours without red rust-proven corrosion performance.

Layer 3: High-Temperature Functional Topcoat
Standard Thickness: 25–35μm
Formulation: Silicone-modified acrylic resin withstands temperatures up to 300°C, enduring repeated high-heat loads from frequent emergency braking.
Environmental Durability: Salt spray resistance ≥300 hours; passes 50 cycles of thermal shock testing from –40°C to 300°C with no cracking, peeling, or blistering.
Braking & Aesthetic Performance: Premium matte silver-gray finish; stable friction coefficient maintained at 0.35–0.45, fully compliant with automotive braking friction standards for uniform, safe stopping power.

Layer 4: Permanent Laser Traceability Marking
Applied using a 20W fiber laser to permanently engrave key information on the disc surface: OE code EG3501119, minimum wear thickness (MIN THK), and exclusive batch number.
Engraving Specs: Depth 0.2mm, width 0.3mm
High-Temperature Stability: Markings remain clear, fade-proof, and intact under continuous 300°C operating conditions.
Regulatory Compliance: Fully meets Clause 5.9 of GB/T 34422-2017, satisfying mandatory requirements for permanent, legible identification on automotive brake components.

The laser traceability system enables full product lifecycle management. Repair shops, parts wholesalers, and end-users can scan codes to verify authenticity, production batches, and factory inspection records. This anti-counterfeiting mechanism effectively prevents counterfeit brake discs from entering the aftermarket, safeguarding the interests of distributors, service centers, and brand owners-ensuring confidence throughout procurement and use.

Compatible Vehicle Models

This brake disc is compatible with a wide range of car models, as follows:

Cross Reference Part Number Table

Workshop Environment

The constant temperature accuracy of the precision machining workshop is ±0.8°C (higher than the ±1°C standard for rear brake discs; front brake discs feature greater thickness and are more sensitive to temperature control).

The workshop is equipped with German HESSLER dual-spindle CNC lathe (Model: DLC-500) and Japanese MAZAK horizontal machining center (Model: HCN-6800).

Special production line for ventilated brake discs, consisting of air channel milling station, double-sided grinding station and dynamic balance correction station.

Real-time monitoring via MES production information management system with a data sampling frequency of 1 time per second.

🔍 Inspection Stations (7 key stations in total, including one extra air channel inspection station compared with rear brake discs)

1. Electromagnetic induction flaw detection station: 100% inspection for internal casting cracks, with sensitivity to artificial defects of Φ0.5mm.

2. Air channel dimension inspection station: Special plug gauges used to test the width (8±0.2mm) and depth (15±0.3mm) of 18 air channels.

3. Double-sided grinding precision inspection station: Contact probe measures the flatness of friction surfaces to be ≤0.02mm.

4. 100% full dynamic balance inspection station: Unbalance amount ≤15g·cm; automatic cutting for weight removal if standards are exceeded.

5. LVDT inner and outer diameter measuring station: Centering accuracy ±2μm, repeatability ±1μm, cycle time ≤6 seconds per workpiece.

6. Salt spray sampling test station: Batch sampling inspection with the requirement of no red rust after at least 260 hours of testing.

7. Laser marking & visual recognition station: OCR system automatically reads engraved OE part number EG3501119 with zero error rate.

📋 Quality Inspection Sampling Ratio & System Certifications

The factory implements the "Three-Inspection System" (self-inspection, mutual inspection, professional inspection) plus full inspection before delivery.

100% inspection is conducted on critical dimensions (thickness, runout, air channel dimensions).

We have obtained international management system certifications including IATF 16949:2016, ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018.

ECE R90 E1 product certification (mandatory EU certification for replacement brake components) is available; the certificate number can be obtained from the sales team.

The defective rate is controlled below 4800 PPM (0.48%), outperforming the industry average of 3%.

Each EG3501119 brake disc is printed with a unique traceability code; scanning the code enables access to production time, equipment serial number and inspector ID.

📌 Reason for Stricter Inspection Standards for Front Brake Discs: The front wheels of the F6 model bear a high proportion of braking force, and brake failure will lead to severe consequences. Our MES system applies SPC statistical process control to all production data of EG3501119. The production line will automatically halt for adjustment when the Cpk value drops below 1.33, which delivers far higher reliability than manual sampling adopted by most competitors.

📦 Packaging and Shipping Process: Unit Protection: Packaged in PE bags wrapped with rust-proof paper (an additional layer of vapor barrier film is applied due to the heavy weight of front discs).

• Internal Separation: Each box contains 2 units, separated by EPE foam and corrugated paper partitions for dual cushioning.
• External Reinforcement: Five-layer double-walled corrugated boxes (edge strength ≥8000 N/m), wrapped with stretch film and packing tape.
• Transport on Wooden Pallets: EU-standard wooden pallets (1200×800 mm), with 8 boxes/16 units per pallet, fully covered with wrapping film and corner guards

🛡 Warranty Period and After-sales Terms: Warranty starts from the B/L date, not the shipping or delivery date, to avoid delays affecting coverage.

• Warranty duration: 12 months or 80,000 km (whichever comes first), covering normal wear of F6 discs. Coverage includes manufacturing defects such as casting porosity, coating peeling (non-human-induced scratches), dimensional deviations, dynamic balance issues, and air duct blockages.
• After-sales Response: Project managers respond within 2 hours of receiving complaints; damages are addressed immediately in subsequent shipments without waiting for returns (reducing inventory pressure).

💰 Payment and Order Policies: First Order: 30% T/T upfront + 70% balance due before shipment.

• Repeat Orders (with prior cooperation): LC at sight or OA within 30 days (requires Dun & Bradstreet code and financial statements). MOQ: 50 sets for standard orders (suitable for cross-border e-commerce); 1×40HQ container for full-lot orders (approximately 1,200 sets).
• Sample Policy: Paid samples available (delivered within 7 working days). A minimum order amount of $5,000 qualifies for a discount on sample fees.
• Booking and logistics: Partner shipping companies include MAERSK, MSC, and COSCO Shipping, offering both full container and consolidated container options. We handle all export procedures including customs declaration and origin certification issuance. Full scanned copies of customs documents will be provided within 3 working days after shipment. Bill of lading modification: One free amendment to bill of lading details is permitted within 7 days after vessel departure.
• Cargo damage handling: For full container shipments, goods must be inspected immediately upon unloading; for consolidated shipments, complete unloading videos must be recorded throughout the process. Any identified cargo damage shall be verified and addressed by reshipping the corresponding goods in the next order.

Q1: How do I confirm that OE-EG3501119 is compatible with my BYD F6?

A: All BYD F6 models (2007–2014, including the 2.0L BYD483QB and 2.4L Mitsubishi 4G69 engines) feature ventilated front disc brakes, with tire specifications of 205/65 R15 or 205/60 R16. The EG3501119 is manufactured using a 1:1 mold based on the original F6 factory drawings, with a friction surface diameter of 284mm, center bore diameter of 68mm, and a bolt pattern of 5×114.3mm. Before placing your order, please provide the last 8 digits of your VIN; we will issue a written compatibility confirmation letter within 24 hours.

Q2: Why is the "MIN THK" marking required on front brake discs?

A: This is a mandatory requirement under GB/T 34422-2017 *Automotive Brake Discs*: brake discs must display the minimum allowable thickness in a prominent location, with markings that are clear and permanent. For EG3501119, the minimum thickness is 22 mm, laser-engraved to a depth of 0.2 mm-remaining visible even as the disc wears-to help service technicians determine when replacement is necessary.

Q3: How is dynamic balancing ensured? What happens if the unbalance exceeds the limit?

A: Every EG3501119 unit undergoes 100% dynamic balancing inspection before leaving the factory (Equipment model: Schenck HV-300), with unbalance controlled at ≤15 g·cm. If unbalance exceeds the specified limit, the equipment automatically removes material from the lighter side of the rotor until it meets standards. Excessive unbalance can cause steering wheel vibration at high speeds (>80 km/h), compromising driving safety.

🔧 Selection Tips for Offline Stores and Repair Shops for Instant Application
Tip 1: Measure the Thickness of Vented Brake Discs and Watch Out for "Thinned-Down Discs"
Use a vernier caliper to measure the thickness of the friction surface of the BYD F6 front brake disc (avoiding the air ducts), with the standard value ranging from 24 to 26 mm. If the measured value is less than 24 mm, the disc is a downgraded version. Insufficient thickness reduces heat capacity, making thermal fade prone to occur during continuous braking. The EG3501119 maintains a thickness of 24.5–25.5 mm, providing ample safety margin.

Tip 2: Count the Number of Air Ducts to Judge Heat Dissipation Capacity
The original front disc of the F6 is designed with 18 axial air ducts. Shine a flashlight on the side of the disc for inspection and count the air ducts: if there are only 16, the heat dissipation area is reduced by 11%, and the disc surface temperature may rise by 50–80°C during high-speed braking. The EG3501119 strictly retains 18 air ducts each with a width of 8±0.2 mm to guarantee heat dissipation efficiency.

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