Front Brake Discs for Kia Carens

This dedicated front brake disc for the Kia Carens, model OE-517121F300, is specifically designed for the UN-generation Carens and also compatible with the same model year of the North American Kia Rondo. As a front-axis-specific replacement component, it perfectly matches the 2.0L gasoline versions produced from 2006 to 2012 and fully aligns with the parameters of the original factory braking system. Essentially, it serves as a certified aftermarket replacement part identical to the original specification, featuring a ventilated disc structure with a diameter of 280 mm and thickness of 26 mm. All four mounting holes and the central positioning groove are precision-machined according to original factory drawings, eliminating the need for drilling or grinding – installation is straightforward and convenient. Manufactured from high-carbon gray cast iron with a carbon content ranging between 3.2% and 3.5%, this disc exhibits significantly superior thermal stability compared to conventional cast iron, ensuring reliable braking performance even under frequent braking conditions, whether during daily city commuting or long-distance highway drives.

As you can see, to address the complex and changing driving conditions across various overseas environments, this Kia Carens front brake disc (OE number 517121F300) features an upgraded three-layer anti-rust coating on its non-friction surfaces. From the cast iron substrate to the outer paint layer, a robust corrosion-resistant barrier is built up layer by layer, providing significantly superior overall protection compared to brake discs with conventional simple coatings. Even under prolonged exposure to harsh outdoor conditions, it is unlikely to develop extensive rust, paint peeling, or chipping.

The first layer is a zinc-based phosphating pretreatment layer. Through a specialized phosphating reaction at room temperature, a dense and fine protective crystalline film forms on the surface of the cast iron substrate of the brake disc, effectively removing processing residues such as oil contaminants and surface oxidation impurities while thoroughly cleaning the substrate. Additionally, it creates a unique micro-anchoring structure that firmly bonds with subsequent coatings, significantly enhancing overall paint adhesion and preventing paint detachment or peeling at the source.

The second layer consists of a zinc-rich epoxy primer with high zinc content, forming a thick and uniformly distributed coating made from robust materials. Leveraging the unique cathodic protection mechanism inherent to zinc-based materials, even if the surface paint sustains minor damage from road abrasions or impact, it continues to provide effective protection by actively delaying and preventing the spread of corrosion from the substrate, thereby avoiding the progression of small damages into extensive rusting issues.

The third layer is a weather-resistant water-based UV topcoat. After curing under ultraviolet light, it forms a dense, hydrophobic protective surface with excellent resistance to acids, alkalis, and aging, effectively shielding against impact from road debris and various environmental corrosive agents. Certified by independent authoritative laboratories, this non-friction working surface on the front brake disc of the Kia K5 demonstrates stable and outstanding rust prevention performance, showing no signs of red rust even after prolonged use. It is perfectly suited for demanding overseas driving conditions-including humid rainy seasons in Southeast Asia, coastal areas with high salt fog, and winter snowmelt-induced salt-corrosion surfaces-and performs reliably under most complex operating environments worldwide.

Compatible Vehicle Models

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

Cross Reference Part Number Table

The front brake discs for the Kia Carens, model 517121F300, are entirely manufactured at our own facility in Laizhou, Shandong Province using a standardized CNC machining shop. The workshop is equipped with 12 Mazak horizontal CNC machining centers, employing a "single-chip setup, full-process completion" approach-where disc surface machining, installation hole drilling and reaming, and center stop processing are all performed within a single setup, eliminating dimensional variation caused by repeated setups. The entire machining process is monitored by a closed-loop CNC system, with cutting parameters pre-set according to OEM standards by process engineers; each disc's machining time is precisely controlled at 112 seconds, ensuring consistent dimensions across the same batch. For finished products, disc thickness variation (DTV) remains below 0.009 mm throughout production, lateral runout does not exceed 0.05 mm, and friction surface roughness is maintained at Ra ≤ 1.6 μm. When installed on vehicles, these discs exhibit superior brake engagement performance, effectively preventing issues such as vibration during acceleration or high-speed operation.

For quality control, we have established five mandatory inspection checkpoints covering the entire process from raw material to finished product: Upon arrival at the factory, raw materials undergo spectral composition analysis to ensure the material composition of high-carbon gray iron meets the formulation standards; after rough machining, metallographic examinations are conducted to assess graphite morphology and matrix strength; following precision machining, all products must pass dynamic balancing tests with residual imbalance strictly controlled within 5 grams per centimeter; post-coating, each batch undergoes coating adhesion grid testing, requiring compliance with Grade 0 standards before proceeding; prior to shipment, every finished product is individually verified for mounting hole dimensions and disc runout values. All inspection data is synchronized into the factory's MES system, enabling full traceability for each batch of Kia Carens front brake discs (model 517121F300) down to the respective production team, equipment identifier, and complete test report.

1. Which model years and engine displacements of Kia Carens does this brake disc with part number 517121F300 specifically fit?
Answer: This front brake disc for Kia Carens precisely fits the front axles of the 2006-2012 Kia Carens UN series models equipped with the 2.0L gasoline engine. It is also compatible with the corresponding model years of the Kia Rondo built on the same platform for the North American market. It serves as a replacement for the original equipment (OE) part numbered 517121F300, featuring installation dimensions identical to the original part at a 1:1 ratio with no fitting discrepancies.

2. Can this front brake disc with part number 517121F300 fit the earlier 2005 Kia Carens? Are there any differences in the bolt circle diameter among different model years?
Answer: Cross-generation compatibility is not recommended. This Kia Carens front brake disc 517121F300 is exclusively engineered for the UN generation models produced from 2006 to 2012. It features a bolt circle diameter of 5×114.3mm and a center bore diameter of 67.1mm, whose specifications do not match those of the earlier first-generation Carens models. Forced installation will lead to issues such as misaligned center bore and interference between the disc surface and calipers, posing potential safety hazards. Be sure to verify the original OE number and vehicle chassis code before placing an order, and using the part number 517121F300 as the definitive compatibility reference is the most reliable approach.
Full-case wholesale orders: The standard production cycle is 25–35 days; during peak seasons, priority production scheduling ensures timely delivery. Regular wholesale customers receive a warranty covering 18 months or 60,000 kilometers. The warranty covers manufacturing defects such as abnormal thermal cracks on the surface, excessive wear, and large-scale peeling of non-friction surfaces; damage caused by normal wear, improper installation, or modification is not covered.

The current regulatory landscape for the global automotive brake components industry essentially reflects increasingly stringent standards in both environmental protection and performance requirements. In the EU, with the implementation of Euro 7 emission regulations, stricter limits have been imposed on dust emissions and heavy metal content in brake components; brake discs containing heavy metals such as lead or cadmium are gradually being prohibited from entering the EU market. Countries in Southeast Asia, including Thailand and Indonesia, are also tightening import thresholds for automotive parts, mandating that brake components provide performance certifications and environmental compliance documentation-making it increasingly difficult to clear customs for uncertified bulk shipments.

Furthermore, consumer demands in the overseas after-sales market are evolving. An increasing number of repair shops and vehicle owners now prefer brake replacement parts with longer lifespans and lower failure rates rather than focusing solely on cost-effectiveness. Based on practical selection considerations for offline auto parts stores and repair shops, and specifically regarding the Kia K5 front brake disc 517121F300, here are three practical recommendations:

First, when selecting a model, prioritize verifying the OE number rather than relying solely on the year and model code. For the same vehicle, brake disc dimensions may vary across different batches or configurations; the OE number provides the most reliable compatibility reference-517121F300 corresponds to the front axle of the Kia K5 UN generation, ensuring complete avoidance of mismatches.

Second, in humid and coastal regions, products with multi-layer anti-corrosion coatings should be prioritized. Conventional brake discs coated with standard paint typically develop edge rust within 3 to 6 months under coastal salt spray and rainy-season humidity conditions; however, the Kia K5 front brake disc 517121F300 with a three-layer composite coating extends its rust resistance by more than three times, significantly reducing after-sales complaints.

Third, in high-frequency braking scenarios, high-carbon brake rotors should be prioritized. For vehicles frequently used on highways or mountain roads, ordinary cast iron brake discs are prone to thermal deformation and vibration after repeated braking. In contrast, high-carbon materials exhibit a higher thermal fatigue threshold and superior resistance to deformation, significantly enhancing braking stability-making them ideal as premium replacement components for automotive dealerships.

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