Front Brake Disc for HYUNDAI Meiji

Note: If you take your vehicle for maintenance someday and the technician measures with a caliper and finds the thickness is less than 22.4mm, do not hesitate over the labor fees. Replace it immediately without delay, for this is a critical safety line that could save lives.

Real-world experience: When driving in stop-and-go city traffic, the brake pedal feels firm with no sponginess at all.

This brake disc is not designed for extreme off-roading or high-temperature conditions on racetracks. Instead, it excels at delivering smooth braking performance and suppressing brake noise during low-speed daily urban driving. On city roads with frequent traffic lights, when you lightly rest your foot on the brake pedal, the brake pads engage the disc in an extremely progressive manner. Thanks to the precise factory tolerances of the disc, there is no annoying high-pitched squealing when braking - an awkward scenario no driver wants to face while waiting at a red light with the window down and drawing strange looks from nearby vehicles.

Despite its unassuming performance in daily use, it rises to the occasion in emergencies such as sudden hard braking by the vehicle ahead. Boasting a large diameter of 257mm and a thickness of 24mm, the disc instantly converts kinetic energy into heat, which is then rapidly dissipated through its internal ventilation grooves. Even when the disc becomes scorching hot and slightly discolored blue, it will not suffer immediate brake fade or a spongy pedal feel. For family cars, this combination of comfortable daily driving and reliable emergency braking is exactly what most drivers prefer.

The front brake disc, model HYUNDAI 517122D300, is compatible with a wide range of cars, as follows:

There are different corresponding codes for the front brake disc of HYUNDAI 517122D300.

Many people who buy new brake rotors see the glossy black coating on them and immediately wonder: "Will this paint wear off as soon as I hit the brakes?" This concern is quite reasonable. However, the coating on the non-friction surfaces of our 517122D300 brake rotor is nothing like regular paintwork.

This fully enclosed protective layer adopts water-based eco-friendly UV curing coating technology. To put it simply, the brake rotor is sent to a fully automatic spraying production line and goes through a series of processes including preheating, electrostatic spraying and instant curing under high-temperature ultraviolet light. All these procedures are automatically controlled by computers, eliminating uneven coating caused by manual operation errors.

This UV coating contains no volatile organic compounds (VOCs), and its corrosion resistance in the salt spray test exceeds the standards set by most vehicle manufacturers.

What exactly are the advantages of this coating? Firstly, it resists peeling and blistering. During normal braking, the coating on friction surfaces will be naturally worn away by brake pads within the first few stops, while the coating on the rotor hat and edges stays firmly bonded to the metal surface, protecting these areas from rust all year round. Secondly, it boasts excellent stone chip resistance. When hit by small stones while driving on highways, ordinary paint will chip off easily and lead to rusting, yet this UV coating features superior hardness and toughness. Thirdly, it is environmentally friendly. Compared with traditional solvent-based spray painting, the UV curing process can cut energy consumption and carbon emissions by up to 98%. Choosing a premium set of brake rotors is not only a guarantee for your driving safety, but also a contribution to environmental protection.

Key point: Many low-cost brake rotors only apply a thin layer of paint on visible surfaces as a perfunctory treatment. Our product features penetrating coating protection even inside the ventilation grooves. The parts hidden from sight are where the true quality gap lies.

A brake disc may look like a simple chunk of metal, yet it involves sophisticated craftsmanship. Our Front brake disc for HYUNDAI Meijia517122D300 are manufactured via a fully automated casting and machining production line, from molten iron to finished products.
Casting Process
The brake disc blanks are made of gray cast iron with precisely controlled carbon content. Its metallographic structure requires a high pearlite proportion. This ensures the disc boasts sufficient hardness to resist wear while avoiding brittleness and thermal cracking.
Most small domestic manufacturers still rely on manual mold making. The cast blanks from such processes have rough surfaces and are prone to internal shrinkage porosity and air holes. Once installed on vehicles, uneven grooves will appear on the disc surface after just a few thousand kilometers of driving. In contrast, our production line uses robotic arms for automatic molten iron pouring and automated slag removal during smelting. All process parameters of every procedure are monitored by computers in real time.

Machining Process
After casting, the blanks proceed to precision machining. Turning, drilling and milling are all performed by CNC equipment. Dynamic balance inspection, the most critical step, is conducted for 100% of all products.
It is impossible for a brake disc to maintain perfect 360-degree natural balance after casting, as tiny mass eccentricity is inevitable. Without correction, the steering wheel will vibrate violently once the vehicle speed exceeds 80 kilometers per hour. Our production line uses dynamic balancing machines to automatically detect unbalanced areas and precisely mill off a small portion of material at targeted positions, until the disc runs smoothly at any rotation angle. Every brake disc undergoes nearly 20 rigorous inspections before delivery, with full traceability covering all stages from raw materials to finished goods.

Spraying Process
Qualified machined parts are transferred to the fully automatic spraying line. Loading, unloading, preheating, spraying, baking, cooling, rust prevention and air drying are completed in one continuous unmanned operation.
Robotic spraying delivers more than just high efficiency. Most importantly, it achieves coating uniformity at the micrometer level, eliminating common defects of manual spraying such as sagging, missing spray areas and uneven coating thickness. These unseen investments in automation translate into superior product performance: smooth and glossy coatings, stable disc precision, and trouble-free operation right after installation on vehicles.

This brake disc is covered by a manufacturer's warranty for 80,000 kilometers or 12 months. The warranty covers casting defects and surface coating issues, including but not limited to abnormal fractures caused by internal shrinkage porosity and air holes in the disc body, as well as abnormal coating peeling under normal operating conditions. Damage resulting from improper installation, such as incorrect bolt torque, unlubricated floating pins and wrong mounting direction of brake pads, is not covered by the warranty.

Delivery Instructions
The Front brake disc for HYUNDAI Meijia517122D300 compatible with Hyundai Elantra and other vehicle models weighs approximately 5.5 kilograms per piece. It is packed with double-layer OPP pearl cotton for cushioning during delivery to prevent bumps and scratches in transit. The standard production and delivery lead time is 30 to 45 working days after order confirmation, and goods will be shipped directly from the warehouse of our factory in Shandong. Express air freight is available for urgent orders with additional freight charges. We accept designated freight forwarders notified in advance by customers. Please provide the contact information of the freight forwarder within 72 hours after order confirmation.

After-sales Support and Quality Assurance
Every 517122D300 brake disc undergoes 100% dynamic balance testing and nearly 20 quality inspection procedures before leaving the factory. Key dimensions are strictly controlled within the following tolerances:
- Diameter tolerance: ±0.1mm
- Standard thickness tolerance: ±0.05mm
- Lateral runout of the disc surface: ≤0.05mm

If casting defects, dimensional deviations or abnormal coating conditions are found on the disc surface, please submit clear photos as evidence before installation. We will provide a solution within 48 hours, including product replacement or full refund.

Q: This disc looks quite heavy. Can it really be fitted to the old Hyundai Elantra?

A: Rest assured, it fits perfectly. The Front brake disc for HYUNDAI Meijia517122D300 is designed for the front wheels of the 2001-2006 Hyundai Elantra. It is fully compatible with OEM parts numbered 5171217000, 517122D310, 5171238100 and more, enabling a direct, non-destructive replacement. With an outer diameter of 257mm and a center bore of 69mm, it matches the original caliper bracket precisely. One key reminder during installation: after removing the old disc, thoroughly clean rust off the hub contact surface with a wire brush before mounting the new one. Otherwise, residual rust will cause excessive lateral runout of the disc, leading to steering wheel vibration at high speeds.

Q: Why is there a black coating on the edge of the disc? Will it produce unpleasant odors?

A: This is not ordinary paint, but the UV-cured coating we mentioned earlier. Applied via automatic spray lines through preheating, electrostatic spraying and instant UV curing, the coating bonds firmly with the metal substrate. The coating on the disc will be completely worn off by the brake pads after the first few stops with a new vehicle, leaving no lingering odors. The burning smell you may notice usually comes from resin volatilization of new brake pads during the running-in period, which has nothing to do with the disc coating. The smell will disappear completely after driving 200 to 300 kilometers.

Q: What is the most reliable way to regularly inspect the brake disc with part number 517122D300?

A: No professional equipment is required. Just check the following simple indicators. Thickness: Measure with a vernier caliper. Replace the disc immediately if the thickness drops below 22.4mm. Groove depth: Run your fingers over the disc surface. Replacement is recommended if the groove depth exceeds 0.5mm. Lateral runout: Obvious vibration of the steering wheel or brake pedal during medium and high-speed braking indicates disc deformation or excessive lateral runout, and the disc should be replaced right away. Rust: Light surface rust on the edges and ventilation slots is normal. However, replace the disc if rust pits on the surface go deeper than 1mm, or if rust significantly reduces the contact area with brake pads. For older models like the Hyundai Elantra, have a mechanic inspect the brake disc every 20,000 kilometers or during each oil change service. If you frequently drive on highways or mountain roads, shorten the inspection interval to 12,000 kilometers.

Tense Tips - How to Quickly Judge the "Condition State" of Brake Discs: We divide the conditions of brake discs into three states corresponding to past, present and future tenses.

Past State: Obvious circular grooves appear on the disc surface, which feel distinctly uneven when touched with fingers. This means hard foreign particles got mixed into the brake pads during past use.
Present State: The disc surface is smooth and even with no noticeable grooves, yet a step roughly 1 millimeter deep has worn along the edge. It indicates the brake disc is wearing normally at present. There is no need for an immediate replacement, but its thickness needs regular inspection.

Future State: Radial fine cracks (thermal cracks) emerge on the disc surface, especially around the ventilation holes. This suggests the disc material has suffered fatigue. If kept in use, the disc may crack at any time, which is the most dangerous condition. Once cracks are spotted, replace the brake disc without delay..

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