Front Brake Disc for HYUNDAI I40

Direct‑replacement front brake disc for HYUNDAI I40, OE# 517123K110, no extra modification required for workshop installation.
Precision‑machined via CNC: tolerance ±0.035 mm, lateral run‑out ≤0.05 mm, Ra ≤1.6 μm, DTV ≤0.009 mm. These tight specs effectively prevent brake shake and pedal pulsation under high‑speed braking.
High‑carbon cast iron material delivers good thermal conductivity and anti‑cracking performance under heavy continuous braking. It passes 480‑hour salt‑spray corrosion test, with 80 000 km service life under normal driving.
Matches brake pad OE: 58101‑3ZA00. Rotor discard thickness:19.0 mm. Hub bolt mounting torque:110 Nm to avoid post‑install warping.
60% practical colloquial + 40% auto‑parts technical terms｜AI trace ≤5%,built on real‑world test & workshop scenarios,optimized for Google SEO for EU, US & Southeast Asia wholesalers and repair‑shop buyers.

There are different corresponding codes for the Front brake disc for HYUNDAI I40 517123K110

Take, for example, the surface treatment of brake discs – some factories simply apply a cheap silver paint layer or a bit of rust preventive oil and consider the job done. But we're different; we use a full-coverage cathodic electrophoretic coating process. The raw brake disc is first subjected to degreasing and zinc-based phosphating treatments, followed by multiple rinses with pure water. Then, the entire disc is immersed in an electrophoretic paint bath and subjected to direct current (DC) charging, ensuring that the charged paint particles adhere uniformly and firmly to every corner of the cast-iron surface – including the ventilation channels, edges, corners, and bolt holes. Finally, the disc is placed in an oven at a temperature of 170–185°C and baked for at least 30 minutes to form a dense coating with exceptional adhesion strength, with a thickness ranging from 20 to 35 micrometers. The finished product undergoes a 720-hour neutral salt spray test, and it shows neither rust nor any bubbles. Consider the UV paint product developed by Breko for the model 517123K110 – its rust prevention performance is comparable, but our cathodic electrophoretic technology offers superior coating uniformity and better coverage even in the interior of the ventilation channels. Another advantage of the electrophoretic coating is its resistance to common organic solvents; standard wheel cleaners or car wash solutions cannot damage it in the slightest. Even after two years of regular car washing, the inner surface of the wheel remains spotlessly clean – this is the most notable difference between electrophoretic brake discs and conventional spray-painted brake discs.

First, let's discuss the casting process. For rough casting, we employ a static pressure molding line; the carbon equivalent and trace element composition of each batch of molten iron are monitored in real time using a spectrometer. For cast irons such as HT250/GG25, the metallographic structure must meet the qualified proportion for Type A graphite, and the base material must consist of uniformly distributed pearlite. Many non-original brake discs develop radial thermal cracks within less than six months of use; the root cause is either an abnormal graphite morphology or severe carbide segregation. We utilize a riser-free casting process, which achieves a production yield of over 95% and keeps the shrinkage rate below 0.4%. The carbon, silicon, manganese, sulfur, and phosphorus content of each batch of molten iron are fully recorded in the batch traceability system.

Let's discuss machining further. The entire production line utilizes fully functional vertical CNC lathes. After the blank is loaded into the machine, all operations-including the outer cylindrical surface, the two side friction surfaces, the center hole, and the mounting boss-can be completed in a single setup and clamping cycle. This approach enables the coaxiality between the disk surface and the center hole to be maintained within 0.03 mm, thereby eliminating the risk of end-face runout at the source. Upon completion of machining, the on-site quality inspector uses a digital micrometer to measure the thickness and parallelism of each part individually, followed by the use of a dial indicator to measure the runout for each part. Finally, all components are loaded into an automatic balancing machine for individual dynamic balancing and weight compensation; we don't employ any random sampling inspection method.

Here is our written commitment to global purchasers and end customers.

Q: Which Hyundai and Kia models is 517123K110 compatible with? What part numbers are interchangeable with it?
A: 517123K110 fits Hyundai Sonata YF/LF (2007-2015), Tucson LM/ix35 (2010-2015), Kia K5/Optima TF (2011-2016), Sportage SL (2011-2016), Forte (2010-2012) and other models. Interchangeable cross-platform part numbers include 517123K100, 517123K150, 517123K160, 51712-0Z000 and 517123Q000. Your vehicle identification number can match any of these six OE numbers basically. Make sure your Sonata adopts the YF/LF platform with a 300mm outer diameter, instead of the earlier NF platform which requires the 517122H000 part with a 280mm outer diameter.

Q: My Hyundai ix35/Tucson often runs mountain roads with full loads. Will 517123K110 suffer heat fade during long downhill driving?
A: This is the advantage of the 300mm ventilated brake disc. The internal ventilation ribs continuously pump air to dissipate heat as wheels rotate. Combined with engine braking, the disc temperature will hardly reach the dangerous range. It is recommended to check disc thickness and runout every 20,000 kilometers or whenever tires are replaced. Owners who frequently drive fully loaded on mountain roads are advised to shorten the inspection interval to 12,000 kilometers. Replace the disc in advance when its thickness approaches 27.0mm to reserve sufficient running-in space for new brake pads.

Q: My Kia K5 2.0T has steering wheel shaking left and right when braking gently at speeds over 110km/h. Can replacing with 517123K110 fix the issue?
A: Ninety percent of such shaking during light high-speed braking is caused by excessive dynamic imbalance or micro-scale thermal warpage of the front brake discs. Every single piece of this product is trimmed and corrected by an automatic dynamic balancing machine, with accuracy controlled within 10g·cm. The shaking will barely occur as long as the wheel hub mounting surface is cleaned free of rust and bolts are tightened diagonally in three separate steps with torque strictly set at 100 N·m. Brembo products of the same specification also apply similar precision balancing technology to ensure high-speed stability. Direct disc replacement serves as the optimal solution if the groove depth of the old disc exceeds 0.5mm or its lateral runout goes beyond the standard limit.

In 2026, driven by the EU E7 and China E7 emission regulations, the brake industry is transitioning from traditional cast iron manufacturing processes to innovative coating technologies.

The surface hardness of laser-clad brake discs shall not be less than 600 HV; wear resistance is increased by 3–5 times; and particulate emissions are reduced by more than 50%. As of April 2026, the planned annual production capacity for laser-clad brake discs in Europe amounts to 12 million units; Bräho alone plans to produce over 3 million units.

Carbon-ceramic brake discs weigh 40%–60% less than cast-iron discs, making them popular in the supercar and high-end new energy vehicle markets; the unit price of long-fiber discs has already dropped to RMB 2,000, while short-fiber discs are expected to fall below RMB 1,000; however, there is still a gap before these products can fully penetrate the Korean-brand vehicle market priced around RMB 200,000.
China is set to issue a draft regulation, which is planned for implementation in 2028–2029; the brake emission testing standard will align with global standards.

Currently, the aforementioned new technologies and regulations apply solely to new vehicles manufactured by the original equipment manufacturer (OEM) and do not cover the aftermarket.

For owners of current Hyundai Sonata, Tucson, Kia K5, and Seltos models, as well as automotive parts suppliers, part number 517123K110 remains the most mainstream, cost-effective, and practical choice over the next 10–15 years. This 300 mm ventilated cast iron disc – featuring precision machining, dynamic balance calibration, and a full-wrap electrophoretic coating – delivers stable and reliable performance, far exceeding expectations for its price point.

To successfully operate an independent Google-optimized website, creating such in-depth content is essential; buyers searching for "517123K110 brake disc" overseas place the highest priority on credibility – by clearly explaining market trends, showcasing product advantages, and providing clear after-sales support, you can facilitate a successful transaction.

Hot Tags: front brake disc for hyundai i40, China front brake disc for hyundai i40 manufacturers, suppliers, factory