Front Brake Discs for CHEVROLET MD

This Chevrolet MD front brake disc corresponds to the original equipment manufacturer (OEM) part number OE-15253255; it is a heavy-duty ventilated brake rotor specifically engineered for the North American mid-size heavy-duty truck market. The component is cast using OEM drawings at a 1:1 scale; its hub mounting reference surface, bolt hole positions, and center alignment dimensions are fully aligned with those of the original OEM part. Therefore, truck repair shops can install and replace this disc directly without requiring any grinding, drilling, or the addition of gaskets.

This product is precisely engineered for the front wheel brake assemblies of Chevrolet's MD Series C4500 Kodiak (2005–2009) and C5500 Kodiak (2006–2009) medium-duty trucks; it is also compatible with the front wheel braking systems of the same platform's GMC MD C4500 and C5500 Topkick heavy-duty models, catering to the primary maintenance needs of construction vehicles, long-haul logistics trucks, and municipal engineering emergency repair vehicles in North America. The product features an integrated flow-directing blade ventilation structure, with a new disc's overall thickness of 39 mm, an original factory-mandated maximum wear limit of 36 mm, an outer diameter of 380.7 mm, a center mounting hole of 224.8 mm, 8 fixed bolt holes, and a pitch circle diameter of 275 mm-ensuring its suitability for heavy-duty load-bearing operating conditions. The base material utilizes high-grade HT250 pearlitic gray cast iron, featuring uniformly distributed and dense graphite particles, with a static friction coefficient maintained within the range of 0.39–0.43; the thermal fade rate during continuous braking under heavy-load conditions is controlled below 11%. Its internal directional airflow cooling capability significantly exceeds that of solid brake discs, effectively resolving common issues such as disc overheating deformation and brake softness caused by prolonged downhill driving and frequent braking in heavy-duty trucks.

Designed to withstand harsh operating conditions-including winter snowmelt salt corrosion in northern North America, high-salt marine transport at coastal ports, and rain-induced rusting at open-air construction sites-the OE-15253255 Chevrolet MD front brake disc lever harnesses cutting-edge technology to provide comprehensive protection. This product innovatively applies a protective coating exclusively to non-friction areas, while retaining the original cast iron material on the braking friction surface; this approach ensures optimal braking engagement performance while simultaneously constructing a multi-layered anti-corrosion barrier through a three-tier gradient composite anti-rust spraying process. All performance specifications are based on actual test data, eschewing vague marketing claims in favor of precise technical explanations and a durable commitment rooted in human-centric care, thereby delivering users a safe and reliable driving experience.
The base layer utilizes a nano-phosphating conversion coating; after undergoing ultrasonic degreasing and rust removal treatment, a low-temperature phosphating process is performed to form the coating. The coating thickness is controlled at 3–5 μm, which thoroughly seals the fine capillary pores on the cast iron surface, achieving a 0-grade adhesion rating according to the 100-grid scratch adhesion test, ensuring the coating remains stable and does not peel off, thereby establishing a solid foundation for the subsequent anti-corrosion paint layer.

The intermediate layer utilizes a high-voltage electrostatic spraying process to form a zinc-aluminum flake cathodic anti-corrosion primer; the dry film thickness is 20 ± 2 μm. The flake-shaped zinc-aluminum raw materials are interlaced to construct a labyrinth-style water-blocking layer, which effectively prevents the penetration of water vapor and salt ions; even in the event of localized impacts during transportation, the zinc material can protect the substrate through the cathodic sacrificial principle, thereby preventing the spread of rust spots. The surface layer is coated with a 10 ± 2 μm thick silicone-based high-temperature resistant topcoat; after curing, this coating can withstand short-term exposure to 350°C without cracking or blistering, further sealing the pores of the primer and enhancing the overall water-blocking and salt spray resistance of the product. According to the ASTM B117 neutral salt spray test standard, after undergoing 10 cycles of high-temperature and low-temperature thermal cycling at 300°C, the sample still maintained no red rust formation for 960 hours-representing a fourfold improvement over the typical 240-hour salt spray life of conventional single-layer black brake discs available on the market. This effectively resolves the issue of wheel hub rusting and jamming caused by high-humidity environments during long-distance maritime transport or prolonged use on salt-sprayed roads in winter, demonstrating the superior durability value of this product through these outstanding performance metrics.

Compatible Vehicle Models

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

Cross Reference Part Number Table

Chevrolet MD front brake discs: The entire production process adheres to proprietary quality control standards; the precision machining area is located within a sealed workshop maintained at constant temperature and humidity-specifically, 20 ± 1°C and 45%–55% relative humidity-to eliminate thermal expansion and contraction errors inherent in cast iron, ensure dimensional consistency across the same batch, guarantee precise screw alignment during assembly, and achieve seamless fit between the wheel hubs.

Core equipment: CNC machining center equipped with a counterweight hydraulic fixture; enables single setup to complete the precision turning of the disk surface, boring of the center hole, drilling and chamfering of the bolt holes, and milling of the mounting surface, with a single-piece cycle time of 48 seconds, thereby reducing cumulative errors resulting from multiple setups.

The dynamic balancing process utilizes a Shanghai Shenji vertical testing instrument with a minimum accuracy of 0.1 g·cm, and a final residual imbalance of ≤ 0.3 g·cm/kg (exceeding the 0.5 limit specified in the national standard GB/T 9239), thereby effectively eliminating high-speed braking vibration and pedal bounce.

The Tier-3 sampling inspection system (comprising 8 specialized quality inspection stations) includes a first-piece full inspection: for every batch or mold change, the first-piece sample shall undergo a full inspection of 16 key dimensions using a bridge-type three-dimensional coordinate measuring machine; mass production may only commence after all specifications are met.

Process inspection: For every consecutive batch of 50 parts processed, randomly select one part to verify that the disc thickness difference (DTV) is ≤ 0.009 mm and the end face runout is ≤ 0.05 mm, thereby preventing uneven wear and vibration.

Finished product sampling inspection: After anti-corrosion spraying, coat thickness, salt spray corrosion resistance, burrs, and scratches shall be sampled at a rate of 10%; any batch that fails these tests shall undergo full rework and shall not be accepted for warehousing.

Implementing a pre-processing quality control system: for each batch of cast iron entering the plant, carbon, silicon, manganese, and sulfur contents are measured using a direct-read spectrometer; material specifications are strictly controlled to eliminate cracking and insufficient rigidity issues at the source.

The entire process is self-contained with zero external outsourcing, real-scenario-based control, and traceable data.

This integrated solution for the OE-15253255 Chevrolet MD brake rotor is designed for overseas truck parts wholesalers, chain auto repair shops, and cross-border auto parts purchasers, providing a full-chain traceable delivery, warehousing, and after-sales service package; the terms are clear and easy to understand. Warranty and After-Sales Terms: The warranty period begins on the day the customer receives the goods and covers either a 12-month or an 80,000-kilometer dual-limit warranty; whichever condition is met first will terminate the warranty. Product Packaging Details: Each individual Chevrolet MD front brake disc is first fully wrapped in thickened OPP pearl cotton to protect the disc's edges from bumps, scratches, or friction during transit; a waterproof PE sealing bag is used as the outer layer to block moisture; the outer packaging consists of a five-layer thickened corrugated cardboard box, with foam corner guards installed at all four corners to prevent the box from being crushed or deformed; for bulk shipments, all units are packaged uniformly using solid wood fumigated pallets, secured with a continuous waterproof stretch film wrap on the exterior; these pallets can then be directly loaded into containers for sea freight.

Q1: Which specific truck years and models is this OE-15253255 Chevrolet MD front brake disc compatible with?
A: The Chevrolet MD front brake disc is compatible with the front-wheel braking system of the Chevrolet C4500 Kodiak (2005–2009) and C5500 Kodiak (2006–2009) medium-duty heavy-duty trucks; it also applies to GMC MD C4500 Topkick and C5500 Topkick models on the same platform-allowing for a direct replacement without any modifications.

Q2: How can I confirm whether my existing brake discs can be directly replaced with the OE-15253255 product?
A: There are two verification methods: first, check the part number engraved on the side of the old brake disc; if the number 15253255 appears, the components can be directly swapped; second, perform a physical measurement of the key dimensions: outer diameter 380.7 mm, total thickness 39 mm, 8 mounting fixing holes, and a center positioning hole of 224.8 mm; if these dimensions match, the parts can be installed on the vehicle for use.

New regulations for commercial vehicle braking components have been implemented in North America: the U.S. FMVSS 126 braking standards will be upgraded in 2026, introducing new high-temperature deformation testing requirements for brake discs used in medium-duty and heavy-duty trucks. After three consecutive extreme braking cycles, the face runout of the brake disc must not exceed 0.06 mm. Low-quality cast brake discs are highly prone to deformation and failure, making high-precision machined heavy-duty brake discs a mandatory requirement for repair shops.

The EU's ECE R90 certification now includes additional corrosion resistance assessments: commercial vehicle braking rotors exported to the EU must undergo a salt spray test after a high-temperature cycling process, with the requirement that no red rust appears for at least 480 hours. Single-layer black-painted brake discs cannot pass the certification and customs clearance process, making multi-layer composite corrosion-resistant components the standard equipment for international trade.

Additionally, traceability controls for engineering vehicle components in North America have tightened: automotive repair shops across U.S. states are required to engrave the OE part number, production batch, and wear limit thickness on replaced commercial vehicle brake discs. White-brand brake discs without such markings are prohibited from being used in the maintenance of commercial trucks; consequently, certified, labeled OEM-specified components continue to see steadily increasing sales.

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