Commercial Vehicle Brake Discs: Engineering Specifications, B2B Procurement & Global Sourcing

Our heavy-duty commercial vehicle brake discs are produced exclusively from high-carbon flake graphite cast iron conforming to EN-GJL-250 (GG25Cr) specifications. This alloy features carbon content of 3.2% - 3.5%, silicon of 1.6% - 2.0%, and trace chromium additions (0.2% - 0.4%) to increase pearlitic stability and tensile performance up to 250 MPa. This metallurgical composition prevents premature thermal checking under severe downhill braking.

Every disc is cross-referenced using original equipment technical drawings. We record and confirm critical physical properties before production: disc outer diameter (such as Ø430 mm or Ø377 mm), friction ring nominal thickness (typically 45 mm with minimum discard thickness marked at 37 mm), total disc depth, centring hole diameter, and the exact bolt pitch circle diameter (PCD). ECE R90 homological testing certifies that our disc friction coefficients and mechanical damping match OE counterparts within strict ±10% margins.

We operate with high commercial flexibility. Standard fast-moving items (e.g., Actros Ø430 mm or BPW Eco Plus trailer discs) can be ordered on a single-pallet basis (typically 20 to 30 discs per pallet). For customized private-label brand packaging or special cast tooling, batch runs usually begin at 100 to 200 units. Sourcing can also be consolidated with our other heavy chassis components like wheel hubs and air springs to maximize container payload weight.

Unprotected gray cast iron oxidizes rapidly in ocean transit environments. We offer dual anti-rust strategies: high-performance water-based zinc-aluminum or GEOMET grey protective coatings that can be installed directly out of the box without solvents, or traditional dry VCI (Volatile Corrosion Inhibitor) foil encasement with silica desiccant bags. Pallets are plastic shrink-wrapped and strapping-reinforced on ISPM-15 heat-treated timber.

Yes. Private label programs are a core strength. We provide custom edge-laser marking with your brand logo, batch trace code, part number, minimum thickness (Min Th mm), and ECE R90 approval numbers. We also manufacture full-color custom retail cartons, customized outer labeling with EAN-13 barcodes, and specialized pallet corner guards tailored to your brand identity.

Every export shipment includes a commercial invoice, detailed packing list specifying gross and net weights, Bill of Lading (or CMR for road shipments), and an official Certificate of Origin. For buyers within the European Union, we supply an A.TR Movement Certificate enabling zero customs duty clearance. EUR.1 documents can also be arranged for countries holding bilateral free trade agreements with Türkiye.

Thermal disc warping is eliminated at the foundry stage through controlled cooling rates that relieve internal residual stresses before final turning. Subsequently, automated twin-lathe CNC machining processes both contact faces simultaneously, securing non-parallelism tolerances within 15 microns. Dynamic balance certification prevents eccentric rotating mass that triggers hot spots and DTV wear patterns.

Yes, consolidated multi-category sourcing is one of KNB Automotive's primary competitive advantages. Brake discs are heavy and can rapidly max out trailer and container weight capacity. By combining dense brake rotors with high-volume, low-density parts such as air springs, mirrors, clutch servos, and lighting kits, we optimize your freight cube and curb your landed freight cost per kilogram.