{"product_id":"raybestos-982121r-disc-brake-rotor","title":"Raybestos 982121R Disc Brake Rotor - Front","description":"\u003ch2\u003eOverview of Raybestos R-Line Disc Brake Rotor 982121R\u003c\/h2\u003e\u003cp\u003eThe Raybestos R-Line Disc Brake Rotor 982121R is engineered for reliable braking performance on select Mercedes-Benz models. Designed as a vented, conventional rotor, it offers consistent heat dissipation and durability for vehicles like the GL350, GL450, and ML350.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with Mercedes-Benz GL350, GL450, GLE400, GLS350d, GLS450, ML350, and ML400\u003c\/li\u003e\n\u003cli\u003ePart number 982121R ensures precise fitment and quality\u003c\/li\u003e\n\u003cli\u003eVented disc brake rotor design for improved cooling\u003c\/li\u003e\n\u003cli\u003eOverall height: 2.146 inches (54.5 mm)\u003c\/li\u003e\n\u003cli\u003eOutside diameter: 13.780 inches (350 mm)\u003c\/li\u003e\n\u003cli\u003eMounting bolt hole quantity: 5 with 0.600 inch (15.25 mm) diameter holes\u003c\/li\u003e\n\u003cli\u003eCenter hole diameter: 2.638 inches (67 mm)\u003c\/li\u003e\n\u003cli\u003eSmooth surface type for consistent pad contact\u003c\/li\u003e\n\u003cli\u003eNominal thickness: 1.260 inches (32 mm) with discard thickness at 1.158 inches (29.4 mm)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Raybestos R-Line 982121R disc brake rotor is a vented, conventional rotor designed to meet the braking demands of various Mercedes-Benz SUVs and crossovers. Its vented construction allows for enhanced heat dissipation during braking, reducing the risk of brake fade under heavy use. The rotor features a smooth surface type that promotes even brake pad wear and consistent stopping power. With an outside diameter of 13.780 inches (350 mm) and an overall height of 2.146 inches (54.5 mm), this rotor fits vehicles requiring a 5-bolt mounting pattern with a 4.409 inch (112 mm) bolt circle diameter. The nominal thickness of 1.260 inches (32 mm) ensures structural integrity, while the discard thickness of 1.158 inches (29.4 mm) indicates when replacement is necessary to maintain safe braking performance.\u003c\/p\u003e\u003ch2\u003eAbout the Raybestos R-Line Product Line\u003c\/h2\u003e\u003cp\u003eThe R-Line by Raybestos is a product line focused on delivering reliable, OE-quality brake components for a range of vehicles. This line emphasizes precise fitment and consistent performance, making it suitable for drivers who require dependable braking without extensive modifications. The 982121R rotor exemplifies the R-Line’s commitment to quality through its vented design and adherence to strict dimensional specifications.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Problem Solving\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacement for worn or warped rotors on Mercedes-Benz GL350, GL450, GLE400, GLS350d, GLS450, ML350, and ML400\u003c\/li\u003e\n\u003cli\u003eAddresses brake noise and vibration caused by uneven rotor surfaces\u003c\/li\u003e\n\u003cli\u003eImproves braking consistency by restoring proper rotor thickness and surface smoothness\u003c\/li\u003e\n\u003cli\u003eHelps prevent brake fade during extended or heavy braking conditions\u003c\/li\u003e\n\u003cli\u003eResolves fitment issues related to bolt hole pattern and rotor dimensions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eVerify rotor thickness before installation; replace if below discard thickness of 1.158 inches (29.4 mm)\u003c\/li\u003e\n\u003cli\u003eEnsure mounting surfaces and bolt holes are clean and free of debris\u003c\/li\u003e\n\u003cli\u003eTorque mounting bolts to manufacturer specifications to avoid rotor warping\u003c\/li\u003e\n\u003cli\u003eInspect brake pads for wear and replace if necessary to ensure optimal rotor performance\u003c\/li\u003e\n\u003cli\u003ePerform a bed-in procedure after installation to maximize braking efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eRaybestos R-Line rotors, including part number 982121R, are manufactured to meet or exceed OEM specifications for fit, form, and function. The vented rotor design and precise machining contribute to consistent braking performance. While specific warranty details may vary, Raybestos products typically come with a limited warranty against defects in materials and workmanship, providing confidence in product reliability.\u003c\/p\u003e","brand":"Raybestos","offers":[{"title":"Default Title","offer_id":44478321131701,"sku":"BDBL-982121R","price":83.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/RS_982121R_Fro.jpg?v=1774637384","url":"https:\/\/www.partcatalog.com\/products\/raybestos-982121r-disc-brake-rotor","provider":"PartCatalog","version":"1.0","type":"link"}