{"product_id":"dynamite-friction-631-31030l-disc-brake-rotor-rear-left","title":"Dynamite Friction 631-31030L Disc Brake Rotor - Rear Left","description":"\u003ch2\u003eOverview of the DFC Brake Rotor - Drilled and Slotted - Silver\u003c\/h2\u003e\u003cp\u003eThe Dynamite Friction DFC Brake Rotor - Drilled and Slotted - Silver (part number 631-31030L) is engineered for BMW models including the 740i, 740iL, 840Ci, 850Ci, 850CSi, and 850i. This solid disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with BMW 740i, 740iL, 840Ci, 850Ci, 850CSi, and 850i\u003c\/li\u003e\n\u003cli\u003ePart Number: 631-31030L\u003c\/li\u003e\n\u003cli\u003eSolid rotor with drilled and slotted surface for improved heat management\u003c\/li\u003e\n\u003cli\u003eNominal thickness of 12 mm and discard thickness of 10.4 mm\u003c\/li\u003e\n\u003cli\u003eZinc silver hat finish with rust-resistant coating\u003c\/li\u003e\n\u003cli\u003eDirectional brake surface for optimized braking efficiency\u003c\/li\u003e\n\u003cli\u003e5 bolt holes with 15 mm diameter and 120 mm bolt circle diameter\u003c\/li\u003e\n\u003cli\u003eOverall diameter of 324 mm and height of 61.1 mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Line Details\u003c\/h2\u003e\u003cp\u003eThe DFC Brake Rotor - Drilled and Slotted - Silver line by Dynamite Friction focuses on rotors that combine drilled holes and slots to provide consistent brake pad contact and effective heat dissipation. This design helps reduce brake fade and maintain performance under demanding conditions. The silver zinc coating on the rotor hat offers corrosion resistance, extending the rotor's service life.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications and Features\u003c\/h2\u003e\u003cp\u003eThis disc brake rotor is a solid type with a nominal thickness of 12 mm and a discard thickness of 10.4 mm, ensuring reliable durability and safety margins. The rotor's surface is both drilled and slotted, which aids in removing brake dust and gases, improving braking response. The rotor features a directional surface type, which means it is designed to rotate in a specific direction for optimal performance. The zinc silver finish on the hat provides rust resistance, helping to maintain structural integrity over time. The rotor includes five bolt holes with a diameter of 15 mm and a bolt circle diameter of 120 mm, matching the stud\/lug hole pattern of the specified BMW models.\u003c\/p\u003e\u003ch2\u003eApplications and Problem Solving\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplaces worn or warped rotors on BMW 740i, 740iL, 840Ci, 850Ci, 850CSi, and 850i\u003c\/li\u003e\n\u003cli\u003eAddresses brake fade caused by excessive heat buildup during aggressive driving\u003c\/li\u003e\n\u003cli\u003eImproves braking consistency by reducing brake dust accumulation\u003c\/li\u003e\n\u003cli\u003eHelps eliminate vibration and noise associated with uneven rotor surfaces\u003c\/li\u003e\n\u003cli\u003ePrevents rust and corrosion on rotor hats for longer service life\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eEnsure the rotor is installed with the directional surface facing the correct rotation direction as indicated on the rotor. Verify that the bolt hole pattern matches the vehicle’s hub (5 holes, 15 mm diameter, 120 mm bolt circle). Measure rotor thickness before installation to confirm it meets or exceeds the discard thickness of 10.4 mm. Clean the rotor surface to remove any protective coatings or contaminants before mounting brake pads. Proper torque specifications should be followed when tightening lug nuts to avoid rotor warping.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eDynamite Friction manufactures the 631-31030L rotor to meet OEM standards for fitment and performance on BMW 7 and 8 Series models. The rust-resistant zinc silver coating and solid rotor construction contribute to durability and reliability. While no specific warranty information is provided, the rotor is designed to maintain consistent braking performance within the specified thickness limits.\u003c\/p\u003e","brand":"Dynamite Friction","offers":[{"title":"Default Title","offer_id":51794113822901,"sku":"HBHR-631-31030L","price":106.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DF_63131030L_Fro.jpg?v=1774641350","url":"https:\/\/www.partcatalog.com\/products\/dynamite-friction-631-31030l-disc-brake-rotor-rear-left","provider":"PartCatalog","version":"1.0","type":"link"}