Dynamite Friction 604-40118 Disc Brake Rotor - Rear

Rear Brake Rotor for Ram Heavy Duty Trucks

The Dynamite Friction DFC GEOSPEC Coated Rotor, part number 604-40118, is a rear disc brake rotor built for Ram heavy-duty applications. It features a vented design with a 358 mm outside diameter, 34 mm nominal thickness, and 32.4 mm discard thickness for service-focused brake replacement.

Compatible With Ram 2500 and Ram 3500 rear brake applications, this rotor is sized for the rear axle and supports fitment across multiple Ram HD configurations. The coated surface helps protect exposed areas of the rotor from corrosion during normal use.

DFC GEOSPEC Coated Rotor Details

The DFC GEOSPEC Coated Rotor line is built around coated brake rotor construction for drivers who want a direct replacement rotor with attention to fit, finish, and corrosion resistance. Part number 604-40118 follows the listed OE-style dimensions, including an 8-bolt pattern, 16.8 mm bolt hole diameter, 123 mm inside diameter, and 125 mm height.

• Rear disc brake rotor for Ram heavy-duty trucks
• Vented rotor design for rear axle brake service
• 358 mm outside diameter
• 34 mm nominal thickness
• 32.4 mm discard thickness
• 8 bolt holes with 16.8 mm bolt hole diameter
• DFC GEOSPEC coated finish for exposed-surface protection

Vehicle Fitment

• Fits 2011-2025 Ram 2500, rear
• Fits 2023-2025 Ram 3500, rear, 358mm rear disc
• Fits 2019-2022 Ram 3500, rear, brake hydraulic hose: SRW
• Fits 2019-2022 Ram 3500, rear, SRW; high output HD transmission; 12" rear axle
• Fits 2019-2022 Ram 3500, rear, SRW; standard output transmission; 11.5" rear axle
• Fits 2011-2018 Ram 3500, rear
• Fits 2011-2018 Ram 4000, rear
• Fits 2009-2010 Dodge Ram 2500, rear
• Fits 2009-2010 Dodge Ram 3500, rear

Common Brake Service Uses

• Rear rotor replacement for worn or below-spec brake discs
• Correction for brake pulsation caused by rotor wear or thickness variation
• Replacement for rusted or heavily corroded rear rotors
• Service part for Ram 2500 and Ram 3500 rear brake maintenance
• Restoration of proper rear braking surface during brake repair

Installation Notes and Tips

Verify rear axle configuration, brake package, and rotor dimensions before installation, especially on 2019-2022 Ram 3500 models with SRW and axle-specific notes. Confirm the rotor matches the vehicle’s rear brake setup, including outside diameter, bolt pattern, and height, before completing service.

Part number 604-40118 is a direct-fit style rear rotor for the listed Ram and Dodge Ram applications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Quality Assurance

Dynamite Friction’s DFC GEOSPEC Coated Rotor line is built to meet the dimensional requirements listed for the application and to provide a coated replacement rotor for rear brake service on Ram HD trucks.