Raybestos 980427R Disc Brake Rotor - Front

Overview of Raybestos R-Line Disc Brake Rotor 980427R

The Raybestos R-Line Disc Brake Rotor 980427R is engineered for reliable braking performance on select Mercedes-Benz models. Designed as a vented, conventional rotor, it offers precise fitment and consistent stopping power for vehicles like the GL320, ML350, and R500.

• Vented disc brake rotor for improved heat dissipation
• Overall diameter of 12.992 inches (330 mm) for exact fit
• Nominal thickness of 1.260 inches (32 mm) with discard thickness at 1.157 inches (29.4 mm)
• Five mounting bolt holes with a 4.409 inch (112 mm) bolt circle diameter
• Center hole diameter of 2.638 inches (67 mm) for proper hub alignment
• Compatible with multiple Mercedes-Benz GL, ML, and R-Class models

Detailed Specifications and Features

This Raybestos R-Line rotor (part number 980427R) is a vented type rotor, which helps reduce brake fade by allowing better airflow and heat dissipation during braking. The rotor’s overall height measures 2.146 inches (54.5 mm), ensuring proper clearance and fitment within the brake assembly. With a solid construction and a conventional drum-in-hat design, this rotor maintains structural integrity and consistent braking performance under various driving conditions.

The nominal thickness of 1.260 inches (32 mm) provides a durable braking surface, while the discard thickness of 1.157 inches (29.4 mm) indicates the minimum safe thickness before replacement is necessary. The five mounting bolt holes and stud/lug hole quantity of five ensure secure installation on compatible Mercedes-Benz vehicles.

Raybestos R-Line Product Line

The R-Line by Raybestos is designed to meet the demands of professional technicians and vehicle owners seeking reliable replacement rotors. This product line focuses on delivering rotors with precise fitment and consistent performance, making it suitable for a range of applications including luxury SUVs and crossovers like the Mercedes-Benz GL and ML series. The R-Line rotors are engineered to meet or exceed OEM specifications, providing a balance of durability and braking efficiency.

Applications and Problem Solving

• Replacement for worn or warped rotors causing brake pulsation
• Addressing reduced braking efficiency due to rotor thickness below discard limits
• Eliminating noise and vibration from uneven rotor surfaces
• Improving heat dissipation to prevent brake fade on Mercedes-Benz GL320, ML350, and R500 models
• Ensuring proper fitment and alignment for safe braking performance

Installation Notes and Tips

• Verify rotor thickness before installation to ensure it meets minimum discard thickness
• Clean mounting surfaces and hub to prevent rotor runout
• Torque mounting bolts to manufacturer specifications for secure fitment
• Inspect brake pads and replace if worn to maintain optimal braking
• Perform a test drive to confirm proper brake operation after installation

Quality Assurance and Warranty

Raybestos R-Line rotors are manufactured to meet strict quality standards, ensuring durability and consistent braking performance. While specific warranty details may vary, Raybestos typically offers coverage against defects in materials and workmanship. Using part number 980427R guarantees compatibility and reliability for Mercedes-Benz GL320, GL450, ML350, and related models.