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Raybestos 9821R Disc Brake Rotor - Front
Overview of Raybestos R-Line 9821R Disc Brake Rotor
The Raybestos R-Line 9821R disc brake rotor is engineered for Porsche 911, 924, and 944 models, providing reliable braking performance. This vented rotor is designed to meet the specific requirements of these vehicles, ensuring consistent stopping power and durability.
- Compatible with Porsche 911, 924, and 944 models
- Vented disc brake rotor for improved heat dissipation
- Overall height: 1.390 inches (35.300 mm)
- Outside diameter: 11.120 inches (282.450 mm)
- Mounting bolt hole quantity: 5 with 126.000 mm bolt circle diameter
- Center hole diameter: 4.215 inches (107.050 mm)
- Nominal thickness: 0.800 inches (20.300 mm)
- Discard thickness: 0.752 inches (19.100 mm)
- Conventional rotor type with 5 stud/lug holes
Detailed Product Description
The Raybestos R-Line 9821R disc brake rotor is a vented rotor designed to optimize heat dissipation during braking, which helps reduce brake fade and maintain consistent performance. With an outside diameter of 11.120 inches and an overall height of 1.390 inches, this rotor fits precisely on Porsche 911, 924, and 944 models. The rotor features a nominal thickness of 0.800 inches and a discard thickness of 0.752 inches, ensuring it meets OEM specifications for safe operation and longevity. The 5 mounting bolt holes with a 126.000 mm bolt circle diameter and a center hole diameter of 4.215 inches provide secure and accurate fitment. This conventional, vented rotor design supports effective heat management and braking efficiency under various driving conditions.
About the Raybestos R-Line Product Line
The R-Line by Raybestos is a product line focused on delivering reliable, OEM-quality brake components tailored for specific vehicle applications. The 9821R rotor exemplifies this approach by combining precise fitment with vented rotor technology to meet the braking demands of Porsche 911, 924, and 944 models. This line is designed to provide consistent performance and durability without unnecessary features, making it suitable for professional repairs and maintenance.
Common Applications and Issues Addressed
- Replacement for worn or warped rotors causing brake pulsation
- Improves braking performance on Porsche 911, 924, and 944 vehicles
- Addresses rotor thickness below discard limits to maintain safety
- Reduces brake fade through vented rotor design
- Restores proper rotor dimensions for secure mounting and alignment
Installation Notes and Tips
- Verify rotor thickness before installation; replace if below 0.752 inches discard thickness
- Ensure mounting surfaces are clean and free of debris for proper fitment
- Torque mounting bolts to manufacturer specifications to avoid rotor warping
- Inspect brake pads and replace if worn to prevent uneven rotor wear
- Perform a bed-in procedure after installation to optimize braking performance
Quality Assurance and Warranty
Raybestos R-Line rotors are manufactured to meet or exceed OEM standards for fit, form, and function. Each rotor undergoes rigorous quality control to ensure consistent thickness, balance, and material integrity. While specific warranty details are not provided here, Raybestos typically offers limited warranties covering defects in materials and workmanship. Always consult product documentation or authorized sources for exact warranty terms.
| Brand | Raybestos |
|---|---|
| Part Number | 9821R |
| Position | R-Line, Front |
| Center Hole Diameter | 4.215 |
| Center Hole Diameter | 107.050 |
| Conventional Or Drum-In-Hat Type Rotor | Conventional |
| Discard Thickness | 0.752 |
| Discard Thickness | 19.100 |
| Mounting Bolt Hole Circle Diameter | 4.961 |
| Mounting Bolt Hole Circle Diameter | 126.000 |
| Mounting Bolt Hole Diameter | 4.961 |
| Mounting Bolt Hole Diameter | 126.000 |
| Mounting Bolt Hole Quantity | 5 |
| Nominal Thickness | 0.800 |
| Nominal Thickness | 20.300 |
| Outside Diameter | 11.120 |
| Outside Diameter | 282.450 |
| Overall Height | 1.390 |
| Overall Height | 35.300 |
| Solid Or Vented Type Rotor | Vented |
| Stud/Lug Hole Quantity | 5 |
This part fits 31 vehicles. Search below:
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 1988 | Porsche | 924 | Front | R-Line | |
| 1987 | Porsche | 924 | Front | R-Line | |
| 1986 | Porsche | 944 | Base | Front | R-Line |
| 1985 | Porsche | 944 | Front | R-Line | |
| 1984 | Porsche | 944 | Front | R-Line | |
| 1983 | Porsche | 911 | Front | with Turbo Look; R-Line | |
| 1983 | Porsche | 944 | Front | R-Line | |
| 1982 | Porsche | 911 | Front | with Turbo Look; R-Line | |
| 1982 | Porsche | 924 | Base | Front | Fits vehicles with 5-lug wheels.; R-Line |
| 1982 | Porsche | 924 | Turbo | Front | Fits vehicles with 5-lug wheels.; R-Line |
| 1981 | Porsche | 911 | Front | with Turbo Look; R-Line | |
| 1981 | Porsche | 924 | Base | Front | Fits vehicles with 5-lug wheels.; R-Line |
| 1981 | Porsche | 924 | Turbo | Front | Fits vehicles with 5-lug wheels.; R-Line |
| 1980 | Porsche | 911 | Front | with Turbo Look; R-Line | |
| 1980 | Porsche | 924 | Front | Fits vehicles with 5-lug wheels.; R-Line | |
| 1979 | Porsche | 911 | Front | with Turbo Look; R-Line | |
| 1979 | Porsche | 924 | Front | Fits vehicles with 5-lug wheels.; R-Line | |
| 1978 | Porsche | 911 | Front | with Turbo Look; R-Line | |
| 1978 | Porsche | 924 | Front | Fits vehicles with 5-lug wheels.; R-Line | |
| 1977 | Porsche | 911 | Front | R-Line | |
| 1977 | Porsche | 924 | Front | Fits vehicles with 5-lug wheels.; R-Line | |
| 1976 | Porsche | 911 | Front | R-Line | |
| 1975 | Porsche | 911 | Front | R-Line | |
| 1974 | Porsche | 911 | Front | R-Line | |
| 1973 | Porsche | 911 | Front | Vented Rotor; R-Line | |
| 1972 | Porsche | 911 | Front | Vented Rotor; R-Line | |
| 1971 | Porsche | 911 | Front | Vented Rotor; R-Line | |
| 1970 | Porsche | 911 | Front | Vented Rotor; R-Line | |
| 1969 | Porsche | 911 | Front | Vented Rotor; R-Line | |
| 1968 | Porsche | 911 | Front | Vented Rotor; R-Line | |
| 1967 | Porsche | 911 | Front | Vented Rotor; R-Line |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.