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Dorman M39842 Brake Master Cylinder
Reliable Brake Master Cylinder for Geo Corolla and Toyota Prizm
The Dorman M39842 Brake Master Cylinder is engineered to restore proper brake hydraulics in your Geo Corolla or Toyota Prizm. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.
- Master cylinder bore diameter of 0.813 inches for accurate hydraulic control
- Constructed from durable aluminum material for corrosion resistance and longevity
- Includes reservoir for brake fluid, simplifying installation
- Equipped with a sensor to monitor brake system status
- Two outlets with rearward outlet size M10 x 1.0 and thread pitch of 1.0 for secure connections
- Compatible with Geo Corolla and Toyota Prizm models
- Part number M39842 ensures exact replacement fit
Product Details and Specifications
The Dorman M39842 Brake Master Cylinder features a precise 0.813-inch bore diameter, which is critical for maintaining proper hydraulic pressure in the brake system. Made from aluminum, this master cylinder offers resistance to rust and wear, contributing to a longer service life. The included reservoir allows for easy brake fluid management, while the integrated sensor provides real-time monitoring of brake system conditions. With two outlets and a rearward outlet thread size of M10 x 1.0, this part ensures compatibility with the brake lines on Geo Corolla and Toyota Prizm vehicles. The thread pitch of 1.0 guarantees a secure and leak-free connection during installation.
Common Applications and Problem Resolution
- Restores brake fluid pressure in vehicles experiencing spongy or unresponsive brakes
- Replaces master cylinders with leaks or internal seal failures
- Addresses brake warning light activation due to sensor issues
- Solves inconsistent brake pedal feel caused by worn master cylinders
- Prevents brake fluid contamination with a new, integrated reservoir
Installation Notes and Tips
Installation of the Dorman M39842 Brake Master Cylinder requires careful attention to brake line connections and sensor wiring. Ensure the brake fluid reservoir is properly filled and free of air bubbles after installation. Bleeding the brake system is necessary to remove trapped air and restore optimal brake performance. Note that mounting hardware is not included, so retain original fasteners or acquire appropriate replacements. Verify thread pitch and outlet sizes to match existing brake lines on Geo Corolla or Toyota Prizm models.
Quality Assurance and Warranty Information
Dorman manufactures the M39842 Brake Master Cylinder to meet or exceed OEM specifications for fit and function. The aluminum construction and integrated sensor contribute to reliable operation under normal driving conditions. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in materials and workmanship. Consult product documentation or the supplier for exact warranty terms.
| Brand | Dorman |
| Part Number | M39842 |
| Master Cylinder Bore Diameter | 0.813 |
| Master Cylinder Material | Aluminum |
| Mounting Hardware Included | No |
| Number of Outlets | 2 |
| Package Contents | Master Cylinder |
| Rearward Outlet Size | M10 X 1.0 |
| Reservoir Included | Yes |
| Secondary Outlet Thread Diameter | 10 |
| Sensor Included | Yes |
| Thread Pitch | 1.0 |
This part fits 14 vehicles. Search below:
| Year | Make | Model | Submodel | Drive Type | Position | Notes |
|---|---|---|---|---|---|---|
| 1997 | Toyota | Corolla | N/A | Built in U.S.A.; Bore: 13/16 In. | ||
| 1996 | Toyota | Corolla | N/A | Built in U.S.A.; Bore: 13/16 In. | ||
| 1992 | Geo | Prizm | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||
| 1992 | Toyota | Corolla | FWD | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |
| 1991 | Geo | Prizm | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||
| 1991 | Toyota | Corolla | Base | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |
| 1991 | Toyota | Corolla | DLX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |
| 1991 | Toyota | Corolla | LE | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |
| 1991 | Toyota | Corolla | SR5 | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |
| 1990 | Geo | Prizm | N/A | From VIN LZ090311, this Brake Master Cylinder has a bore size of 13/16 inches with 3 mounting holes. | ||
| 1990 | Toyota | Corolla | Base | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |
| 1990 | Toyota | Corolla | DLX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |
| 1990 | Toyota | Corolla | LE | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |
| 1990 | Toyota | Corolla | SR5 | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. |
* 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.