OE Quality
60-Day Returns

Dorman M39443 Brake Master Cylinder
Reliable Brake Master Cylinder for Ford Tempo and Mercury Topaz
The Dorman M39443 Brake Master Cylinder is engineered to restore proper brake hydraulics in your Ford Tempo or Mercury Topaz. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.
- Constructed from durable aluminum for long-lasting strength
- Includes reservoir and sensor for complete brake system integration
- Features a 19.75 mm & 1-1/8 inch bore diameter for accurate fluid displacement
- Equipped with four outlets to support complex brake line configurations
- Rearward outlet sizes: M10 x 1.0 and M16 x 1.5 for secure connections
- Secondary outlet thread diameters: M12 x 1.0 and M16 x 1.5
Detailed Product Description
The Dorman M39443 Brake Master Cylinder is specifically designed for use in Ford Tempo and Mercury Topaz vehicles, providing a precise fit and reliable operation. Its aluminum construction offers corrosion resistance and durability under demanding conditions. The included reservoir and sensor facilitate seamless integration with your vehicle’s brake system, ensuring accurate fluid level monitoring and pressure control. With a bore diameter of 19.75 mm & 1-1/8 inch, this master cylinder delivers consistent hydraulic pressure to all four outlets, supporting both front and rear brake circuits. The rearward and secondary outlet thread sizes are engineered to match factory specifications, allowing for straightforward installation without modifications.
Common Applications and Problem Resolution
- Restores brake fluid pressure in Ford Tempo and Mercury Topaz brake systems
- Replaces worn or leaking master cylinders causing brake pedal sponginess
- Addresses brake fluid leaks from damaged or corroded master cylinders
- Resolves brake warning light issues related to faulty sensors
- Improves overall brake responsiveness and safety
Installation Notes and Tips
Installation of the Dorman M39443 Brake Master Cylinder requires careful attention to brake line connections and proper bleeding of the brake system to remove air. Ensure compatibility with your specific Ford Tempo or Mercury Topaz model year before installation. Since mounting hardware is not included, retain original fasteners or source appropriate replacements. Verify sensor connections are secure to maintain accurate brake fluid level monitoring.
Quality Assurance and Warranty
Dorman manufactures the M39443 Brake Master Cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable performance over time. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.
| Brand | Dorman |
| Part Number | M39443 |
| Mounting Hardware Included | No |
| Master Cylinder Material | Aluminum |
| Reservoir Included | Yes |
| Sensor Included | Yes |
| Master Cylinder Bore Diameter | 19.75 mm & 1-1/8 in |
| Number of Outlets | 4 |
| Package Contents | Master cylinder |
| Rearward Outlet Size | M10 x 1.0; m16 x 1.5 |
| Secondary Outlet Thread Diameter | M12 x 1.0; m16 x 1.5 |
This part fits 22 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1994 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1994 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
| 1993 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1993 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
| 1992 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1992 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
| 1991 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1991 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
| 1990 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1990 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
| 1989 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1989 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
| 1988 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1988 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
| 1987 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1987 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
| 1986 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1986 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
| 1985 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1985 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
| 1984 | Ford | Tempo | N/A | Bore: 19.75 mm |
| 1984 | Mercury | Topaz | N/A | Bore: 19.75 mm and 28.58 mm |
* 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.