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Dorman M631064 Brake Master Cylinder
Dorman Brake Master Cylinder for Mazda 6
This Dorman brake master cylinder is built for specific Mazda 6 applications from 2014-2021. It is engineered to match the original unit’s design, function, and performance, with new aluminum construction and a removable reservoir for a direct-fit hydraulic brake repair.
Key Features
- Fits 2014-2021 Mazda 6
- Brake master cylinder with 18 mm bore diameter
- Aluminum master cylinder body for durable replacement performance
- Two outlet design with M12x1.0 rearward outlet thread
- Removable reservoir included
- Master cylinder cap included
- Sensor included
- Two mounting holes
- Part number M631064
Detailed Description
Dorman M631064 is a brake master cylinder for Mazda 6 models from 2014 through 2021. It is precision-engineered to replicate the original master cylinder’s fit, function, and braking performance, making it a practical replacement for a worn, leaking, or internally bypassing hydraulic unit. The aluminum housing, 18 mm bore, and two-outlet layout support proper brake system operation, while the included reservoir, cap, and sensor help simplify component transfer during service. This part cross-references GHY54340Z for the same application.
Common Repair Applications
- Brake pedal that sinks or feels inconsistent
- External brake fluid leakage at the master cylinder
- Internal bypass causing reduced hydraulic pressure
- Brake warning light concerns related to the master cylinder sensor
- Restoring braking response on a 2014-2021 Mazda 6
Installation Notes and Tips
Before installation, verify bore size, outlet thread size, and reservoir style against the original unit. Transfer any required vehicle-specific components not included with the part, and bleed the brake system thoroughly after installation to remove trapped air. Inspect brake lines, fittings, and the booster interface for wear or contamination before final assembly.
Quality Assurance
Dorman designs this master cylinder as a direct replacement for the original equipment unit on listed Mazda 6 applications. It is manufactured from new, high-quality materials to support safe, durable brake system service.
| Brand | Dorman |
|---|---|
| Part Number | M631064 |
| Mounting Hardware Included | No |
| Mounting Hole Quantity | 2 |
| Master Cylinder Bore Diameter | 18 |
| Brake Booster Included | No |
| Master Cylinder Cap Included | Yes |
| Master Cylinder Material | Aluminum |
| Push Rod Included | No |
| Reservoir Included | Yes |
| Secondary Outlet Thread Diameter | 12 |
| Bleeder Hoses Included | No |
| Sensor Included | Yes |
| Mounting Bracket Included | No |
| Number of Outlets | 2 |
| Package Contents | Master cylinder |
| Rearward Outlet Size | M12x1.0 |
| Reservoir Type | Removable |
| Thread Pitch | 1.0 |
This part fits 8 vehicles. Search below:
| Year | Make | Model | Transmission | Position | Notes |
|---|---|---|---|---|---|
| 2021 | Mazda | 6 | Automatic | N/A | |
| 2020 | Mazda | 6 | Automatic | N/A | |
| 2019 | Mazda | 6 | Automatic | N/A | |
| 2018 | Mazda | 6 | Automatic | N/A | |
| 2017 | Mazda | 6 | Automatic | N/A | |
| 2016 | Mazda | 6 | Automatic | N/A | |
| 2015 | Mazda | 6 | Automatic | N/A | |
| 2014 | Mazda | 6 | Automatic | N/A |
* 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.