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OE Quality
60-Day Returns
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DormanPart #: M631064
Dorman M631064 Brake Master Cylinder
⚙️ 8 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$246.45Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship
Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Mazda, 6
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? Click here for all Brake Master Cylinder options
Dorman M631064 Brake Master Cylinder
| 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:
GHY54340Z
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.