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Dorman M630918 Brake Master Cylinder
| Brand | Dorman M630918 |
|---|---|
| Mounting Hardware Included | No |
| Master Cylinder Bore Diameter | 1 |
| Master Cylinder Material | Cast iron |
| Reservoir Included | No |
| Sensor Included | No |
| Number of Outlets | 2 |
| Package Contents | Master cylinder |
| Rearward Outlet Size | M12x1.0 |
| Reservoir Type | Removable |
| Secondary Outlet Thread Diameter | M12x1.0 |
| Fits | BMW · 114 vehicles |
OE-style replacement. Precision-engineered to match original design, function, and performance.
Cast iron construction. Built from new materials for a durable brake master cylinder.
Removable reservoir. Two outlets and a compact, serviceable design.
Cross-references Raybestos Brakes MC391505, 11-4694 and 130.34122 for the same application. See all 5.
Brake Master Cylinder for BMW Applications
Dorman M630918 is a brake master cylinder built for specific BMW years, makes, and models. It uses new, high-quality materials and is precision-engineered to match the original unit’s design, function, and performance.
- Brake master cylinder for select BMW 125i, 328i, 330i, 340i, 430i, 440i, 530i, 540i, 750i, M2, M235i, and M240i applications
- 1-inch bore diameter for OE-style hydraulic operation
- Cast iron master cylinder body for durable construction
- Two outlets with M12x1.0 rearward outlet size and M12x1.0 secondary outlet thread diameter
- Removable reservoir type; reservoir and sensor not included
- Part number M630918 for direct reference and catalog lookup
Detailed Product Overview
This brake master cylinder is designed for BMW brake hydraulic systems that require a 1-inch bore and a two-outlet layout. Dorman M630918 is a direct replacement-style component for vehicles such as the BMW 328i, 330i, 430i, 530i, 540i, M2, and M240i, helping restore consistent brake pedal response and hydraulic pressure delivery. This part cross-references Raybestos Brakes MC391505 for the same application.
Built from cast iron and supplied as the master cylinder only, this unit is intended for vehicles using a removable reservoir design. The M630918 part number is also useful when verifying interchange references during brake system service.
What This Part Helps Address
- Soft or inconsistent brake pedal feel
- Internal master cylinder leakage
- Loss of hydraulic pressure in the brake system
- Brake fluid bypass inside the master cylinder
- Brake warning symptoms tied to master cylinder wear
Installation Notes and Tips
Confirm bore size, outlet thread size, and reservoir style before installation. This master cylinder does not include mounting hardware, reservoir, or sensor, so reuse or source the required related components as needed. After installation, bleed the brake system thoroughly to remove air and verify proper pedal firmness. Always match the vehicle’s brake hydraulic configuration to the listed fitment before service.
Quality Assurance
Dorman engineers this replacement master cylinder to match the original part’s design and performance on the listed BMW applications. New materials and OE-style construction support dependable brake system service for the covered vehicles.
- Fits 2017-2019 BMW 230i
- Fits 2017-2019 BMW 230i xDrive
- Fits 2017-2019 BMW 340i GT xDrive
- Fits 2018-2019 BMW 430i
- Fits 2018-2019 BMW 430i Gran Coupe
- Fits 2018-2019 BMW 430i xDrive
- Fits 2018-2019 BMW 430i xDrive Gran Coupe
- Fits 2018-2019 BMW 440i
- Fits 2018-2019 BMW 440i Gran Coupe
- Fits 2018-2019 BMW 440i xDrive
- Fits 2018-2019 BMW 440i xDrive Gran Coupe
- Fits 2019 BMW 520i
- Fits 2019 BMW 530e
- Fits 2019 BMW 530e xDrive
- Fits 2019 BMW 530i
- Fits 2019 BMW 530i xDrive
- Fits 2019 BMW 540i
- Fits 2019 BMW 540i xDrive
- Fits 2019 BMW 740e xDrive
- Fits 2019 BMW 750i
- Fits 2019 BMW 750i xDrive
- Fits 2019 BMW 750Li
- Fits 2019 BMW 750Li xDrive
- Fits 2017-2019 BMW M140i
- Fits 2016-2019 BMW M2
- Fits 2017-2019 BMW M240i
- Fits 2017-2019 BMW M240i xDrive
- Fits 2014-2018 BMW 328d
- Fits 2014-2018 BMW 328d xDrive
- Fits 2016-2018 BMW 330e
- Fits 2016-2018 BMW 330i
- Fits 2017-2018 BMW 330i GT xDrive
- Fits 2017-2018 BMW 330i xDrive
- Fits 2016-2018 BMW 340i
- Fits 2016-2018 BMW 340i xDrive
- Fits 2014-2016 BMW 328i
- Fits 2014-2016 BMW 328i GT xDrive
- Fits 2014-2016 BMW 328i xDrive
- Fits 2014-2016 BMW 335i GT xDrive
- Fits 2013-2016 BMW M135i
- Fits 2014-2016 BMW M235i
- Fits 2015-2016 BMW M235i xDrive
- Fits 2014-2015 BMW 335i
- Fits 2014-2015 BMW 335i xDrive
- Fits 2015 BMW 428i
- Fits 2015 BMW 428i Gran Coupe
- Fits 2015 BMW 428i xDrive
- Fits 2015 BMW 428i xDrive Gran Coupe
- Fits 2015 BMW 435i
- Fits 2015 BMW 435i Gran Coupe
- Fits 2015 BMW 435i xDrive
- Fits 2015 BMW 435i xDrive Gran Coupe
- Fits 2013-2015 BMW ActiveHybrid 3
- Fits 2013 BMW 125i
| Year | Make | Model | Notes |
|---|---|---|---|
| 2019 | BMW | 230i | — |
| 2019 | BMW | 230i xDrive | — |
| 2019 | BMW | 340i GT xDrive | — |
| 2019 | BMW | 430i | — |
| 2019 | BMW | 430i Gran Coupe | — |
| 2019 | BMW | 430i xDrive | — |
| 2019 | BMW | 430i xDrive Gran Coupe | — |
| 2019 | BMW | 440i | — |
| 2019 | BMW | 440i Gran Coupe | — |
| 2019 | BMW | 440i xDrive | — |
| 2019 | BMW | 440i xDrive Gran Coupe | — |
| 2019 | BMW | 520i | — |
| 2019 | BMW | 530e | — |
| 2019 | BMW | 530e xDrive | — |
| 2019 | BMW | 530i | — |
| 2019 | BMW | 530i xDrive | — |
| 2019 | BMW | 540i | — |
| 2019 | BMW | 540i xDrive | — |
| 2019 | BMW | 740e xDrive | — |
| 2019 | BMW | 750i | — |
| 2019 | BMW | 750i xDrive | — |
| 2019 | BMW | 750Li | — |
| 2019 | BMW | 750Li xDrive | — |
| 2019 | BMW | Alpina B7 | — |
| 2019 | BMW | M140i | — |
| 2019 | BMW | M2 | — |
| 2019 | BMW | M240i | — |
| 2019 | BMW | M240i xDrive | — |
| 2018 | BMW | 230i | — |
| 2018 | BMW | 230i xDrive | — |
| 2018 | BMW | 328d | — |
| 2018 | BMW | 328d xDrive | — |
| 2018 | BMW | 330e | — |
| 2018 | BMW | 330i | — |
| 2018 | BMW | 330i GT xDrive | — |
| 2018 | BMW | 330i xDrive | — |
| 2018 | BMW | 340i | — |
| 2018 | BMW | 340i GT xDrive | — |
| 2018 | BMW | 340i xDrive | — |
| 2018 | BMW | 430i | — |
| 2018 | BMW | 430i Gran Coupe | — |
| 2018 | BMW | 430i xDrive | — |
| 2018 | BMW | 430i xDrive Gran Coupe | — |
| 2018 | BMW | 440i | — |
| 2018 | BMW | 440i Gran Coupe | — |
| 2018 | BMW | 440i xDrive | — |
| 2018 | BMW | 440i xDrive Gran Coupe | — |
| 2018 | BMW | M140i | — |
| 2018 | BMW | M2 | — |
| 2018 | BMW | M240i | — |
| 2018 | BMW | M240i xDrive | — |
| 2017 | BMW | 230i | — |
| 2017 | BMW | 230i xDrive | — |
| 2017 | BMW | 328d | — |
| 2017 | BMW | 328d xDrive | — |
| 2017 | BMW | 330e | — |
| 2017 | BMW | 330i | — |
| 2017 | BMW | 330i GT xDrive | — |
| 2017 | BMW | 330i xDrive | — |
| 2017 | BMW | 340i | — |
| 2017 | BMW | 340i GT xDrive | — |
| 2017 | BMW | 340i xDrive | — |
| 2017 | BMW | M140i | — |
| 2017 | BMW | M2 | — |
| 2017 | BMW | M240i | — |
| 2017 | BMW | M240i xDrive | — |
| 2016 | BMW | 328d | — |
| 2016 | BMW | 328d xDrive | — |
| 2016 | BMW | 328i | — |
| 2016 | BMW | 328i GT xDrive | — |
| 2016 | BMW | 328i xDrive | — |
| 2016 | BMW | 330e | — |
| 2016 | BMW | 330i | — |
| 2016 | BMW | 335i GT xDrive | — |
| 2016 | BMW | 340i | — |
| 2016 | BMW | 340i xDrive | — |
| 2016 | BMW | M135i | — |
| 2016 | BMW | M2 | — |
| 2016 | BMW | M235i | — |
| 2016 | BMW | M235i xDrive | — |
| 2015 | BMW | 328d | — |
| 2015 | BMW | 328d xDrive | — |
| 2015 | BMW | 328i | — |
| 2015 | BMW | 328i GT xDrive | — |
| 2015 | BMW | 328i xDrive | — |
| 2015 | BMW | 335i | — |
| 2015 | BMW | 335i GT xDrive | — |
| 2015 | BMW | 335i xDrive | — |
| 2015 | BMW | 428i | — |
| 2015 | BMW | 428i Gran Coupe | — |
| 2015 | BMW | 428i xDrive | — |
| 2015 | BMW | 428i xDrive Gran Coupe | — |
| 2015 | BMW | 435i | — |
| 2015 | BMW | 435i Gran Coupe | — |
| 2015 | BMW | 435i xDrive | — |
| 2015 | BMW | 435i xDrive Gran Coupe | — |
| 2015 | BMW | ActiveHybrid 3 | — |
| 2015 | BMW | M135i | — |
| 2015 | BMW | M235i | — |
| 2015 | BMW | M235i xDrive | — |
| 2014 | BMW | 328d | — |
| 2014 | BMW | 328d xDrive | — |
| 2014 | BMW | 328i | — |
| 2014 | BMW | 328i GT xDrive | — |
| 2014 | BMW | 328i xDrive | — |
| 2014 | BMW | 335i | — |
| 2014 | BMW | 335i GT xDrive | — |
| 2014 | BMW | 335i xDrive | — |
| 2014 | BMW | ActiveHybrid 3 | — |
| 2014 | BMW | M135i | — |
| 2014 | BMW | M235i | — |
| 2013 | BMW | 125i | — |
| 2013 | BMW | ActiveHybrid 3 | — |
| 2013 | BMW | M135i | — |
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