Dorman M630721 brake master cylinder for the 2014-2019 BMW 640i xDrive Gran Coupe and other vehicles turns pedal force into hydraulic pressure for the brakes. This Dorman brake master cylinder has two outlets and is made entirely of new materials.
- Part of the Dorman First Stop line
- Aluminum cylinder housing
- Rubber components made of EPDM compound that resists glycol-based brake fluid
- Made to meet SAE International standards
Quick facts
- Part: Dorman M630721 brake master cylinder
- Fits: 2014-2019 BMW 640i xDrive Gran Coupe and other vehicles
- Material: Aluminum
- Condition: New
A soft or sinking brake pedal, brake fluid around the cylinder or a brake warning light can mean the master cylinder is wearing out. Those signs alone do not prove the cylinder is at fault, since a leaking caliper or brake line can show the same thing.
Fits
This is a direct-fit replacement master cylinder for the 2013-2019 BMW 650i Gran Coupe and the 2013-2019 BMW 650i xDrive Gran Coupe, and the brake system on these cars uses one master cylinder. If your car is not one of those, look it up in the "Vehicles it fits" section on this page.
Specifications
Fit and size
- Quantity per vehicle: 1
- Bore diameter: 0.875 in and 1.063 in
- Number of outlets: 2
- Rearward outlet size: M12 X 1.0
- Secondary outlet thread diameter: M12 X 1.0
- Primary outlet thread pitch: 1 mm
Build and materials
- Material: Aluminum
- Rubber components: EPDM compound
- Standards: SAE International
- Condition: New
- Country of origin: Taiwan
In the box
One master cylinder. The reservoir, mounting hardware and sensor are not included, so plan on new mounting hardware rather than reusing the old.
Interchange: 100-1165 · 13-3467 · 11-3467 · 130.34024 · 130.34026 · 355-31023 · 355-31025
34316761079 · 34336781621 · 34336786586 · 34336796729 · NM55447 · MC391249 · F142343 · MC142343
This part cross-references / interchanges with the following part numbers:
100-1165, 34316761079, 34336781621, 34336786586, 34336796729, 13-3467, 11-3467, 130.34024, 130.34026, 355-31023, 355-31025, NM55447, MC391249, F142343, MC142343
Frequently Asked Questions
Does this Dorman master cylinder fit the 2013-2019 BMW 650i Gran Coupe?
Yes. Dorman M630721 fits the 2013-2019 BMW 650i Gran Coupe. It also fits other BMW and Rolls-Royce models; find yours in the "Vehicles it fits" section.
Does this master cylinder come with the reservoir?
No. The Dorman M630721 is the cylinder alone. The reservoir, mounting hardware and sensor are not included.
What thread size are the outlets on this master cylinder?
The rearward outlet and the secondary outlet are both M12 X 1.0, and the primary outlet thread pitch is 1 mm.
Will the rubber parts handle glycol-based brake fluid?
Yes. All the rubber components are made of EPDM compound, which resists glycol-based brake fluid.
Is 13-3467 a cross-reference for the Dorman M630721?
Yes. 13-3467 is one of the numbers this master cylinder replaces, along with 100-1165, 11-3467 and 355-31023.
