Dynamic Friction 355-31025 brake master cylinder for the 2011-2015 BMW Alpina B7 and other vehicles turns pedal force into hydraulic pressure for the brakes. Each press of the pedal pushes brake fluid out through the lines to the wheel brakes.
A soft or sinking brake pedal, fluid leaking near the cylinder or a brake warning light can all mean a master cylinder is wearing out. Before you replace it, rule out leaking brake lines, leaking calipers and air in the system, which can feel the same at the pedal.
The 2011-2015 BMW Alpina B7, the 2011-2015 BMW Alpina B7 xDrive and the 2011-2015 BMW Alpina B7L are among the cars this master cylinder fits, along with many other BMW models. Owners of other BMWs can look up their own year and model in the "Vehicles it fits" section.
One brake master cylinder. The reservoir is not included.
Does the Dynamic Friction 355-31025 fit a 2011-2015 BMW Alpina B7L?
Yes. Dynamic Friction 355-31025 fits the 2011-2015 BMW Alpina B7L. For another BMW, look up your year and model in the "Vehicles it fits" section.
Does this brake master cylinder come with a reservoir?
No. The reservoir is not included; this listing is one master cylinder only.
What bore size is the 355-31025 master cylinder?
The Dynamic Friction 355-31025 has a bore size of 27/22 mm.
Can a soft brake pedal mean the master cylinder is going bad?
Yes, it can. A soft or sinking pedal, fluid leaking near the cylinder or a brake warning light are common signs, and a shop can test the system to confirm the cause.
Can I keep driving with a failing brake master cylinder?
No. Have it checked or replaced promptly, because a failing master cylinder can reduce your ability to stop.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
