Rein BMW Brake Master Cylinders for BMW 6 Series E64 (2004-2010)

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The brake master cylinder is responsible for distributing fluid from the reservoir to the front and rear brake systems. The fluid reservoir actually sits on top of the master cylinder with hard metal brake lines running out of it. There are a few places where the master cylinder can leak and cause a spongy or soft brake pedal. The inside has several pistons with o-rings and seals that can fail and allow brake fluid to escape. Likewise, the external metal lines also have o-rings where fluid can seep out or let air/moisture in.
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OEM Rein Brake Vacuum Pump w/ Seal - BMW E60 E63/64 E65/66 E53 E70
OEM Rein Brake Vacuum Pump w/ Seal - BMW E60 E63/64 E65/66 E53 E70 ...
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T#:45997531
Part#: 11667635657
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Sale - Save 5% $ 225.99

This product was last offered at the strikethrough price on
06-29-2026

$ 214.42 USD
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Sale - Save 5%
$ 225.99

This product was last offered at the strikethrough price on
06-29-2026

$ 214.42 USD
Free Shipping on orders $49 and up
Add to Wish List
If the brakes in your BMW have begun to feel a little soft or stopping doesn't seem like it used to, it may be your vacuum pump. The vacuum pump assists the power braking system in providing ample braking pressure.
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