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.
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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Technical Data Sheet: Rein Automotive OE Vacuum Control Valve Part Number: 11617521860 Engineering peak performance in European power units requires absolute fidelity to original equipment specifications. The Rein Automotive OE Quality Vacuum Valve is engineered to meet the rigorous demands of professional motorsport and high-performance maintenance environments.
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