BMW E53 Brake Master Cylinders

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.

For accurate results, specify your model below:

Brake Master Cylinder - E38 E39 X5 with DSC
TRW
T#: 13579
Mfg#: 34311165544
Ships in 3 days
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Brake Master Cylinder - E53 X5 3.0i 4.4i 4.6is 4.8is
TRW
T#: 13581
Mfg#: 34316757743
Ships in 3 days
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