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BMW Brake Master Cylinders for BMW E12 530i M30 3.0L

Clear BMW chassis

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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Grommet - Brake Master Cylinder To Reservoir (22 X 7.3 Mm)

T#:594654

Part#: 34311121911

In Stock at Vendor

$ 7.52

This product was last offered at the strikethrough price on
08-26-2026

$ 6.72 USD

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$ 6.72 USD

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ATE O-Ring - E10, E12, E21, E24, E28, E3, E30, E9

T#:1196093

Part#: 34314650345

Ships in 2 Business Days

$ 4.99 USD

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$ 4.99 USD

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Seals the brake master cylinder to the power brake booster.

Grommet - Brake Master Cylinder To Reservoir (17 X 6.5 Mm)

T#:640646

Part#: 34311103205

Ships in 1 Business Day

$ 9.99

This product was last offered at the strikethrough price on
08-26-2026

$ 8.99 USD

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$ 8.99 USD

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FTE Grommet - Brake Master Cylinder to Reservoir (22 X 7.3 mm) - E10 ...

T#:8081

Part#: 34311121911

Back Ordered

$ 3.99

This product was last offered at the strikethrough price on
05-07-2026

$ 2.99 USD

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$ 2.99 USD

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BRAKES PLUG 34311121911

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