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ATE BMW Brake Master Cylinders for BMW E21 320i M10 1.8L

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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Brake Vacuum Non-Return Check Valve

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:389374

Part#: 34331151533A

In Stock at Vendor

$ 52.99

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

$ 50.99 USD

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$ 50.99 USD

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Check valve used in the large vaccuum hose between the throttle body and brake booster. OEM Ate part. Replaces OE BMW #34331151532.

ATE Master Cylinder Reservoir Grommet

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T#:375679

Part#: 34311160133

In Stock

$ 4.99

This product was last offered at the strikethrough price on
05-28-2026

$ 3.99 USD

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$ 3.99 USD

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Secures the reservoir to the master cylinder

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

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:1196093

Part#: 34314650345

In Stock at Vendor

$ 4.99 USD

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$ 4.99 USD

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Seals the brake master cylinder to the power brake booster.

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