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

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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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Genuine BMW Brake Booster Vacuum Hose - E32 E10 E39 E24 E28 E3 E30 E12 E34 E21 320i
Genuine BMW Brake Booster Vacuum Hose - E32 E10 E39 E24 E28 E3 E30 E1...
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Genuine BMW - Corporate Logo
T#:368303
Part#: 34331115926
Ships in 1-2 days
2% off MSRP $ 41.99

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$ 40.99 USD
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2% off MSRP
$ 41.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 40.99 USD
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Brake Vacuum Non-Return Check Valve
Brake Vacuum Non-Return Check Valve
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ATE - Corporate Logo
T#:389374
Part#: 34331151533A
In Stock at Vendor
$ 63.99 USD
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$ 63.99 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
ATE Master Cylinder Reservoir Grommet
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ATE - Corporate Logo
T#:375679
Part#: 34311160133
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$ 4.99 USD
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$ 4.99 USD
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Secures the reservoir to the master cylinder
Gasket Ring
Gasket Ring
A10X13,5-Al
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Genuine BMW - Corporate Logo
T#:6483
Part#: 07119963073
In Stock
Sale - Save 50% $ 1.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 0.99 USD
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Sale - Save 50%
$ 1.99

This product was last offered at the strikethrough price on
05-14-2026

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Genuine BMW Gasket Ring
This item fits the following BMW Chassis:
E30 M3,E34 M5,E60 M5,E63 M6,E30,E34,E39,E46,E53 X5 X5,E63,E83 X3,E85 Z4

ATE O-Ring - E10, E12, E21, E24, E28, E3, E30, E9
ATE O-Ring - E10, E12, E21, E24, E28, E3, E30, E9
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
ATE - Corporate Logo
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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