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ATE BMW Brake Master Cylinders for BMW 3 Series E46 (1999-2005)

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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ATE Brake Master Cylinder - E46, Z4

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

T#:374237

Part#: 34336785666

In Stock at Vendor

$ 313.44

This product was last offered at the strikethrough price on
06-18-2026

$ 312.12 USD

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$ 312.12 USD

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Direct replacement master cylinder

Brake Booster Servo Unit - E46 323i, 325i 328i, 330i

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

T#:20886

Part#: 34336779682

In Stock at Vendor

$ 284.99

This product was last offered at the strikethrough price on
04-23-2026

$ 284.08 USD

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$ 284.08 USD

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This ATE Brand brake booster is a direct replacement for the factory BMW vacuum assited brake booster servo unit on E46 3 series models.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi

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