BMW Brake Master Cylinders for BMW 3 Series E30 (1984-1991)

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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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ATE Master Cylinder Reservoir Grommet
ATE Master Cylinder Reservoir Grommet
ATE - Corporate Logo
T#:375679
Part#: 34311160133
In Stock
$ 4.99

This product was last offered at the strikethrough price on
07-14-2026

$ 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
ATE O-Ring - E10, E12, E21, E24, E28, E3, E30, E9
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.
Race German 24V Swap E30 Brake Booster Relocation Template
Race German 24V Swap E30 Brake Booster Relocation Template
Race German - Corporate Logo
T#:7703237
Part#: RGE30BBRT24V
Ships in 1 Business Day
$ 17.99 USD
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$ 17.99 USD
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Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. When you perform a 24V engine swap in your E30, you will need to move the brake booster over 1/2" so the intake manifold will not interfere with the the brake booster. Race German's 24v brake booster template takes all the guess work out for you. This template lines up with the existing brake booster holes, and gives you the exact position to drill the new holes. This little template can save you time and headaches.
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