BMW Brake Master Cylinders for BMW 7 Series E23 (1978-1987)

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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 Master Cylinder Clevis
Genuine BMW Master Cylinder Clevis
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:64474
Part#: 35211154097
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Genuine BMW Forkhead - L=44mm
This item fits the following BMW Chassis:
E30 M3,E30

ATE Brake Booster - E23, E24, E28
ATE Brake Booster - E23, E24, E28
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ATE - Corporate Logo
T#:587430
Part#: 34331156925
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$ 1,470.43 USD
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$ 1,470.43 USD
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Replacement Brake Booster
ATE Master Cylinder Reservoir Grommet
ATE Master Cylinder Reservoir Grommet
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T#:375679
Part#: 34311160133
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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.

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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

OE ATE Power Brake Booster - E23
OE ATE Power Brake Booster - E23
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
ATE - Corporate Logo
T#:19697
Part#: 34331152825
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$ 1,565.99 USD
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$ 1,565.99 USD
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As you depress the brake pedal, your pedal linkage causes a shaft to move forward in response to your foot, and as this shaft moves forward, it interacts with the brake booster and master cylinder. The brake booster contains a diaphragm that separates its interior into two parts, with both in a partial vacuum. As the brake pedal is depressed, it causes a valve inside the booster to open, which in turn allows air into one side of the booster. This difference in pressure on one side helps to push the piston inside the brake master cylinder forward in response to the brake pedal, which in turn slows and stops your vehicle. If your brakes are feeling soft then it may be a good idea to replace your brake booster
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