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BMW Brake Master Cylinders

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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E30 24V Swap Brake Fluid Reservoir Relocation Kit
10X Entries Into Our F80 M3 Sweepstakes
Turner Motorsport - Corporate Logo
T#:48642684
Part#: 059282LA01KT1
Ships in 5 Business Days
Sale - Save 2% $ 198.99

This product was last offered at the strikethrough price on
06-14-2026

$ 194.56 USD
Free Shipping
Sale - Save 2%
$ 198.99

This product was last offered at the strikethrough price on
06-14-2026

$ 194.56 USD
Free Shipping

When swapping an M5X engine into your E30, interference between the intake manifold and brake booster-mounted reservoir is a common problem. Tighter clearance necessitates the use of a different brake booster, which means the brake fluid reservoir will need to be retrofitted or relocated. This is particularly difficult when using the larger, dual-diaphragm brake booster from an E32 or E34.

To solve this issue, we've designed a clean, OE-style solution that requires zero fabrication. Our stainless steel bracket relocates the brake fluid reservoir to the original, left-hand strut tower location, once used for mounting the M20's power steering fluid reservoir. This provides the clearance necessary for fitting an M50/S50, M52/S52, M54, or S54 in the engine bay of your E30.

Designed with the DIY E30 24V swap community in mind, our design delivers factory-quality fit and finish with none of the guesswork.

FEATURES

Brushed stainless steel bracket for corrosion resistance and durability Yellow zinc-plated hardware to match the original Genuine BMW fasteners Compatible with the ATE remote reservoir found on E10 2002 models (part number 34321112399) KIT CONTENTS

Turner Motorsport Brake Fluid Reservoir Bracket & Installation Hardware ATE Remote Brake Fluid Reservoir Genuine BMW Connecting Pipe Remote Reservoir Hose PRODUCT DEVELOPMENT

Our 24V Swap Brake Fluid Reservoir Bracket was designed, engineered, tested, and quality inspected by our Research and Development team in our Wadsworth, Ohio, facility. We strive for the highest level of precision and quality through leading-edge product development technology, including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing.

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E30 24V Swap Brake Fluid Reservoir Relocation Bracket
10X Entries Into Our F80 M3 Sweepstakes
Turner Motorsport - Corporate Logo
T#:48642681
Part#: 059282LA01KT
In Stock
Sale - Save 26% $ 68.99

This product was last offered at the strikethrough price on
06-14-2026

$ 51.05 USD
Free Shipping
Sale - Save 26%
$ 68.99

This product was last offered at the strikethrough price on
06-14-2026

$ 51.05 USD
Free Shipping

When swapping an M5X engine into your E30, interference between the intake manifold and brake booster-mounted reservoir is a common problem. Tighter clearance necessitates the use of a different brake booster, which means the brake fluid reservoir will need to be retrofitted or relocated. This is particularly difficult when using the larger, dual-diaphragm brake booster from an E32 or E34.

To solve this issue, we've designed a clean, OE-style solution that requires zero fabrication. Our stainless steel bracket relocates the brake fluid reservoir to the original, left-hand strut tower location, once used for mounting the M20's power steering fluid reservoir. This provides the clearance necessary for fitting an M50/S50, M52/S52, M54, or S54 in the engine bay of your E30.

Designed with the DIY E30 24V swap community in mind, our design delivers factory-quality fit and finish with none of the guesswork.

Looking for a complete kit that includes the brake fluid reservoir, hose, and other mounting components? See T#48642684.

FEATURES

Brushed stainless steel bracket for corrosion resistance and durability Yellow zinc-plated hardware to match the original Genuine BMW fasteners Compatible with the ATE remote reservoir found on E10 2002 models (part number 34321112399) PRODUCT DEVELOPMENT

Our 24V Swap Brake Fluid Reservoir Bracket was designed, engineered, tested, and quality inspected by our Research and Development team in our Wadsworth, Ohio, facility. We strive for the highest level of precision and quality through leading-edge product development technology, including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing.

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Brake Master Cylinder Upgrade - E30 325e, 325i, M3
10X Entries Into Our F80 M3 Sweepstakes
Turner Motorsport - Corporate Logo
T#:14298
Part#: TMS14298
Ships in 1 day
$ 413.99

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

$ 348.99 USD
Free Shipping
$ 348.99 USD
Free Shipping
This is the 25mm master cylinder upgrade for E30 3 series. It features the larger master cylinder from the E32 750il (#34311156643) with the new required brake line (#34326755585). This set up is used on many track driven E30's to allow for extra stopping power.

This item fits the following BMWs:
1984-1991 E30 BMW 325e 325es 325i 325ic 325is M3
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ATE - Corporate Logo
T#:15922
Part#: 34311156643
Ships in 1 day
$ 433.94

This product was last offered at the strikethrough price on
06-26-2026

$ 324.83 USD
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$ 324.83 USD
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This is the OEM brake master cylinder for E32 750il made by ATE. This master cylinder can be used as an upgrade for E30 models (in conjunction with brake line #34326755585).

This item fits the following BMWs:
1987-3/1988 E32 BMW 735i 735il
1988-1994 E32 BMW 750il

Brake Master Cylinder Upgrade
1984-1991 E30 BMW 325e 325es 325i 325ic 325is M3
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ATE - Corporate Logo
T#:374237
Part#: 34336785666
Ships in 1 day
$ 313.44

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

$ 209.55 USD
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$ 209.55 USD
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Direct replacement master cylinder
TRW - Corporate Logo
T#:592494
Part#: 34336779742
In Stock
$ 327.99

This product was last offered at the strikethrough price on
07-01-2026

$ 244.65 USD
Free Shipping
$ 244.65 USD
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Make sure you car stops on a dime by replacing a faulty or leaky brake booster

TRW - Corporate Logo
T#:12758
Part#: 34311162915
Ships in 5 Business Days
$ 341.79 USD
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$ 341.79 USD
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BRAKE MASTER CYLINDER:343021
ATE - Corporate Logo
T#:8084
Part#: 34311155270
In Stock at Vendor
$ 423.81

This product was last offered at the strikethrough price on
08-26-2026

$ 375.35 USD
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$ 375.35 USD
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This is an OEM replacement brake master cylinder that fits many E28 5 series and E24 6 series. If your original BMW brake master cylinder has failed, this is the high quality replacement you need.

only for cars with ABS

This item fits the following BMWs:
1982-1988 E28 BMW 524td 528e 535i 535is M5
1983-1989 E24 BMW 633csi 635csi M6
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ATE - Corporate Logo
T#:20886
Part#: 34336779682
Ships in 1-2 days
$ 329.10

This product was last offered at the strikethrough price on
08-13-2026

$ 227.98 USD
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$ 227.98 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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TRW - Corporate Logo
T#:15925
Part#: 34312282343
Ships in 1 Business Day
$ 168.72 USD
Free Shipping
$ 168.72 USD
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This is an OEM replacement brake master cylinder for the E46 M3.

This item fits the following BMWs:
2001-2002 E46 BMW M3, M3 cpnvertible
TRW - Corporate Logo
T#:374811
Part#: 34336760461
Ships in 1 day
$ 414.93 USD
Free Shipping
$ 414.93 USD
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Restore proper braking performance
ATE - Corporate Logo
T#:594506
Part#: 34336779681
Ships in 1 Business Day
$ 345.18 USD
Free Shipping
$ 345.18 USD
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TRW - Corporate Logo
T#:593986
Part#: 34336786586
Ships in 2 Business Days
$ 271.99

This product was last offered at the strikethrough price on
04-20-2026

$ 246.99 USD
Free Shipping
$ 246.99 USD
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Replacement Brake Master Cylinder from TRW
TRW - Corporate Logo
T#:13585
Part#: 34331156978
Ships in 1 Business Day
$ 173.99

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

$ 169.62 USD
Free Shipping
$ 169.62 USD
Free Shipping
This is an OEM replacement brake master cylinder that fits many E32 and E34 models. If your original BMW brake master cylinder has failed, this is the high quality replacement you need. 3/1988-1992 E32 BMW 735i 735il
1989-1990 E34 BMW 525i
1989-1995 E34 BMW 535i M5
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TRW - Corporate Logo
T#:594031
Part#: 34326779736
Ships in 2 Business Days
$ 405.78 USD
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$ 405.78 USD
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Includes sealing o-ring and master cylinder to brake booster nuts.

ATE - Corporate Logo
T#:587430
Part#: 34331156925
Ships in 3 Business Days
$ 1,470.43 USD
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$ 1,470.43 USD
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Replacement Brake Booster

ATE - Corporate Logo
T#:1195882
Part#: 34336779721
Ships in 1 day
$ 402.99

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

$ 391.99 USD
Free Shipping
$ 391.99 USD
Free Shipping
Replace your failed brake booster to restore braking power
TRW - Corporate Logo
T#:13581
Part#: 34316757743
Ships in 3 Business Days
$ 262.90 USD
Free Shipping
$ 262.90 USD
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This is an OEM replacement brake master cylinder that fits many E53 X5 models. If your original BMW brake master cylinder has failed, this is the high quality replacement you need.

This item fits the following BMWs:
2002-2006 E53 BMW X5 3.0i X5 4.4i X5 4.6is X5 4.8is
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ATE - Corporate Logo
T#:5309611
Part#: 34336786585
Ships in 1 Business Day
$ 229.99 USD
Free Shipping
$ 229.99 USD
Free Shipping