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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 on Sep 23, 2026
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 1-2 days
$ 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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Cohline - Corporate Logo
T#:8095
Part#: 34331115926
In Stock
$ 24.34

This product was last offered at the strikethrough price on
07-15-2026

$ 22.90 USD
Free Shipping on orders $49 and up
$ 22.90 USD
Free Shipping on orders $49 and up
BMW BRAKES VACUUM HOSE 34331115926

ATE - Corporate Logo
T#:15922
Part#: 34311156643
Ships in 1-2 days
$ 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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URO Brake Master Cylinder Hose - BMW
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:18003807
Part#: 35006857512
In Stock
$ 24.99 USD
Free Shipping on orders $49 and up

URO Brake Master Cylinder Hose - BMW

The URO Brake Master Cylinder Hose - BMW is engineered for optimal fitment and performance in your BMW’s brake system. The brake master cylinder reservoir hose plays a crucial role in ensuring proper fluid flow, and URO Parts' precise manufacturing ensures a secure and reliable connection. This hose is designed to withstand the demanding conditions of your brake system, ensuring longevity and safety.

  • Manufactured to OE dimensions for precise fitment and secure sealing
  • High-quality hose material resistant to glycol-based brake fluid corrosion
  • Ensures long-term reliability and performance under high-pressure conditions
  • Perfect for restoring the integrity of your brake system when replacing worn-out hoses
  • Easy to install, providing a hassle-free replacement experience
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Brake Master Cylinder
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373215
Part#: 34311165544
Ships in 2 Business Days
$ 106.99

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

$ 88.99 USD
Free Shipping
$ 88.99 USD
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Make sure your pedal force is actually making it to the calipers, otherwise you won't be able to stop. Stop quicker, better, and more reliably with new braking components.
BMW E30 E36 Brake Master Cylinder
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373210
Part#: 34311157206
Ships in 2 Business Days
$ 177.99 USD
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$ 177.99 USD
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Direct replacement master cylinder

ATE - Corporate Logo
T#:374237
Part#: 34336785666
Ships in 1-2 days
$ 313.44

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

$ 209.55 USD
Free Shipping
$ 209.55 USD
Free Shipping
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
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$ 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
URO Brake Booster Vacuum Hose - 34336751108
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:28171570
Part#: 34336751108
In Stock
$ 50.99 USD
Free Shipping on orders $49 and up


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
Free Shipping
$ 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
Free Shipping
$ 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 2 Business Days
$ 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 1-2 days
$ 414.93 USD
Free Shipping
$ 414.93 USD
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Restore proper braking performance

ATE - Corporate Logo
T#:389374
Part#: 34331151533A
Ships in 1-2 days
$ 63.99

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

$ 25.15 USD
Free Shipping on orders $49 and up
$ 25.15 USD
Free Shipping on orders $49 and up
Check valve used in the large vaccuum hose between the throttle body and brake booster. OEM Ate part. Replaces OE BMW #34331151532.
Vacuum Pump
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:15445599
Part#: 11667622380
Ships in 2 Business Days
$ 205.99 USD
Free Shipping on orders $49 and up
$ 205.99 USD
Free Shipping on orders $49 and up
Replace a failing brake booster vacuum pump with this OE equivalent to ensure proper braking performance and avoid future issues to could happen.

ATE - Corporate Logo
T#:594506
Part#: 34336779681
Ships in 2 Business Days
$ 345.18 USD
Free Shipping
$ 345.18 USD
Free Shipping
TRW - Corporate Logo
T#:593986
Part#: 34336786586
Ships in 3 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

Brake Master Cylinder
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373206
Part#: 34311113656
Ships in 2 Business Days
$ 112.91 USD
Free Shipping
$ 112.91 USD
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Make sure your pedal force is actually making it to the calipers, otherwise you won't be able to stop. Stop quicker, better, and more reliably with new braking components.

Brake Master Cylinder
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373208
Part#: 34311156643
Ships in 2 Business Days
$ 139.99

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

$ 119.99 USD
Free Shipping
$ 119.99 USD
Free Shipping
Replace your worn-out master cylinder
TRW - Corporate Logo
T#:13585
Part#: 34331156978
Ships in 2 Business Days
$ 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 3 Business Days
$ 405.78 USD
Free Shipping
$ 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 4 Business Days
$ 1,470.43 USD
Free Shipping
$ 1,470.43 USD
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Replacement Brake Booster
ATE - Corporate Logo
T#:1195882
Part#: 34336779721
Ships in 1-2 days
$ 402.99

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

$ 391.99 USD
Free Shipping
$ 391.99 USD
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Replace your failed brake booster to restore braking power
TRW - Corporate Logo
T#:13581
Part#: 34316757743
Ships in 4 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#:16441603
Part#: 34331162963
In Stock
$ 258.99 USD
Free Shipping on orders $49 and up
Has your brake pedal become stiff and hard to depress, or goes right to the floor with no pressure or feel, most likely the brake booster unit has failed. Replace the brake booster right away to restore proper braking performance.
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Brake Master Cylinder
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373211
Part#: 34311161870
Back Ordered
$ 29.99 USD
Free Shipping on orders $49 and up
Make sure your pedal force is actually making it to the calipers, otherwise you won't be able to stop. Stop quicker, better, and more reliably with new braking components.
ATE - Corporate Logo
T#:16441600
Part#: 34331162965
Back Ordered
$ 331.99 USD
Free Shipping on orders $49 and up
$ 331.99 USD
Free Shipping on orders $49 and up
Has your brake pedal become stiff and hard to depress, or goes right to the floor with no pressure or feel, most likely the brake booster unit has failed. Replace the brake booster right away to restore proper braking performance.
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ATE - Corporate Logo
T#:8079
Part#: 34311113656
Back Ordered
$ 119.99

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

$ 97.39 USD
Free Shipping on orders $49 and up
$ 97.39 USD
Free Shipping on orders $49 and up
OEM BMW BRAKES BRAKE MASTER CYLINDER 34311113656.--

This item fits the following BMWs:
BMW 1600, 2002

--.
TRW - Corporate Logo
T#:23615512
Part#: 193321071931
Back Ordered
$ 330.99 USD
Free Shipping on orders $49 and up
The brake booster in a car is essential for improving the efficiency of the braking system by amplifying the force exerted on the brake pedal. As time passes, the brake booster may undergo wear and tear, resulting in problems like reduced braking power, a soft or spongy brake pedal sensation, and potential brake fluid leaks. These issues pose a threat to the overall safety and performance of the vehicle. Consequently, replacing a worn or malfunctioning brake booster is crucial to maintaining optimal braking performance and ensuring the safety of the vehicle.
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TRW - Corporate Logo
T#:23615517
Part#: 193321071832
Back Ordered
$ 327.99 USD
Free Shipping on orders $49 and up
The brake booster in a car is essential for improving the efficiency of the braking system by amplifying the force exerted on the brake pedal. As time passes, the brake booster may undergo wear and tear, resulting in problems like reduced braking power, a soft or spongy brake pedal sensation, and potential brake fluid leaks. These issues pose a threat to the overall safety and performance of the vehicle. Consequently, replacing a worn or malfunctioning brake booster is crucial to maintaining optimal braking performance and ensuring the safety of the vehicle.
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TRW - Corporate Logo
T#:25142295
Part#: 34336792956
Back Ordered
$ 296.99 USD
Free Shipping on orders $49 and up
The brake booster in a car is essential for improving the efficiency of the braking system by amplifying the force exerted on the brake pedal. As time passes, the brake booster may undergo wear and tear, resulting in problems like reduced braking power, a soft or spongy brake pedal sensation, and potential brake fluid leaks. These issues pose a threat to the overall safety and performance of the vehicle. Consequently, replacing a worn or malfunctioning brake booster is crucial to maintaining optimal braking performance and ensuring the safety of the vehicle.
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ATE - Corporate Logo
T#:594654
Part#: 34311121911
In Stock at Vendor
$ 7.52

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

$ 6.54 USD
Free Shipping on orders $49 and up
$ 6.54 USD
Free Shipping on orders $49 and up
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
Free Shipping on orders $49 and up
$ 3.99 USD
Free Shipping on orders $49 and up
Secures the reservoir to the master cylinder


TRW - Corporate Logo
T#:593987
Part#: 53706041381
Ships in 2 Business Days
$ 301.55 USD
Free Shipping on orders $49 and up
Replacement Brake Master Cylinder from TRW
ATE - Corporate Logo
T#:591036
Part#: 34116768018
Ships in 2 Business Days
$ 10.08

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

$ 8.77 USD
Free Shipping on orders $49 and up
$ 8.77 USD
Free Shipping on orders $49 and up
Bleed Valve Screw for Dynamic Rear Sway Bar
URO Booster Gasket
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:37757286
Part#: 34331158929
In Stock
$ 7.99 USD
Free Shipping on orders $49 and up
This rubber gasket seals the vacuum line to the brake servo unit.

ATE - Corporate Logo
T#:5309611
Part#: 34336786585
Ships in 2 Business Days
$ 229.99 USD
Free Shipping
$ 229.99 USD
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ATE - Corporate Logo
T#:1196093
Part#: 34314650345
Ships in 3 Business Days
$ 4.99 USD
Free Shipping on orders $49 and up
Seals the brake master cylinder to the power brake booster.
Vacuum Pump
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:49892379
Part#: 11667586424
Ships in 2 Business Days
$ 318.99 USD
Free Shipping on orders $49 and up

ATE - Corporate Logo
T#:640646
Part#: 34311103205
Ships in 2 Business Days
$ 9.99

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

$ 8.99 USD
Free Shipping on orders $49 and up
$ 8.99 USD
Free Shipping on orders $49 and up
ATE - Corporate Logo
T#:19697
Part#: 34331152825
Ships in 2 Business Days
$ 1,565.99 USD
Free Shipping on orders $49 and up
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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TRW - Corporate Logo
T#:23615518
Part#: 193321071863
Ships in 3 Business Days
$ 324.99 USD
Free Shipping on orders $49 and up
The brake booster in a car is essential for improving the efficiency of the braking system by amplifying the force exerted on the brake pedal. As time passes, the brake booster may undergo wear and tear, resulting in problems like reduced braking power, a soft or spongy brake pedal sensation, and potential brake fluid leaks. These issues pose a threat to the overall safety and performance of the vehicle. Consequently, replacing a worn or malfunctioning brake booster is crucial to maintaining optimal braking performance and ensuring the safety of the vehicle.
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TRW - Corporate Logo
T#:23615508
Part#: 193321071955
Ships in 3 Business Days
$ 517.99 USD
Free Shipping on orders $49 and up
The brake booster in a car is essential for improving the efficiency of the braking system by amplifying the force exerted on the brake pedal. As time passes, the brake booster may undergo wear and tear, resulting in problems like reduced braking power, a soft or spongy brake pedal sensation, and potential brake fluid leaks. These issues pose a threat to the overall safety and performance of the vehicle. Consequently, replacing a worn or malfunctioning brake booster is crucial to maintaining optimal braking performance and ensuring the safety of the vehicle.
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TRW - Corporate Logo
T#:23615510
Part#: 193321071917
Back Ordered
$ 205.99 USD
Free Shipping on orders $49 and up
The brake booster in a car is essential for improving the efficiency of the braking system by amplifying the force exerted on the brake pedal. As time passes, the brake booster may undergo wear and tear, resulting in problems like reduced braking power, a soft or spongy brake pedal sensation, and potential brake fluid leaks. These issues pose a threat to the overall safety and performance of the vehicle. Consequently, replacing a worn or malfunctioning brake booster is crucial to maintaining optimal braking performance and ensuring the safety of the vehicle.
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TRW - Corporate Logo
T#:25042538
Part#: 193321071962
Ships in 3 Business Days
$ 348.99 USD
Free Shipping on orders $49 and up
The brake booster in a car is essential for improving the efficiency of the braking system by amplifying the force exerted on the brake pedal. As time passes, the brake booster may undergo wear and tear, resulting in problems like reduced braking power, a soft or spongy brake pedal sensation, and potential brake fluid leaks. These issues pose a threat to the overall safety and performance of the vehicle. Consequently, replacing a worn or malfunctioning brake booster is crucial to maintaining optimal braking performance and ensuring the safety of the vehicle.
Show More Show Less