How to check, remove, and install a power brake booster on Mercedes-Benz C230?

On some V6 engine models, a small vacuum pump may be added to the power brake booster system, serving as the vacuum source for the booster, which is mounted to a bracket behind the right headlamp housing with a large diameter vacuum hose routed to the brake booster. If the system appears defective, diagnosis by a dealer service department is required. To check operation, depress the brake pedal several times with the engine off to ensure no change in pedal reserve distance, then start the engine; if the pedal goes down slightly, operation is normal. For an airtightness check, start the engine and turn it off after one or two minutes, then depress the brake pedal slowly several times; if the pedal depresses less each time, the booster is airtight. While the engine is running, depress the brake pedal, stop the engine with the pedal depressed, and if there's no change in pedal reserve travel after holding for 30 seconds, the booster is airtight. The power brake booster is not serviceable and should be replaced if defective. To remove it, with the engine off, press the brake pedal several times to remove stored vacuum, move the driver's seat to the rearmost position, and disconnect the negative battery terminal. Remove the windshield wiper motor and linkage, the brake master cylinder, and pull the vacuum hose fitting from the brake booster while leaving the vacuum hose attached. Remove electrical connectors from any sensors and switches mounted to the power brake booster, noting that models equipped with ESP will have components that need to be transferred to the replacement booster. Release wire harnesses from the separator inside the engine compartment and from the fuse and relay box, ensuring the Powertrain Control Module (PCM) is pulled out of the box for harness slack without disconnecting it. Remove the lower instrument panel insulator for access, the brake light switch if equipped, and the plastic cover over the brake pedal. Carefully pry off the retaining clip from the brake pedal pin, pull the pin from the brake pedal and pushrod clevis, disconnect the booster pushrod, and remove the booster mounting nuts. Slide the booster straight out from the firewall until the studs clear the holes. Installation is essentially the reverse of removal, ensuring to replace the seal between the power booster and the firewall, avoid dropping anything into the replacement booster when transferring sensors and switches, tighten the booster mounting nuts to the specified torque, reinstall the retaining clip securing the booster pushrod to the brake pedal pin, and bleed the master cylinder and brake system before testing the operation of the brakes.

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106 Brake Boosters found

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Mercedes-Benz Brake Booster Part Number: 205-430-04-30
$364.80 MSRP: $510.00
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Product Specifications
- Other Name: TS Brake Booster; Booster Assembly
- Replaces: 205-430-04-30-28
Fits the following Mercedes-Benz Models:
- C300 | 2015-2021 | 4Matic, Base | 4 Cyl 2.0 L GAS
- C350e | 2016-2018 | Base | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- C400 | 2015 | 4Matic | 6 Cyl 3.0 L GAS
- C43 AMG | 2017-2021 | 4Matic | 6 Cyl 3.0 L GAS
- C450 AMG | 2016 | 4Matic | 6 Cyl 3.0 L GAS
- C63 AMG | 2016-2021 | Base | 8 Cyl 4.0 L GAS
- C63 AMG S | 2015-2021 | Base | 8 Cyl 4.0 L GAS
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Mercedes-Benz Brake Booster Part Number: 005-430-55-30-28
$608.40 MSRP: $845.00
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Product Specifications
- Other Name: Brake Booster Assembly; Booster Assembly
- Replaces: 005-430-28-30, 005-430-55-30
Fits the following Mercedes-Benz Models:
- C230 | 2002-2007 | Kompressor, Sport | 4 Cyl 1.8 L GAS, 4 Cyl 2.3 L GAS, 6 Cyl 2.5 L FLEX, 6 Cyl 2.5 L GAS
- C240 | 2001-2005 | 4Matic, Base | 6 Cyl 2.6 L GAS
- C280 | 2006-2007 | 4Matic, Luxury | 6 Cyl 3.0 L GAS
- C32 AMG | 2002-2004 | Base | 6 Cyl 3.2 L GAS
- C320 | 2001-2005 | 4Matic, Base | 6 Cyl 3.2 L FLEX, 6 Cyl 3.2 L GAS
- C350 | 2006-2007 | 4Matic, Luxury, Sport | 6 Cyl 3.5 L GAS
- C55 AMG | 2005-2006 | Base | 8 Cyl 5.5 L GAS
- CLK320 | 2003-2005 | Base | 6 Cyl 3.2 L GAS
- CLK350 | 2006-2009 | Base | 6 Cyl 3.5 L GAS
- CLK500 | 2003-2006 | Base | 8 Cyl 5.0 L GAS
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Mercedes-Benz Brake Booster Part Number: 253-431-40-00
$312.00 MSRP: $434.00
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Product Specifications
- Other Name: TS Brake Booster; Booster Assembly
- Replaces: 253-430-06-00
Fits the following Mercedes-Benz Models:
- E63 AMG S | 2021 | 4Matic+ | 8 Cyl 4.0 L GAS
- GLC43 AMG | 2018-2019 | 4Matic | 6 Cyl 3.0 L GAS
- GLC63 AMG | 2018-2019 | 4Matic | 8 Cyl 4.0 L GAS
- GLC63 AMG S | 2018-2019 | 4Matic | 8 Cyl 4.0 L GAS
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Mercedes-Benz Brake Booster Part Number: 212-430-31-30
$525.60 MSRP: $730.00
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Product Specifications
- Other Name: Booster Assembly
Fits the following Mercedes-Benz Models:
- CLS400 | 2015-2017 | 4Matic, Base | 6 Cyl 3.0 L GAS
- CLS550 | 2014-2018 | 4Matic, Base | 8 Cyl 4.7 L GAS
- CLS63 AMG | 2014 | 4Matic | 8 Cyl 5.5 L GAS
- CLS63 AMG S | 2014-2018 | 4Matic | 8 Cyl 5.5 L GAS
- E250 | 2014-2016 | Bluetec, Bluetec 4Matic | 4 Cyl 2.1 L DIESEL
- E350 | 2014-2016 | 4Matic, Base | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- E400 | 2015-2016 | 4Matic, Base | 6 Cyl 3.0 L GAS
- E550 | 2014 | 4Matic | 8 Cyl 4.7 L GAS
- E63 AMG | 2014-2015 | 4Matic | 8 Cyl 5.5 L GAS
- E63 AMG S | 2014-2016 | 4Matic | 8 Cyl 5.5 L GAS
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Mercedes-Benz Brake Booster Part Number: 246-430-09-30
$326.40 MSRP: $454.00
You Save: $127.60 (29%)
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Product Specifications
- Other Name: TS Servo Unit For Brake; Booster Assembly
Fits the following Mercedes-Benz Models:
- CLA250 | 2014-2019 | 4Matic, Base | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
- CLA45 AMG | 2014-2019 | 4Matic | 4 Cyl 2.0 L GAS
- GLA250 | 2015-2020 | 4Matic, Base | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
- GLA45 AMG | 2015-2019 | 4Matic | 4 Cyl 2.0 L GAS
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Mercedes-Benz Brake Booster Part Number: 177-430-79-00
$408.00 MSRP: $570.00
You Save: $162.00 (29%)
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Product Specifications
- Other Name: Booster Assembly
- Replaces: 177-430-51-00
Fits the following Mercedes-Benz Models:
- A220 | 2019-2022 | 4Matic, Base | 4 Cyl 2.0 L GAS
- A35 AMG | 2020-2021 | 4Matic | 4 Cyl 2.0 L GAS
- CLA250 | 2020-2025 | 4Matic, Base | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- CLA35 AMG | 2020-2025 | 4Matic | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- CLA45 AMG | 2020-2023 | 4Matic | 4 Cyl 2.0 L GAS
- CLA45 AMG S | 2024-2025 | 4Matic+ | 4 Cyl 2.0 L GAS
- GLA250 | 2021-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS
- GLA35 AMG | 2021-2023 | 4Matic | 4 Cyl 2.0 L GAS
- GLA45 AMG | 2021-2023 | 4Matic | 4 Cyl 2.0 L GAS
- GLB250 | 2020-2025 | 4Matic, Base | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Mercedes-Benz Brake Booster Part Number: 166-430-10-30
$754.80 MSRP: $1050.00
You Save: $295.20 (29%)
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Product Specifications
- Other Name: TS Brake Booster; Booster Assembly
- Replaces: 166-430-05-30
Fits the following Mercedes-Benz Models:
- GL350 | 2013-2016 | Bluetec 4Matic | 6 Cyl 3.0 L DIESEL
- GL450 | 2013-2016 | 4Matic, Base | 6 Cyl 3.0 L GAS, 8 Cyl 4.7 L GAS
- GL550 | 2013-2016 | 4Matic | 8 Cyl 4.7 L GAS
- GL63 AMG | 2013-2016 | Base | 8 Cyl 5.5 L GAS
- GLE300d | 2016-2017 | 4Matic | 4 Cyl 2.1 L DIESEL
- GLE350 | 2016-2018 | 4Matic, Base | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- GLE400 | 2019, 2016-2017 | 4Matic | 6 Cyl 3.0 L GAS
- GLE43 AMG | 2017-2019 | 4Matic | 6 Cyl 3.0 L GAS
- GLE450 AMG | 2016 | 4Matic | 6 Cyl 3.0 L GAS
- GLE550e | 2016-2017 | 4Matic | 6 Cyl 3.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Mercedes-Benz Brake Booster Part Number: 167-430-26-00
$408.00 MSRP: $570.00
You Save: $162.00 (29%)
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Product Specifications
- Other Name: Booster Assembly
Fits the following Mercedes-Benz Models:
- GLE350 | 2020-2025 | 4Matic, Base | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- GLE450 | 2020-2025 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- GLE450 SUV | 2022-2025 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- GLE450e | 2024-2025 | 4Matic | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- GLE580 | 2020-2025 | 4Matic | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
- GLS450 | 2020-2025 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- GLS580 | 2020-2025 | 4Matic | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
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Mercedes-Benz Brake Booster Part Number: 213-430-10-30
$528.00 MSRP: $735.00
You Save: $207.00 (29%)
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Product Specifications
- Other Name: TS Brake Booster; Booster Assembly
Fits the following Mercedes-Benz Models:
- CLS450 | 2019-2023 | 4Matic, Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- CLS53 AMG | 2019-2021 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- E300 | 2017-2019 | 4Matic, Base | 4 Cyl 2.0 L GAS
- E350 | 2020-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS
- E400 | 2017-2018 | 4Matic, Base | 6 Cyl 3.0 L GAS
- E43 AMG | 2017-2018 | 4Matic | 6 Cyl 3.0 L GAS
- E450 | 2019-2023 | 4Matic, Base | 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- E53 AMG | 2019-2023 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- GLC300 | 2019-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- GLC350e | 2019-2020 | 4Matic | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Mercedes-Benz SERVO UNIT FOR BRAKE Part Number: 000-431-21-27
$323.35 MSRP: $450.00
You Save: $126.65 (29%)
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Product Specifications
- Other Name: Booster, Booster Assembly, Brake Booster
Fits the following Mercedes-Benz Models:
- Sprinter 2500 | 2010-2015 | Base | 4 Cyl 2.1 L DIESEL, 6 Cyl 3.0 L DIESEL
- Sprinter 3500 | 2010-2015 | Base | 4 Cyl 2.1 L DIESEL, 6 Cyl 3.0 L DIESEL
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Mercedes-Benz BRAKE BOOSTER Part Number: 906-431-00-27
$253.79 MSRP: $354.00
You Save: $100.21 (29%)
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Product Specifications
- Other Name: Booster Assembly
Fits the following Mercedes-Benz Models:
- Sprinter 2500 | 2014-2018 | Base | 4 Cyl 2.1 L DIESEL, 6 Cyl 3.0 L DIESEL
- Sprinter 3500 | 2014-2018 | Base | 4 Cyl 2.1 L DIESEL, 6 Cyl 3.0 L DIESEL
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Mercedes-Benz BRAKE BOOSTER Part Number: 447-431-02-00
$325.20 MSRP: $452.00
You Save: $126.80 (29%)
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Product Specifications
- Other Name: Booster Assembly
- Replaces: 447-431-02-27
Fits the following Mercedes-Benz Models:
- Metris | 2016-2020 | Base | 4 Cyl 2.0 L GAS
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Mercedes-Benz Booster Assembly Part Number: 206-430-32-00
$525.60 MSRP: $730.00
You Save: $204.40 (28%)
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Product Specifications
- Other Name: Brake Booster
Fits the following Mercedes-Benz Models:
- C300 | 2023-2025 | 4Matic, Base | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- C43 AMG | 2023-2025 | 4Matic | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.0 L GAS
- CLE300 | 2024-2025 | 4Matic | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- CLE450 | 2024-2025 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- CLE53 AMG | 2024-2025 | 4Matic+ | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
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Mercedes-Benz Brake Booster Part Number: 463-430-01-08
$235.20 MSRP: $328.00
You Save: $92.80 (29%)
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Product Specifications
- Other Name: Power Booster
Fits the following Mercedes-Benz Models:
- G550 | 2013-2018 | Base | 8 Cyl 4.0 L GAS, 8 Cyl 5.5 L GAS
- G63 AMG | 2013-2018 | Base | 8 Cyl 5.5 L GAS
- G65 AMG | 2016-2018 | Base | 12 Cyl 6.0 L GAS
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Mercedes-Benz Brake Booster Part Number: 251-430-00-00
$220.80 MSRP: $308.00
You Save: $87.20 (29%)
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Product Specifications
- Other Name: Brake Unit; Booster Assembly
- Replaces: 164-431-04-27, 164-431-06-27, 164-431-00-27, 164-431-05-27
Fits the following Mercedes-Benz Models:
- GL320 | 2007-2009 | Bluetec 4Matic, CDI | 6 Cyl 3.0 L DIESEL
- GL350 | 2010-2012 | Bluetec 4Matic | 6 Cyl 3.0 L DIESEL
- GL450 | 2007-2012 | Base | 8 Cyl 4.7 L GAS
- GL550 | 2008-2012 | Base | 8 Cyl 5.5 L GAS
- ML320 | 2007-2009 | Bluetec 4Matic, CDI | 6 Cyl 3.0 L DIESEL
- ML350 | 2006-2011 | 4Matic, Base, Bluetec 4Matic | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.5 L GAS
- ML450 | 2010-2011 | Hybrid 4Matic | 6 Cyl 3.5 L FULL HYBRID EV-GAS (FHEV)
- ML500 | 2006-2007 | Base | 8 Cyl 5.0 L GAS
- ML550 | 2008-2011 | Base | 8 Cyl 5.5 L GAS
- ML63 AMG | 2007-2011 | Base | 8 Cyl 6.3 L GAS
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Mercedes-Benz Brake Booster Part Number: 005-430-30-30
$529.20 MSRP: $735.00
You Save: $205.80 (28%)
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Product Specifications
- Other Name: Brake Booster Assembly; Booster Assembly
Fits the following Mercedes-Benz Models:
- SLK230 | 2001-2004 | Kompressor | 4 Cyl 2.3 L GAS
- SLK32 AMG | 2002-2004 | Base | 6 Cyl 3.2 L GAS
- SLK320 | 2001-2004 | Base | 6 Cyl 3.2 L GAS
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Mercedes-Benz Brake Booster Part Number: 190-431-03-00
$471.60 MSRP: $655.00
You Save: $183.40 (28%)
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Product Specifications
- Other Name: TS Brake Booster; Booster Assembly
Fits the following Mercedes-Benz Models:
- AMG GT | 2017-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT Black Series | 2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT C | 2018-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT R | 2018-2020 | Base | 8 Cyl 4.0 L GAS
- AMG GT R Pro | 2020 | Base | 8 Cyl 4.0 L GAS
- AMG GT S | 2016-2019 | Base | 8 Cyl 4.0 L GAS
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Mercedes-Benz Brake Booster Part Number: 221-430-25-30
$780.00 MSRP: $1090.00
You Save: $310.00 (29%)
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Product Specifications
- Other Name: Brake Booster Assembly; Booster Assembly
- Replaces: 221-430-08-30, 221-430-12-30, 221-430-22-30, 005-430-74-30
Fits the following Mercedes-Benz Models:
- CL550 | 2007-2010 | 4Matic, Base | 8 Cyl 5.5 L GAS
- CL600 | 2007-2010 | Base | 12 Cyl 5.5 L GAS
- CL63 AMG | 2008-2010 | Base | 8 Cyl 6.3 L GAS
- CL65 AMG | 2008-2010 | Base | 12 Cyl 6.0 L GAS
- S550 | 2007-2010 | 4Matic, Base | 8 Cyl 5.5 L GAS
- S600 | 2007-2013 | Base | 12 Cyl 5.5 L GAS
- S63 AMG | 2008-2010 | Base | 8 Cyl 6.3 L GAS
- S65 AMG | 2007-2013 | Base | 12 Cyl 6.0 L GAS
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Mercedes-Benz Brake Booster Part Number: 005-430-43-30
Product Specifications
- Other Name: Brake Booster Assembly; Booster Assembly
- Replaces: 005-430-43-30-27, 004-430-88-30, 004-430-88-30-05
Fits the following Mercedes-Benz Models:
- E300 | 1996-1999 | Base | 6 Cyl 3.0 L DIESEL
- E320 | 1996-2003 | 4Matic, Base | 6 Cyl 3.2 L GAS
- E420 | 1997 | Base | 8 Cyl 4.2 L GAS
- E430 | 1998-2002 | 4Matic, Base | 8 Cyl 4.3 L GAS
- E55 AMG | 1999-2002 | Base | 8 Cyl 5.5 L GAS
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Mercedes-Benz Brake Booster Part Number: 001-430-07-08
Product Specifications
- Other Name: Power Booster
- Replaces: 000-431-02-29, 000-431-00-29
Fits the following Mercedes-Benz Models:
- ML320 | 1998-2003 | Base | 6 Cyl 3.2 L GAS
- ML350 | 2003-2005 | Base | 6 Cyl 3.7 L GAS
- ML430 | 1999-2001 | Base | 8 Cyl 4.3 L GAS
- ML500 | 2002-2005 | Base | 8 Cyl 5.0 L GAS
- ML55 AMG | 2000-2003 | Base | 8 Cyl 5.5 L GAS
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Mercedes-Benz Brake Booster

The Mercedes-Benz Brake Booster increases pedal pressure so that drivers have strong and responsive stopping power with light effort, which gives confidence during city traffic and on long descents on the highway. Mercedes-Benz has carved its name from a tradition of combining luxury and future-oriented technology that dates back to 1926 and now reaches smart infotainment such as MBUX and the versatile MB.OS platform that connects battery management, driver assistance, and voice-guided navigation. The brand's commitment to digital innovation is combined with sleek styling and energy-saving powertrains so owners can enjoy performance, safety, and sustainability in one refined package. Because each vehicle in this lineup is required to meet high expectations for comfort and control, the Brake Booster gives an idea of the way this vacuum or hydraulic assist can function reliably throughout the gasoline, diesel, hybrid, and electric models. A sealed diaphragm, power piston, and precise valves generate a pressure difference, which forces more fluid to the calipers and backups such as stored vacuum or pump-driven pressure for reserve assist in case the engine stalls or intake vacuum drops. This universal design ensures that pedal feel remains the same no matter the size, weight, or drivetrain of the vehicle, supporting both easy daily commutes and spirited weekend drives. Combined with advanced chassis tuning and electronic stability systems, the Mercedes-Benz Brake Booster ensures that the legendary ride quality for which the brand is famous is matched by equally impressive stopping power.

Genuine parts are built to last. These components go through tough factory testing, so you can trust they will hold up over time. At MBPartsGiant.com, finding Mercedes-Benz Brake Booster is quick and simple. We keep a massive inventory in stock with low prices that are hard to beat. Just order online to get a real manufacturer's warranty with every single part. Returns won't be a headache either, thanks to our no-hassle policy. If you are in a rush, we provide expedited shipping to get your vehicle back on the road. Don't wait. Finish your repairs today and keep your Mercedes-Benz running like new. Explore the catalog now.

Mercedes-Benz Brake Booster Parts and Q&A

Brake Booster
005-430-55-30-28
Q: How to check, remove, and install a power brake booster on Mercedes-Benz C230?
A:
On some V6 engine models, a small vacuum pump may be added to the power brake booster system, serving as the vacuum source for the booster, which is mounted to a bracket behind the right headlamp housing with a large diameter vacuum hose routed to the brake booster. If the system appears defective, diagnosis by a dealer service department is required. To check operation, depress the brake pedal several times with the engine off to ensure no change in pedal reserve distance, then start the engine; if the pedal goes down slightly, operation is normal. For an airtightness check, start the engine and turn it off after one or two minutes, then depress the brake pedal slowly several times; if the pedal depresses less each time, the booster is airtight. While the engine is running, depress the brake pedal, stop the engine with the pedal depressed, and if there's no change in pedal reserve travel after holding for 30 seconds, the booster is airtight. The power brake booster is not serviceable and should be replaced if defective. To remove it, with the engine off, press the brake pedal several times to remove stored vacuum, move the driver's seat to the rearmost position, and disconnect the negative battery terminal. Remove the windshield wiper motor and linkage, the brake master cylinder, and pull the vacuum hose fitting from the brake booster while leaving the vacuum hose attached. Remove electrical connectors from any sensors and switches mounted to the power brake booster, noting that models equipped with ESP will have components that need to be transferred to the replacement booster. Release wire harnesses from the separator inside the engine compartment and from the fuse and relay box, ensuring the Powertrain Control Module (PCM) is pulled out of the box for harness slack without disconnecting it. Remove the lower instrument panel insulator for access, the brake light switch if equipped, and the plastic cover over the brake pedal. Carefully pry off the retaining clip from the brake pedal pin, pull the pin from the brake pedal and pushrod clevis, disconnect the booster pushrod, and remove the booster mounting nuts. Slide the booster straight out from the firewall until the studs clear the holes. Installation is essentially the reverse of removal, ensuring to replace the seal between the power booster and the firewall, avoid dropping anything into the replacement booster when transferring sensors and switches, tighten the booster mounting nuts to the specified torque, reinstall the retaining clip securing the booster pushrod to the brake pedal pin, and bleed the master cylinder and brake system before testing the operation of the brakes.