How to remove, overhaul, and refit of the Brake Master Cylinder on Mercedes-Benz 190E?

You should know the hazards of hydraulic fluid before working on them. The first step should be to remove the battery negative terminal and the wiring connector on the level informer of brake fluid from the unit. Take out the master cylinder reservoir cap and siphon hydraulic fluid out of the reservoir, or open a bleed screw and press the brake pedal to pump the fluid out. When needed, remove the fluid hoses on the reservoir and seal off the ends in order to reduce leakage of fluids. Take your time when loading out the fluid reservoir of the master cylinder, do not touch the seals and seal the ports of the cylinder to avoid dirt infiltration. Clean up around the brake pipe unions, lay absorbent rags below them, record their correct locations, remove a union nut and take out the pipes, covering or taping the ends with rags to as much effect as possible not to lose the liquids or bring them inside. spindle and....... lifted away and then the two nuts and washers attaching the master cylinder to the vacuum servo unit, raising the unit up, take care not to tip over. Prior to assembling the master cylinder parts, verify the supply of spare parts as there are two types installed. Wipe the body of the master cylinder and the mounting seals on the fluid reservoir and record their proper locations. Hold the master cylinder body using a vice, and just press the piston in the cylinder to retract the secondary piston retaining pin. Download the piston with CIRclip, washer, and sealing ring, then take out the primary piston assembly and spring, and next the second piston and the spring, be notice of orientation. Wipe every part with appropriate cleaning pans even without using liquid based solvents and wipe them instantly. Inspect all parts of the design to determine if they are in good condition or worn or damaged, especially the cylinder bores, the pistons, etc., renewing those parts not in good condition. Just in case of the assembly is still usable, then get a repairing kit and re-do all the disrupted seals. Pre-pretreat the piston assemblies and new seals with clean hydraulic fluid and slide clean fluid into the cylinder bore during reassembly. Bend the spring to the secondary piston assembly and insert it by the master cylinder body with care not to entrap the piston seals. Place the secondary piston slot in place, slide it in place and then attach it with the retaining pin. Install the new primary piston assembly, and, where needed, install a new sealing ring at the end of the master cylinder and reinstall the washer and circlip, putting the circlip in the proper position. Insert the seals of the new fluid reservoir into the ports of the master cylinder. clean the mating-faces of the master cylinder and servo unit, replace old sealing ring on rear of master cylinder body and connect the master cylinder to servo unit, fitting them so they meet. Inspect (by refitting and tightening) the master cylinder retaining nuts, clean brake pipe unions and refit them to the master cylinder ports, and handfasten as directed. Then place the fluid reservoir in place and reconnect the fluid hoses as needed. Fill the master cylinder tank with new fluid and bleed the hydraulic system thoroughly, as the braking system has been tried and hence the car is ready to enter service again.

How to the remove and install of the Brake Master Cylinder on Mercedes-Benz C230?

The master cylinder can be removed by disconnecting the cable under the negative battery terminal and depressing heavily the brake pedal a few times to wash out vacuum in the power brake booster. Mark the cover on the ground and then twist the fittings on the master cylinder counterclockwise by a quarter and then place some rags under the master cylinder and wipe the area around the hydraulic line fittings with brake system cleaner without touching any of the paint. Withdraw as much of the fluid as you can out of the reservoir with a syringe and un-plug electrical connector of a brake fluid level warning switch. On models with manual transmission, disconnect the brake fluid line that leads to the clutch master cylinder reservoir, stuff rags into the fittings and prepare the line ends with caps or plastic bags. To avoid flattening corners in the brake lines to the master cylinder, replace the fittings at the ends with ones loosened with a flare-nut wrench. Be sure to pull brake lines carefully away of the master-cylinder and plug the ends to prevent contamination. Unscrew the electrical connector on the side of the master cylinder that fits into the socket of the electronic stability program brake pressure device; and, installing a second sensor in the front, also, unscrew another connector attached to the master cylinder upon its loosening. You can take off the sensor on the side prepared to leak brake fluid and remove the spring nut at the end of the master cylinder and then push down the front bracket and pull them up off the frame. Unscrew the master cylinder mounting nuts and move the master cylinder off the studs, working carefully not to tip or drop the component against the pushrod in the power brake booster or risk their destruction. When the master cylinder has taken off, un-connect the electrical connector on the bottom-front ESP brake pressure sensor (where appropriate). To install, place the brake pressure sensor(s) on the new master cylinder, and bleed it by placing it in a vise and connecting bleeder tubes to the outlet ports and by pushing the piston into place with a blunt tool as you fill the reservoir with the suggested brake fluid. Make sure to push the pistons gradually into the master cylinder and expel all the air until no more bubbles exist, and then unscrew the bleed tubes and replace them with plugs in the empty holes. Install a new vacuum seal on the master cylinder, lay a cover over reservoir, attach electrical connectors and place the master cylinder on the studs on the power brake booster screwing on nuts using finger tightening. Install the brake line fittings into the master cylinder being careful not to cross-thread the fittings, and screw the mounting nuts to the correct level of tight. Fit a new spring-nut and re-attach the front bracket, so that it is rotated inward about 5 mm beyond the terminus of the master cylinder. Fill the reservoir with the appropriate fluid, bleed the brake system; do not open the line fittings immediately, but have an assistant pump the brake pedal, loosen the line fittings, one at a time, until all air is out of the fluid. Lastly, finish the installation reverse way that the process started and also examine the working of the brake system and then restore the car to normalcy.

Genuine Mercedes-Benz Brake Master Cylinder

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58 Brake Master Cylinders found

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Mercedes-Benz Master Cylinder
Part Number: 223-431-07-00
$76.80 MSRP: $107.00
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Product Specifications
- Other Name: Rs Tandem Master Cylinder; Master Cylinder, Reservoir
Fits the following Mercedes-Benz Models:
- S580e | 2023 | 4Matic | 6 Cyl 3.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Mercedes-Benz Master Cylinder
Part Number: 213-430-00-00
$168.52 MSRP: $236.00
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Product Specifications
- Other Name: TS Master Brake Cylinder; Master Cylinder
Fits the following Mercedes-Benz Models:
- C300 | 2019-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- C43 AMG | 2019-2023 | 4Matic | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.0 L GAS
- C63 AMG | 2019-2021 | Base | 8 Cyl 4.0 L GAS
- C63 AMG S | 2023, 2019-2021 | Base | 8 Cyl 4.0 L GAS
- 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
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Mercedes-Benz Master Cylinder Assembly
Part Number: 204-430-05-01
$176.40 MSRP: $246.00
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Product Specifications
- Other Name: Master Brake Cylinder; Master Cylinder, Master Cylinder Assembly
- Replaces: 006-430-15-01
Fits the following Mercedes-Benz Models:
- C250 | 2012-2015 | Base, Luxury, Sport | 4 Cyl 1.8 L GAS
- C300 | 2008-2014 | 4Matic, 4Matic Luxury, 4Matic Sport, Luxury, Sport | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS, 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- C350 | 2008-2015 | 4Matic, Base, Sport | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- C63 AMG | 2008-2014 | Base | 8 Cyl 6.3 L GAS
- E350 | 2010-2014 | 4Matic, Base | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- E400 | 2015-2017 | 4Matic, Base | 6 Cyl 3.0 L GAS
- E550 | 2010-2017 | Base | 8 Cyl 4.7 L GAS, 8 Cyl 5.5 L GAS
- GLK250 | 2013-2015 | Bluetec 4Matic | 4 Cyl 2.1 L DIESEL
- GLK350 | 2010-2015 | 4Matic, Base | 6 Cyl 3.5 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 205-430-00-01
$177.60 MSRP: $248.00
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Product Specifications
- Other Name: TS Master Brake Cylinder
Fits the following Mercedes-Benz Models:
- C300 | 2015-2018 | 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 | 2017-2018 | 4Matic | 6 Cyl 3.0 L GAS
- C450 AMG | 2016 | 4Matic | 6 Cyl 3.0 L GAS
- C63 AMG | 2016-2018 | Base | 8 Cyl 4.0 L GAS
- C63 AMG S | 2015-2018 | Base | 8 Cyl 4.0 L GAS
- GLC300 | 2016-2019 | 4Matic, Base | 4 Cyl 2.0 L GAS
- GLC350e | 2018-2019 | 4Matic | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- GLC43 AMG | 2017-2019 | 4Matic | 6 Cyl 3.0 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 221-430-03-01
$178.80 MSRP: $250.00
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Product Specifications
- Other Name: Brake Master Cylinder; Master Cylinder
- Replaces: 221-430-00-01
Fits the following Mercedes-Benz Models:
- CL550 | 2007-2009 | 4Matic, Base | 8 Cyl 5.5 L GAS
- CL600 | 2007-2009 | Base | 12 Cyl 5.5 L GAS
- CL63 AMG | 2008-2009 | Base | 8 Cyl 6.3 L GAS
- CL65 AMG | 2008-2009 | Base | 12 Cyl 6.0 L GAS
- S550 | 2007-2009 | 4Matic, Base | 8 Cyl 5.5 L GAS
- S600 | 2007-2009 | Base | 12 Cyl 5.5 L GAS
- S63 AMG | 2008-2009 | Base | 8 Cyl 6.3 L GAS
- S65 AMG | 2007-2009 | Base | 12 Cyl 6.0 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 006-430-17-01
$159.60 MSRP: $222.00
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Product Specifications
- Other Name: Brake Master Cylinder; Master Cylinder
- Replaces: 006-430-13-01
Fits the following Mercedes-Benz Models:
- CLS500 | 2006 | Base | 8 Cyl 5.0 L GAS
- CLS55 AMG | 2006 | Base | 8 Cyl 5.5 L GAS
- CLS550 | 2007-2011 | Base | 8 Cyl 5.5 L GAS
- CLS63 AMG | 2007-2011 | Base | 8 Cyl 6.3 L GAS
- E320 | 2007-2009 | Bluetec | 6 Cyl 3.0 L DIESEL
- E350 | 2007-2009 | 4Matic, Base | 6 Cyl 3.5 L GAS
- E550 | 2007-2009 | 4Matic, Base | 8 Cyl 5.5 L GAS
- E63 AMG | 2007-2009 | Base | 8 Cyl 6.3 L GAS
- G500 | 2008 | Base | 8 Cyl 5.0 L GAS
- G55 AMG | 2008-2011 | Base | 8 Cyl 5.5 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 005-430-88-01-64
$201.60 MSRP: $280.00
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Product Specifications
- Other Name: TS Master Cylinder; Master Cylinder
- Replaces: 005-430-88-01
Fits the following Mercedes-Benz Models:
- CLK430 | 1999-2003 | Base | 8 Cyl 4.3 L GAS
- CLK55 AMG | 2001-2002 | Base | 8 Cyl 5.5 L GAS
- E430 | 2000-2002 | 4Matic | 8 Cyl 4.3 L GAS
- E55 AMG | 1999-2002 | Base | 8 Cyl 5.5 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 005-430-77-01
$253.20 MSRP: $352.00
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Product Specifications
- Other Name: Brake Master Cylinder
Fits the following Mercedes-Benz Models:
- C230 | 1998-1999 | Base, Kompressor | 4 Cyl 2.3 L GAS
- C280 | 1998-1999 | Base | 6 Cyl 2.8 L GAS
- CLK320 | 1998-1999 | Base | 6 Cyl 3.2 L GAS
- SLK230 | 1998-2000 | Kompressor | 4 Cyl 2.3 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 246-430-03-01
$195.60 MSRP: $272.00
You Save: $76.40 (29%)
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Product Specifications
- Other Name: TS Master Brake Cylinder
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 Master Cylinder
Part Number: 221-430-06-01
$186.00 MSRP: $260.00
You Save: $74.00 (29%)
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Product Specifications
- Other Name: TS Master Brake Cylinder
Fits the following Mercedes-Benz Models:
- CL550 | 2010-2014 | 4Matic | 8 Cyl 4.7 L GAS, 8 Cyl 5.5 L GAS
- CL600 | 2010-2014 | Base | 12 Cyl 5.5 L GAS
- CL63 AMG | 2010-2014 | Base | 8 Cyl 5.5 L GAS, 8 Cyl 6.3 L GAS
- CL65 AMG | 2010-2014 | Base | 12 Cyl 6.0 L GAS
- S350 | 2012-2013 | Bluetec 4Matic | 6 Cyl 3.0 L DIESEL
- S550 | 2010-2013 | 4Matic, Base | 8 Cyl 4.7 L GAS, 8 Cyl 5.5 L GAS
- S600 | 2010-2013 | Base | 12 Cyl 5.5 L GAS
- S63 AMG | 2010-2013 | Base | 8 Cyl 5.5 L GAS, 8 Cyl 6.3 L GAS
- S65 AMG | 2010-2013 | Base | 12 Cyl 6.0 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 246-430-05-01
$236.40 MSRP: $330.00
You Save: $93.60 (29%)
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Product Specifications
- Other Name: TS Master Brake Cylinder
Fits the following Mercedes-Benz Models:
- B Electric Drive | 2015 | Base | BATTERY EV (EV/BEV)
- B250e | 2016-2017 | Base | BATTERY EV (EV/BEV)
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Mercedes-Benz Master Cylinder
Part Number: 290-430-12-00
$202.80 MSRP: $282.00
You Save: $79.20 (29%)
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Product Specifications
- Other Name: TS Master Brake Cylinder; Master Cylinder
Fits the following Mercedes-Benz Models:
- AMG GT 43 | 2021-2023 | Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- AMG GT 53 | 2019-2023 | Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- AMG GT 63 | 2023, 2019-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT 63 S | 2023, 2019-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT 63 S E Performance | 2023 | Base | 8 Cyl 4.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- GLC63 AMG | 2020-2021 | 4Matic | 8 Cyl 4.0 L GAS
- GLC63 AMG S | 2020-2021 | 4Matic | 8 Cyl 4.0 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 177-430-55-00
$206.40 MSRP: $288.00
You Save: $81.60 (29%)
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Product Specifications
- Other Name: Master Brake Cylinder; Master Cylinder
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 | 2020-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS
- CLA35 AMG | 2020-2023 | 4Matic | 4 Cyl 2.0 L GAS
- CLA45 AMG | 2020-2023 | 4Matic | 4 Cyl 2.0 L GAS
- EQB 250 | 2023 | Base | BATTERY EV (EV/BEV)
- EQB 300 | 2022-2023 | 4Matic | BATTERY EV (EV/BEV)
- EQB 350 | 2022-2023 | 4Matic | BATTERY EV (EV/BEV)
- GLA250 | 2021-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS
- GLA35 AMG | 2021-2023 | 4Matic | 4 Cyl 2.0 L GAS
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Mercedes-Benz Master Cylinder Assembly
Part Number: 212-430-08-01
$207.60 MSRP: $290.00
You Save: $82.40 (29%)
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Product Specifications
- Other Name: TS Master Brake Cylinder; Master Cylinder, Master Cylinder Assembly
- Replaces: 212-430-00-01
Fits the following Mercedes-Benz Models:
- C63 AMG | 2012-2015 | Base, Black Series | 8 Cyl 6.3 L GAS
- CLS550 | 2012-2013 | 4Matic, Base | 8 Cyl 4.7 L GAS
- CLS63 AMG | 2012-2013 | Base | 8 Cyl 5.5 L GAS
- E350 | 2010-2013 | 4Matic, Base, Bluetec | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- E550 | 2010-2013 | 4Matic, Base | 8 Cyl 4.7 L GAS, 8 Cyl 5.5 L GAS
- E63 AMG | 2010-2013 | Base | 8 Cyl 5.5 L GAS, 8 Cyl 6.3 L GAS
- SL400 | 2015-2016 | Base | 6 Cyl 3.0 L GAS
- SL450 | 2017-2020 | Base | 6 Cyl 3.0 L GAS
- SL550 | 2013-2020 | Base | 8 Cyl 4.7 L GAS
- SL63 AMG | 2013-2019 | Base | 8 Cyl 5.5 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 166-430-00-01
$234.94 MSRP: $328.00
You Save: $93.06 (29%)
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Product Specifications
- Other Name: TS Master Brake Cylinder; Master Cylinder
Fits the following Mercedes-Benz Models:
- GLE550e | 2016-2018 | 4Matic | 6 Cyl 3.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Mercedes-Benz Master Cylinder
Part Number: 190-430-00-01
$259.20 MSRP: $360.00
You Save: $100.80 (28%)
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Product Specifications
- Other Name: TS Master Brake Cylinder; Master Cylinder
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 Master Cylinder
Part Number: 213-430-11-00
$232.80 MSRP: $324.00
You Save: $91.20 (29%)
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Product Specifications
- Other Name: TS Master Brake Cylinder; Master Cylinder
Fits the following Mercedes-Benz Models:
- E63 AMG S | 2018-2021 | 4Matic | 8 Cyl 4.0 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 222-430-00-00
$198.00 MSRP: $276.00
You Save: $78.00 (29%)
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Product Specifications
- Other Name: TS Master Brake Cylinder; Master Cylinder
Fits the following Mercedes-Benz Models:
- S450 | 2018-2020 | 4Matic, Base | 6 Cyl 3.0 L GAS
- S560 | 2018-2021 | 4Matic, Base | 8 Cyl 4.0 L GAS
- S560e | 2019-2020 | Base | 6 Cyl 3.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- S63 AMG | 2018-2021 | 4Matic | 8 Cyl 4.0 L GAS
- S65 AMG | 2018-2020 | Base | 12 Cyl 6.0 L GAS
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Mercedes-Benz Master Cylinder
Part Number: 164-430-04-01
$147.60 MSRP: $206.00
You Save: $58.40 (29%)
Product Specifications
- Other Name: Brake Master Cylinder
- Replaces: 164-430-00-01, 164-430-03-01
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
- 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
- R320 | 2007-2009 | Bluetec, CDI | 6 Cyl 3.0 L DIESEL
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Mercedes-Benz Master Cylinder
Part Number: 005-430-84-01
Product Specifications
- Other Name: Brake Master Cylinder
Fits the following Mercedes-Benz Models:
- C280 | 2000 | Base | 6 Cyl 2.8 L GAS
- CLK320 | 1998-2003 | Base | 6 Cyl 3.2 L GAS

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Mercedes-Benz Brake Master Cylinder

The brake master is a critical part of your vehicle's brakes. Once you step on the brakes, the pedal applies pressure, which is then converted into hydraulic pressure by the master cylinder by sending brake fluid through the lines. Quality Mercedes-Benz brake master cylinders made from top materials are designed to last; however, they eventually get worn out. An average repair cost ranges between $255 and $386 for professional repairs. However, there is a low-cost option of buying the part from us, doing the replacement yourself, and saving a lot of money.

Why go for OEM Mercedes-Benz Brake Master Cylinders? Because they are the optimal solutions, fit your vehicle perfectly, and are easy to install. Therefore, these factors help maintain the dependability and performance of your vehicle. At MBPartsGiant.com, you may find all the required genuine parts for your Mercedes-Benz. They are delivered from authorized Mercedes-Benz dealers directly via an uncomplicated online catalog. We guarantee promptness, reliability, and cheap sales on the Mercedes-Benz Brake Master Cylinder, and we always provide you with the right part at any time. Depend on our genuine Mercedes-Benz Brake Master Cylinders to keep your vehicle running smoothly.

Mercedes-Benz Brake Master Cylinder Parts and Q&A

Master Cylinder
005-430-26-01-64
Q: How to remove, overhaul, and refit of the Brake Master Cylinder on Mercedes-Benz 190E?
A:
You should know the hazards of hydraulic fluid before working on them. The first step should be to remove the battery negative terminal and the wiring connector on the level informer of brake fluid from the unit. Take out the master cylinder reservoir cap and siphon hydraulic fluid out of the reservoir, or open a bleed screw and press the brake pedal to pump the fluid out. When needed, remove the fluid hoses on the reservoir and seal off the ends in order to reduce leakage of fluids. Take your time when loading out the fluid reservoir of the master cylinder, do not touch the seals and seal the ports of the cylinder to avoid dirt infiltration. Clean up around the brake pipe unions, lay absorbent rags below them, record their correct locations, remove a union nut and take out the pipes, covering or taping the ends with rags to as much effect as possible not to lose the liquids or bring them inside. spindle and....... lifted away and then the two nuts and washers attaching the master cylinder to the vacuum servo unit, raising the unit up, take care not to tip over. Prior to assembling the master cylinder parts, verify the supply of spare parts as there are two types installed. Wipe the body of the master cylinder and the mounting seals on the fluid reservoir and record their proper locations. Hold the master cylinder body using a vice, and just press the piston in the cylinder to retract the secondary piston retaining pin. Download the piston with CIRclip, washer, and sealing ring, then take out the primary piston assembly and spring, and next the second piston and the spring, be notice of orientation. Wipe every part with appropriate cleaning pans even without using liquid based solvents and wipe them instantly. Inspect all parts of the design to determine if they are in good condition or worn or damaged, especially the cylinder bores, the pistons, etc., renewing those parts not in good condition. Just in case of the assembly is still usable, then get a repairing kit and re-do all the disrupted seals. Pre-pretreat the piston assemblies and new seals with clean hydraulic fluid and slide clean fluid into the cylinder bore during reassembly. Bend the spring to the secondary piston assembly and insert it by the master cylinder body with care not to entrap the piston seals. Place the secondary piston slot in place, slide it in place and then attach it with the retaining pin. Install the new primary piston assembly, and, where needed, install a new sealing ring at the end of the master cylinder and reinstall the washer and circlip, putting the circlip in the proper position. Insert the seals of the new fluid reservoir into the ports of the master cylinder. clean the mating-faces of the master cylinder and servo unit, replace old sealing ring on rear of master cylinder body and connect the master cylinder to servo unit, fitting them so they meet. Inspect (by refitting and tightening) the master cylinder retaining nuts, clean brake pipe unions and refit them to the master cylinder ports, and handfasten as directed. Then place the fluid reservoir in place and reconnect the fluid hoses as needed. Fill the master cylinder tank with new fluid and bleed the hydraulic system thoroughly, as the braking system has been tried and hence the car is ready to enter service again.
Master Cylinder
005-430-96-01-64
Q: How to the remove and install of the Brake Master Cylinder on Mercedes-Benz C230?
A:
The master cylinder can be removed by disconnecting the cable under the negative battery terminal and depressing heavily the brake pedal a few times to wash out vacuum in the power brake booster. Mark the cover on the ground and then twist the fittings on the master cylinder counterclockwise by a quarter and then place some rags under the master cylinder and wipe the area around the hydraulic line fittings with brake system cleaner without touching any of the paint. Withdraw as much of the fluid as you can out of the reservoir with a syringe and un-plug electrical connector of a brake fluid level warning switch. On models with manual transmission, disconnect the brake fluid line that leads to the clutch master cylinder reservoir, stuff rags into the fittings and prepare the line ends with caps or plastic bags. To avoid flattening corners in the brake lines to the master cylinder, replace the fittings at the ends with ones loosened with a flare-nut wrench. Be sure to pull brake lines carefully away of the master-cylinder and plug the ends to prevent contamination. Unscrew the electrical connector on the side of the master cylinder that fits into the socket of the electronic stability program brake pressure device; and, installing a second sensor in the front, also, unscrew another connector attached to the master cylinder upon its loosening. You can take off the sensor on the side prepared to leak brake fluid and remove the spring nut at the end of the master cylinder and then push down the front bracket and pull them up off the frame. Unscrew the master cylinder mounting nuts and move the master cylinder off the studs, working carefully not to tip or drop the component against the pushrod in the power brake booster or risk their destruction. When the master cylinder has taken off, un-connect the electrical connector on the bottom-front ESP brake pressure sensor (where appropriate). To install, place the brake pressure sensor(s) on the new master cylinder, and bleed it by placing it in a vise and connecting bleeder tubes to the outlet ports and by pushing the piston into place with a blunt tool as you fill the reservoir with the suggested brake fluid. Make sure to push the pistons gradually into the master cylinder and expel all the air until no more bubbles exist, and then unscrew the bleed tubes and replace them with plugs in the empty holes. Install a new vacuum seal on the master cylinder, lay a cover over reservoir, attach electrical connectors and place the master cylinder on the studs on the power brake booster screwing on nuts using finger tightening. Install the brake line fittings into the master cylinder being careful not to cross-thread the fittings, and screw the mounting nuts to the correct level of tight. Fit a new spring-nut and re-attach the front bracket, so that it is rotated inward about 5 mm beyond the terminus of the master cylinder. Fill the reservoir with the appropriate fluid, bleed the brake system; do not open the line fittings immediately, but have an assistant pump the brake pedal, loosen the line fittings, one at a time, until all air is out of the fluid. Lastly, finish the installation reverse way that the process started and also examine the working of the brake system and then restore the car to normalcy.

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