What precautions should be taken regarding the Brake Master Cylinder before starting work to address the dangers of hydraulic fluid on Audi 100?

Prior to going to work, remember to deal with the risks of hydraulic fluid. Wipe off the master cylinder fluid reservoir and take off the cap. Place a container below the outlet of the clutch master cylinder fluid, loosen the retaining clip and detach the hose of the clutch master cylinder as well as the ABS hydraulic unit hose (where applicable). It is recommended that the reservoir should be emptied into the container with the hose ends plugged to ensure that the fluids are not wasted and dirt is not introduced into the set up. Unfitting of the wiring plug to the level sender unit of brake fluid, clean up around the unions of brake pipe on the master cylinder, and place absorbent rags under to absorb any excess fluid. Record the proper locations of the unions, unscrew them, and stuff in the ends and holes of the pipes to reduce the loss of brake fluid and dirt intrusion, and wash the spilled fluid with cold water. Disassemble the two nuts holding the master cylinder onto the vacuum servo unit and pull the unit out of the engine compartment removing the sealing ring and preparing to install a new one when reassembling. In case the master cylinder is defective, it should be removed and replaced with another one, the mounting seals of the fluid reservoir can be replaced in case they are worn out, but repair kits are not provided. Apply clean brake fluid to new seals and be sure that they are properly fitted, especially the rear seal, which must protrude some 1 mm of its housing. Once the seals are fitted in place, place the fluid reservoir in place. Wipe off the mating surfaces of the master cylinder and servo unit, replace the sealing ring, and connect the master cylinder to the servo unit making sure that the parts are aligned. Install the mounting nuts again, clean the brake pipe unions, and rejoin them to the master cylinder ports and tighten them to the required torque. Re-attach the hoses to the reservoir and ensure that the retaining clips are tightened, re-attach the wiring of the fluid level sender unit, refill the master cylinder reservoir with new fluid and bleed off the entire hydraulic system.

How to remove and install the Brake Master Cylinder on Audi A6?

Remove the rubber molding from the rear bulkhead of the Engine Compartment and pull the plenum chamber cover forward to remove it. Remove the brake fluid reservoir cap and use a siphon to drain the brake fluid out of the fluid reservoir. For manual transmission vehicles, disconnect and plug the clutch master cylinder supply hose. Disconnect the harness connector for the brake fluid level switch. While working underneath the brake fluid reservoir, disconnect the brake lines at the brake master cylinder and immediately seal the brake lines while plugging the brake fluid ports. Detach the M16 mounting nuts securing the brake master cylinder, and carefully remove the brake master cylinder from the brake booster. When fitting the brake master cylinder, make sure that you use pushrod on brake master cylinder. Then apply slight pressure on the brake pedal so that the pushrod moves towards brake master cylinder. This will make it easier to guide brake master cylinder on pushrod. The brake system has been flushed and bled.

Genuine Audi Brake Master Cylinder

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54 Brake Master Cylinders found

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Audi Master Cylinder Part Number: 8K0-611-021-A
$497.42 MSRP: $696.67
You Save: $199.25 (29%)
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Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- A4 | 2009-2012 | Base | 4 Cyl 2.0 L GAS
- A4 Quattro | 2009-2012 | Avant, Base | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- A5 | 2010-2012 | Cabriolet | 4 Cyl 2.0 L GAS
- A5 Quattro | 2008-2012 | Base, Cabriolet | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- allroad | 2013-2016 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L FLEX
- Q5 | 2009-2017 | Premium, Premium Plus, Prestige, TDI Premium Plus, TDI Premium Plus S-Line, TDI Prestige, TDI Prestige S-Line | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- S4 | 2010-2012 | Base | 6 Cyl 3.0 L GAS
- S5 | 2008-2012 | Base, Cabriolet | 6 Cyl 3.0 L GAS, 8 Cyl 4.2 L GAS
- SQ5 | 2014-2017 | Premium Plus, Prestige | 6 Cyl 3.0 L GAS
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Audi Master Cylinder Part Number: 4G1-611-021-C
$517.65 MSRP: $725.01
You Save: $207.36 (29%)
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Product Specifications
- Other Name: Cylinder
- Replaces: 4G1-611-021-A, 4G1-611-021
Fits the following Audi Models:
- A6 | 2012-2018 | Premium, Premium Plus, Sport | 4 Cyl 2.0 L GAS
- A6 Quattro | 2012-2018 | Premium, Premium Plus, Prestige, Sport, TDI Premium Plus, TDI Prestige | 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS
- A7 Quattro | 2012-2018 | Base, Competition, Premium Plus, Prestige, TDI Premium Plus, TDI Prestige | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS
- RS7 | 2014-2018 | Base, Performance | 8 Cyl 4.0 L GAS
- S6 | 2013-2018 | Base, Premium Plus, Prestige | 8 Cyl 4.0 L GAS
- S7 | 2013-2018 | Base, Premium Plus, Prestige | 8 Cyl 4.0 L GAS
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Audi Master Cylinder Part Number: 1EB-614-019-A
$100.75 MSRP: $141.10
You Save: $40.35 (29%)
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Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- Q4 e-tron | 2022-2025 | Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- Q4 e-tron Sportback | 2022-2025 | Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
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Audi Master Cylinder Part Number: 3Q1-614-019-E
$172.22 MSRP: $241.20
You Save: $68.98 (29%)
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Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- S3 | 2022-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi Master Cylinder Part Number: 4K0-612-107-E
$203.94 MSRP: $285.63
You Save: $81.69 (29%)
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Product Specifications
- Other Name: Brake Servo; Brake Booster, Power Booster
Fits the following Audi Models:
- RS6 Avant | 2021-2025 | Base, GT, Performance | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
- RS7 Sportback | 2021-2025 | Base, Performance | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Master Cylinder Part Number: 3Q1-614-019-D
$220.11 MSRP: $308.28
You Save: $88.17 (29%)
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Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- A3 | 2022-2024 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A3 Quattro | 2022-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Booster Assembly Part Number: 4K0-612-107-F
$223.90 MSRP: $313.58
You Save: $89.68 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Brake Servo; Brake Booster, Master Cylinder, Power Booster
Fits the following Audi Models:
- RS Q8 | 2020-2025 | Base | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
- RS6 Avant | 2021-2025 | Base, GT, Performance | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
- RS7 Sportback | 2021-2025 | Base, Performance | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Master Cylinder Part Number: 5Q1-614-019-AD-REP
$227.40 MSRP: $318.49
You Save: $91.09 (29%)
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Product Specifications
- Other Name: Cylinder
- Replaces: 5Q1-614-019-S-REP, 5Q1-614-019-N-REP, 5Q1-614-019-AB-REP, 8V1-611-021-B
Fits the following Audi Models:
- A3 | 2018-2019 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- A3 Quattro | 2018-2019 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- Q3 | 2019-2025 | Premium, Premium Plus, Prestige, S-Line Premium, S-Line Premium Plus, S-Line Prestige | 4 Cyl 2.0 L GAS
- RS3 | 2017-2020 | Base | 5 Cyl 2.5 L GAS
- S3 | 2015-2020 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- TT RS Quattro | 2018-2022 | Base, Heritage Edition | 5 Cyl 2.5 L GAS
- TTS Quattro | 2016-2023 | Base | 4 Cyl 2.0 L GAS
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Audi Master Cylinder Part Number: 8E0-611-021-B
$250.09 MSRP: $350.27
You Save: $100.18 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cylinder
- Replaces: 8E0-611-021-A
Fits the following Audi Models:
- A4 | 2003-2008 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- A4 Quattro | 2003-2008 | Avant, Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- A6 | 2002-2004 | Base | 6 Cyl 3.0 L GAS
- A6 Quattro | 2002-2004 | Avant, Base | 6 Cyl 2.7 L GAS, 6 Cyl 3.0 L GAS, 8 Cyl 4.2 L GAS
- RS6 | 2004 | Base | 8 Cyl 4.2 L GAS
- S6 | 2002-2003 | Avant | 8 Cyl 4.2 L GAS
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Audi Master Cylinder Part Number: 1J1-614-019-F
$256.14 MSRP: $358.73
You Save: $102.59 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cylinder
- Replaces: 1J1-614-019-C
Fits the following Audi Models:
- TT | 2002 | Base | 4 Cyl 1.8 L GAS
- TT Quattro | 2002 | ALMS Edition, Base | 4 Cyl 1.8 L GAS
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Audi Master Cylinder Part Number: 1K1-614-019-K
$274.88 MSRP: $384.98
You Save: $110.10 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cylinder
- Replaces: 1K1-614-019, 1K1-614-019-D
Fits the following Audi Models:
- A3 | 2006-2013 | Base, TDI | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
- A3 Quattro | 2006-2013 | Base | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
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Audi Master Cylinder Part Number: 8R0-611-021-C
$419.46 MSRP: $587.48
You Save: $168.02 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- Q5 | 2013-2016
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Audi Master Cylinder Part Number: 4G1-611-021-B
$415.31 MSRP: $581.67
You Save: $166.36 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- A6 Quattro | 2016-2018 | Competition, Premium, Premium Plus, Prestige, Sport, TDI Premium Plus, TDI Prestige | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS
- A7 Quattro | 2016-2018 | Competition, Premium Plus, Prestige, TDI Premium Plus, TDI Prestige | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS
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Audi Master Cylinder Part Number: 8T0-611-021
$553.70 MSRP: $775.49
You Save: $221.79 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- RS5 | 2013-2015 | Base, Cabriolet | 8 Cyl 4.2 L GAS
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Audi Master Cylinder Part Number: 4N0-611-021-D-REP
$200.94 MSRP: $281.43
You Save: $80.49 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cylinder
- Replaces: 4N0-611-021, 4N0-611-021-E, 4N0-611-021-A
Fits the following Audi Models:
- A8 Quattro | 2019-2025 | L | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
- RS5 | 2021-2024, 2018-2019 | Base | 6 Cyl 2.9 L GAS
- RS5 Sportback | 2021-2024, 2019 | Base | 6 Cyl 2.9 L GAS
- RS6 Avant | 2021-2025 | Base, GT, Performance | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
- RS7 Sportback | 2021-2025 | Base, Performance | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
- S8 | 2020-2025 | Base | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Master Cylinder Part Number: 4K0-614-019
$200.94 MSRP: $281.43
You Save: $80.49 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- A7 Sportback | 2021-2022 | Premium Plus, Prestige | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- Q5 | 2021-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- Q5 PHEV | 2020-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- Q5 Sportback | 2021-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Master Cylinder Part Number: 8D0-611-021-B
$242.76 MSRP: $340.00
You Save: $97.24 (29%)
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Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- A4 | 1996-1999 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
- A4 Quattro | 1996-1999 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
- A6 | 1998-1999 | Base | 6 Cyl 2.8 L GAS
- A6 Quattro | 1998-1999 | Avant, Base | 6 Cyl 2.8 L GAS
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Audi Master Cylinder Part Number: 3Q1-614-019-F
$258.81 MSRP: $362.48
You Save: $103.67 (29%)
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Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- RS3 | 2022-2025 | Base | 5 Cyl 2.5 L GAS
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Audi Master Cylinder Part Number: 1K1-614-019-F
$261.79 MSRP: $366.65
You Save: $104.86 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder
- Replaces: 1K1-614-019-B
Fits the following Audi Models:
- A3 | 2006-2008 | Base | 4 Cyl 2.0 L GAS
- A3 Quattro | 2006-2008 | Base | 6 Cyl 3.2 L GAS
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Audi Master Cylinder Part Number: 8E0-611-021
$271.75 MSRP: $380.61
You Save: $108.86 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder
Fits the following Audi Models:
- A4 | 2002-2009 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- A4 Quattro | 2002-2009 | Avant, Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- A6 | 2002 | Base | 6 Cyl 3.0 L GAS
- A6 Quattro | 2002 | Avant, Base | 6 Cyl 2.7 L GAS, 6 Cyl 3.0 L GAS, 8 Cyl 4.2 L GAS
- S6 | 2002 | Avant | 8 Cyl 4.2 L GAS
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Audi Brake Master Cylinder

Audi Brake Master Cylinder provides immediate and balanced stopping power by converting your foot pressure into precise hydraulic force and provides every driver with steady confidence at any speed. In every Audi, this Brake Master Cylinder implements a dual circuit design that ensures the brakes remain functional on two wheels in the unlikely event one line loses pressure and tough aluminum or cast iron housing protects the paired pistons, seals, and springs from heat and vibration, ensuring crisp response during the daily commute or spirited drive. A secure reservoir feeds fluid through airtight ports to keep out bubbles and maintain pedal feel, while carefully routed lines take the pressure to calipers or drums for consistent, fade resistant halts, proving the Brake Master Cylinder is central to overall vehicle safety. Beyond this vital component, Audi wows enthusiasts with Quattro all wheel drive that claws through rain or snow, sleek sedans and SUVs that combine athletic handling with comfort and smart cabin tech like Virtual Cockpit and matrix headlights that light the road and info displays with clarity. The e-tron series demonstrates Audi's commitment to electric mobility and ongoing autonomous trials give a glimpse of tomorrow's convenience. Strong build quality, innovative engineering, and a proud heritage which began in 1909 make Audi a benchmark in modern performance and luxury, while pairing these vehicles with a trustworthy Brake Master Cylinder completes a package that values safety as much as speed.

Stick with genuine OEM Brake Master Cylinder when you need quality that holds up. Audi crafts these parts to hit strict factory specs for every single unit. They also run each part through rigorous checks during production to maintain high quality. You can find exact Audi Brake Master Cylinder you need in our huge stock at AudiPartsGiant.com. You'll love our low, economical prices too. Every OEM part carries a real manufacturer's warranty, so you can buy with confidence. Returns aren't a headache here because our policy is simple. Plus, our speedy delivery gets orders out fast. Shop today and buy with total peace of mind.

Audi Brake Master Cylinder Parts and Q&A

Master Cylinder
4A0-611-021-D
Q: What precautions should be taken regarding the Brake Master Cylinder before starting work to address the dangers of hydraulic fluid on Audi 100?
A:
Prior to going to work, remember to deal with the risks of hydraulic fluid. Wipe off the master cylinder fluid reservoir and take off the cap. Place a container below the outlet of the clutch master cylinder fluid, loosen the retaining clip and detach the hose of the clutch master cylinder as well as the ABS hydraulic unit hose (where applicable). It is recommended that the reservoir should be emptied into the container with the hose ends plugged to ensure that the fluids are not wasted and dirt is not introduced into the set up. Unfitting of the wiring plug to the level sender unit of brake fluid, clean up around the unions of brake pipe on the master cylinder, and place absorbent rags under to absorb any excess fluid. Record the proper locations of the unions, unscrew them, and stuff in the ends and holes of the pipes to reduce the loss of brake fluid and dirt intrusion, and wash the spilled fluid with cold water. Disassemble the two nuts holding the master cylinder onto the vacuum servo unit and pull the unit out of the engine compartment removing the sealing ring and preparing to install a new one when reassembling. In case the master cylinder is defective, it should be removed and replaced with another one, the mounting seals of the fluid reservoir can be replaced in case they are worn out, but repair kits are not provided. Apply clean brake fluid to new seals and be sure that they are properly fitted, especially the rear seal, which must protrude some 1 mm of its housing. Once the seals are fitted in place, place the fluid reservoir in place. Wipe off the mating surfaces of the master cylinder and servo unit, replace the sealing ring, and connect the master cylinder to the servo unit making sure that the parts are aligned. Install the mounting nuts again, clean the brake pipe unions, and rejoin them to the master cylinder ports and tighten them to the required torque. Re-attach the hoses to the reservoir and ensure that the retaining clips are tightened, re-attach the wiring of the fluid level sender unit, refill the master cylinder reservoir with new fluid and bleed off the entire hydraulic system.
Master Cylinder
4D0-611-021-A
Q: How to remove and install the Brake Master Cylinder on Audi A6?
A:
Remove the rubber molding from the rear bulkhead of the Engine Compartment and pull the plenum chamber cover forward to remove it. Remove the brake fluid reservoir cap and use a siphon to drain the brake fluid out of the fluid reservoir. For manual transmission vehicles, disconnect and plug the clutch master cylinder supply hose. Disconnect the harness connector for the brake fluid level switch. While working underneath the brake fluid reservoir, disconnect the brake lines at the brake master cylinder and immediately seal the brake lines while plugging the brake fluid ports. Detach the M16 mounting nuts securing the brake master cylinder, and carefully remove the brake master cylinder from the brake booster. When fitting the brake master cylinder, make sure that you use pushrod on brake master cylinder. Then apply slight pressure on the brake pedal so that the pushrod moves towards brake master cylinder. This will make it easier to guide brake master cylinder on pushrod. The brake system has been flushed and bled.