How to remove and reinstall the Brake Booster and master cylinder assembly on Audi A6?

Pull off rubber molding at the engine compartment rear bulkhead and remove the plenum chamber cover. Unscrew the brake fluid reservoir cap and siphon out as much brake fluid as possible from the fluid reservoir. For manual transmission vehicles, disconnect the clutch master cylinder supply hose and seal it with a plug. Disconnect the brake fluid level warning switch harness connector and the brake booster vacuum hose. Below the brake fluid reservoir, disconnect the brake lines at the brake master cylinder, immediately sealing the brake lines and plugging the brake fluid ports. Remove the Torx T45 bolts mounting the master cylinder and booster assembly to the bulkhead. In the passenger compartment, tilt the steering column down and remove the trim under the instrument cluster, along with the trim panel fasteners. Remove the lower trim fasteners and pull down the trim panels under the steering column to access the pedal cluster. Working under the dashboard above the pedals, remove the brake light switch. Insert the disengaging tool between the brake pedal and the ball head of the brake booster pushrod, pulling back on the tool and brake pedal simultaneously while holding the brake pedal securely. Pry the retaining tabs from the ball head by pulling lightly on the tool, keeping tension on the tool to prevent the retaining tabs from reengaging, and then pull the brake pedal from the ball head. Remove the brake master cylinder and booster from the plenum chamber, checking and resetting the brake booster pushrod length prior to installation. When measuring, ensure the ball head is at a right angle to the surface of the brake booster, measuring from the end of the ball head to the metal base of the booster. Installation is the reverse of removal, paying particular attention to reinstalling and adjusting the brake light switch and the brake and clutch pedal cruise control vent valve switches, followed by flushing and bleeding the brake system.

Genuine Audi A6 Brake Booster

Brake Power Booster

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13 Brake Boosters found

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Audi A6 Booster Assembly Part Number: 8K0-612-107-D
$384.37 MSRP: $538.33
You Save: $153.96 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Brake Servo; Brake Booster, Power Booster
- Replaces: 4G0-612-107-A, 4G0-612-107
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2012-2015 Audi A6 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
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Audi A6 Booster Assembly Part Number: 8E0-612-107-J
$398.64 MSRP: $558.32
You Save: $159.68 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Brake Servo; Brake Booster
- Replaces: 8E0-612-107, 8E0-612-107-E, 8E0-612-107-C, 8E0-612-107-A
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2002 Audi A6 | Base | 6 Cyl 3.0 L GAS
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Audi A6 Power Booster Part Number: 4G0-612-107-E
$869.89 MSRP: $1124.61
You Save: $254.72 (23%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Brake Servo; Brake Booster
- Replaces: 4G0-612-107-B
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2016-2018 Audi A6 | Premium, Premium Plus, Sport | 4 Cyl 2.0 L GAS
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Audi A6 Booster Assembly Part Number: 8E0-612-107-F
$373.66 MSRP: $523.33
You Save: $149.67 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Brake Servo; Brake Booster
- Replaces: 8E0-612-107-B
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2002-2004 Audi A6 | Base | 6 Cyl 3.0 L GAS
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Audi A6 Booster Assembly Part Number: 4B3-612-107
$410.55 MSRP: $575.00
You Save: $164.45 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Brake Servo
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1999-2001 Audi A6 | Base | 6 Cyl 2.8 L GAS
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Audi A6 Brake Booster Part Number: 4F0-612-107-E
$574.16 MSRP: $804.15
You Save: $229.99 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Brake Servo; Power Booster
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006 Audi A6 | Base | 6 Cyl 3.2 L GAS
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Audi A6 Power Booster Part Number: 4F0-612-107-F
$622.72 MSRP: $805.06
You Save: $182.34 (23%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Brake Servo; Brake Booster
- Replaces: 4F0-612-107-D
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2011 Audi A6 | Base | 6 Cyl 3.2 L GAS
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Audi A6 Brake Booster Part Number: 4G0-612-107-F
$773.49 MSRP: $999.99
You Save: $226.50 (23%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Brake Servo; Power Booster
- Replaces: 4G0-612-107-C
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2016-2018 Audi A6 | Premium, Premium Plus, Sport | 4 Cyl 2.0 L GAS
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Audi A6 Pressure Metering Valve Part Number: 443-614-151-H
$250.61 MSRP: $351.00
You Save: $100.39 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Regulator; ABS Regulator, Brake Booster
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1995-1996 Audi A6 | Avant | 6 Cyl 2.8 L GAS
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Audi A6 Brake Booster Part Number: 4A0-612-107-A
$322.73 MSRP: $452.00
You Save: $129.27 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Brake Servo
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1995-1997 Audi A6 | Avant, Base | 6 Cyl 2.8 L GAS
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Audi A6 Pressure Metering Valve Part Number: 443-614-151-B
$413.26 MSRP: $578.80
You Save: $165.54 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Regulator; Brake Booster
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1995-1996 Audi A6 | Avant | 6 Cyl 2.8 L GAS
View related parts
Audi A6 Booster Assembly Part Number: 8D0-612-107-B
Product Specifications
- Other Name: Brake Servo; Brake Booster
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1998-1999 Audi A6 | Base | 6 Cyl 2.8 L GAS
View related parts
Audi A6 Booster Assembly Part Number: 4D0-612-107-B
Product Specifications
- Other Name: Brake Servo; Brake Booster
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2000-2001 Audi A6 | Base | 6 Cyl 2.8 L GAS

Audi A6 Brake Booster

The Audi A6 Brake Booster converts a slight tap of the brake pedal to a high level of hydraulic force, which provides the Audi sedan with quick, confident stops without exhausting the muscles of the driver's leg. This small Brake Booster unit, which fits between the pedal arm and the master cylinder, amplifies the input pressure so the braking system can be clamped to full power in a matter of seconds, an obvious benefit in the event of a traffic jam or in case of a wet road incident. The majority of the Audi trims have the vacuum style units which utilize the pressure difference between the engine intake and the outside air to flex a diaphragm and push the piston forward with amazing consistency, although higher demand versions with the same muscular assist are fitted when the Audi engine vacuum drops below the turbo boost or in diesel cruising. With whichever style you pick beneath the hood, the Brake Booster component offers two backup assists in case the engine does stop, with composure for the steering wheel and confidence for the passengers. The direct bolt-on compatibility will be welcomed by the owners of all A6 generations between the initial C4 saloon and the present C8 Avant; replacement will entail no clumsy adapters and will preserve the factory pedal feel. The fact that it has a long service lifetime makes it strong on the image front and the internal seals and check valves are meant to withstand years of temperature changes and stop and go traffic. Electronic safety systems like ABS and stability control also react quicker, as plentiful hydraulic pressure is available immediately when the sensors demand it, and this increases fuel efficiency as the smaller diameter master cylinders can easily perform the same task with less drag. It has subtle stealth operation, self-centring connection and that clever dual-design style that makes this Brake Booster shine against many other parts and assures the Audi owner of the last stage of smooth deceleration tradition and at the same time makes the new Audi A6 remain up to current safety standards.

Choose original equipment manufacturer Brake Booster for great performance and strong durability. They use Audi's official craftsmanship and high-grade materials, and meet strict quality standards. Are you looking for quality Brake Booster at a good price? Come to our online store. We carry a wide range of genuine parts for your Audi A6 and the prices are competitive. Each part comes with the manufacturer's warranty. You can install with confidence and get steady results. Over time, you'll save money and avoid hassle. Keep your maintenance simple and protect your vehicle with OEM parts. Get the quality your A6 needs now.

Audi A6 Brake Booster Parts and Q&A

Booster Assembly
4B3-612-107
Q: How to remove and reinstall the Brake Booster and master cylinder assembly on Audi A6?
A:
Pull off rubber molding at the engine compartment rear bulkhead and remove the plenum chamber cover. Unscrew the brake fluid reservoir cap and siphon out as much brake fluid as possible from the fluid reservoir. For manual transmission vehicles, disconnect the clutch master cylinder supply hose and seal it with a plug. Disconnect the brake fluid level warning switch harness connector and the brake booster vacuum hose. Below the brake fluid reservoir, disconnect the brake lines at the Brake Master Cylinder, immediately sealing the brake lines and plugging the brake fluid ports. Remove the Torx T45 bolts mounting the master cylinder and booster assembly to the bulkhead. In the passenger compartment, tilt the steering column down and remove the trim under the instrument cluster, along with the trim panel fasteners. Remove the lower trim fasteners and pull down the trim panels under the steering column to access the pedal cluster. Working under the dashboard above the pedals, remove the brake light switch. Insert the disengaging tool between the brake pedal and the ball head of the brake booster pushrod, pulling back on the tool and brake pedal simultaneously while holding the brake pedal securely. Pry the retaining tabs from the ball head by pulling lightly on the tool, keeping tension on the tool to prevent the retaining tabs from reengaging, and then pull the brake pedal from the ball head. Remove the brake master cylinder and booster from the plenum chamber, checking and resetting the brake booster pushrod length prior to installation. When measuring, ensure the ball head is at a right angle to the surface of the brake booster, measuring from the end of the ball head to the metal base of the booster. Installation is the reverse of removal, paying particular attention to reinstalling and adjusting the brake light switch and the brake and clutch pedal cruise control vent valve switches, followed by flushing and bleeding the brake system.