2003-2011 Audi A6/RS4/RS6/S4/S6 Brake Master Cylinder 4B3611021
OEM Part #: 4B3-611-021 (4B3611021)
Actual photo
The exact part you’ll receive — not a stock photo.
$12.99
Used
Donor2007 Audi RS4 · 4.2L
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Genuine OEM Used
SKU: 713158
Donor Vehicle: 2007 Audi RS4 · 4.2L
2 photos
$12.99
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Genuine OEM Used
SKU: 254840
Donor Vehicle: 2008 Audi S6 · 5.2L · 62k miles
2 photos
$13.71
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Genuine OEM Used
SKU: 517673
Donor Vehicle: 2005 Audi S4 · 4.2L
2 photos
$13.71
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Genuine OEM Used
SKU: 153532
Donor Vehicle: None Audi Multi Qty
2 photos
$13.71
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Genuine OEM Used
SKU: 324886
Donor Vehicle: 2008 Audi A6 · 4.2L
2 photos
$13.71
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Genuine OEM Used
SKU: 248320
Donor Vehicle: 2009 Audi A6 · 3.0
2 photos
$13.71
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Genuine OEM Used
SKU: 491892
Donor Vehicle: 2006 Audi A6 · 3.2L
2 photos
$13.71
30-Day Returns
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A used OEM Audi Brake Master Cylinder, part number 4B3611021, from a donor vehicle. This component converts pedal force into hydraulic pressure to actuate the brakes. Common failure symptoms include a soft or spongy brake pedal, fluid leaks near the reservoir, or the pedal sinking to the floor. It was removed from an Audi A6, S4, RS6, or similar model with engine options including the 2.8L V6, 3.0L supercharged V6, 4.2L V8, or 5.2L V10.
Specifications
| Fits Vehicle Model | A6, RS4, RS6, S4, S6 |
| Fits Vehicle Make | Audi |
| OEM Part No | 4B3-611-021 (4B3611021) |
| Category | Master Cylinder |
Compatible Vehicles
Fits 51 vehicle configurations across 1 make, 2003-2011.
Check your specific vehicle before ordering.
This list shows year, make, and model. Some years have multiple trims or
engines that use different parts, and individual listings may have
additional fitment notes (e.g. “with sunroof only”). Review
the full variant list below, or
message us with your VIN
and we’ll confirm the match.
View all 51 vehicle configurations
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2010 | Audi | A6 | Quattro Wagon | 3.0L V6 Supercharged | |
| 2010 | Audi | A6 | Sedan | 3.2L V6 | |
| 2011 | Audi | A6 | Sedan | 3.2L V6 | |
| 2009 | Audi | A6 | Sedan | 3.2L V6 | |
| 2009 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2011 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2011 | Audi | S6 | Sedan | 5.2L V10 | |
| 2011 | Audi | A6 | Quattro Wagon | 3.0L V6 Supercharged | |
| 2011 | Audi | A6 | Quattro Sedan | 3.0L V6 Supercharged | |
| 2010 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2009 | Audi | A6 | Quattro Sedan | 3.0L V6 Supercharged | |
| 2008 | Audi | S4 | Convertible | 4.2L V8 | |
| 2008 | Audi | S4 | Sedan | 4.2L V8 | |
| 2007 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2006 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2007 | Audi | S6 | Sedan | 5.2L V10 | |
| 2007 | Audi | S4 | Wagon | 4.2L V8 | |
| 2005 | Audi | S4 | Convertible | 4.2L V8 | |
| 2005 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2007 | Audi | A6 | Quattro Wagon | 3.2L V6 | |
| 2007 | Audi | S4 | Convertible | 4.2L V8 | |
| 2007 | Audi | RS4 | Sedan | 4.2L V8 | |
| 2006 | Audi | S4 | Convertible | 4.2L V8 | |
| 2006 | Audi | S4 | Sedan | 4.2L V8 | |
| 2004 | Audi | S4 | Convertible | 4.2L V8 | |
| 2007 | Audi | A6 | Quattro Sedan | 3.2L V6 | |
| 2003 | Audi | RS6 | Sedan | 4.2L V8 Turbo | |
| 2005 | Audi | S4 | Sedan | 4.2L V8 | |
| 2008 | Audi | RS4 | Convertible | 4.2L V8 | |
| 2008 | Audi | S4 | Wagon | 4.2L V8 | |
| 2009 | Audi | S6 | Sedan | 5.2L V10 | |
| 2008 | Audi | A6 | Quattro Wagon | 3.2L V6 | |
| 2010 | Audi | A6 | Quattro Sedan | 3.0L V6 Supercharged | |
| 2009 | Audi | A6 | Quattro Wagon | 3.0L V6 Supercharged | |
| 2006 | Audi | S4 | Wagon | 4.2L V8 | |
| 2006 | Audi | A6 | Quattro Wagon | 3.2L V6 | |
| 2009 | Audi | S4 | Convertible | 4.2L V8 | |
| 2005 | Audi | A6 | Quattro Sedan | 3.2L V6 | |
| 2004 | Audi | S4 | Wagon | 4.2L V8 | |
| 2008 | Audi | A6 | Quattro Sedan | 4.2L V8 | |
| 2010 | Audi | S6 | Sedan | 5.2L V10 | |
| 2008 | Audi | S6 | Sedan | 5.2L V10 | |
| 2008 | Audi | RS4 | Sedan | 4.2L V8 | |
| 2006 | Audi | A6 | Quattro Sedan | 3.2L V6 | |
| 2004 | Audi | S4 | Sedan | 4.2L V8 | |
| 2005 | Audi | S4 | Wagon | 4.2L V8 | |
| 2007 | Audi | A6 | Sedan | 3.2L V6 | |
| 2007 | Audi | S4 | Sedan | 4.2L V8 | |
| 2006 | Audi | A6 | Sedan | 3.2L V6 | |
| 2008 | Audi | A6 | Quattro Sedan | 3.2L V6 | |
| 2008 | Audi | A6 | Sedan | 3.2L V6 |