Audi A4/A5/A8/S4/S5/S8/allroad Brake Master Cylinder 8K0611021B
OEM Part #: 8K0-611-021-B (8K0611021B)
Actual photo
The exact part you’ll receive — not a stock photo.
$99.99
Used
Donor Vehicle2017 Audi A8 · 3.0L
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Genuine OEM Used
SKU: 728701
Donor Vehicle: 2017 Audi A8 · 3.0L
2 photos
$99.99
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This genuine Audi Brake Master Cylinder, OEM part number 8K0611021B, is essential for hydraulic brake system performance in models such as the 2011-2018 Audi A8, S8, A4, A5, and S4. Located within the master cylinder assembly, it is responsible for generating the hydraulic pressure needed to activate the brakes. Common issues this part resolves include loss of braking efficiency due to wear or damage. The master cylinder may also be referred to as a brake cylinder or hydraulic cylinder. Compatible with a range of engines including 2.0L L4, 3.0L V6, and 4.0L V8, this authentic OEM component ensures reliable braking performance, maintaining your vehicle's safety. Other compatible part numbers include 4H0611021, and it's manufactured by Girling-TRW.
Specifications
| Fits Vehicle Model | A4, A5, A8, allroad, S4, S5, S8 |
| Fits Vehicle Make | Audi |
| OEM Part No | 8K0-611-021-B (8K0611021B) |
| Compatible OEM Part No | 8K0-611-021 |
| Category | Master Cylinder |
Compatible Vehicles
Fits 76 vehicle configurations across 1 make, 2008-2018.
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 76 vehicle configurations — 11 with fitment notes
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2016 | Audi | allroad | Wagon | 2.0L l4 Turbo | |
| 2015 | Audi | allroad | Wagon | 2.0L l4 Turbo | |
| 2014 | Audi | allroad | Wagon | 2.0L l4 Turbo | |
| 2013 | Audi | allroad | Wagon | 2.0L l4 Turbo | |
| 2010 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | |
| 2009 | Audi | A4 | Sedan | 2.0L l4 Turbo | |
| 2011 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | |
| 2010 | Audi | A5 | Convertible | 2.0L l4 Turbo | |
| 2009 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | |
| 2011 | Audi | A4 | Quattro Wagon | 2.0L l4 Turbo | |
| 2010 | Audi | A4 | Sedan | 2.0L l4 Turbo | |
| 2012 | Audi | A5 | Quattro Coupe | 2.0L l4 Turbo | For Vehicles with Production Date After 06/02/08 |
| 2012 | Audi | A5 | Convertible | 2.0L l4 Turbo | |
| 2012 | Audi | A5 | Quattro Convertible | 2.0L l4 Turbo | |
| 2011 | Audi | A5 | Quattro Convertible | 2.0L l4 Turbo | |
| 2011 | Audi | A5 | Convertible | 2.0L l4 Turbo | |
| 2011 | Audi | A5 | Quattro Coupe | 2.0L l4 Turbo | For Vehicles with Production Date After 06/02/08 |
| 2012 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | |
| 2010 | Audi | A5 | Quattro Coupe | 2.0L l4 Turbo | For Vehicles with Production Date After 06/02/08 |
| 2011 | Audi | A4 | Sedan | 2.0L l4 Turbo | |
| 2009 | Audi | A4 | Quattro Wagon | 2.0L l4 Turbo | |
| 2010 | Audi | A4 | Quattro Wagon | 2.0L l4 Turbo | |
| 2012 | Audi | A4 | Sedan | 2.0L l4 Turbo | |
| 2010 | Audi | A5 | Quattro Convertible | 2.0L l4 Turbo | |
| 2012 | Audi | A4 | Quattro Wagon | 2.0L l4 Turbo | |
| 2010 | Audi | A5 | Quattro Coupe | 3.2L V6 | For Vehicles with Production Date After 06/02/08 |
| 2014 | Audi | A8 | Quattro L Sedan | 3.0L V6 Supercharged | |
| 2014 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2013 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2014 | Audi | A8 | Quattro Sedan | 3.0L V6 Supercharged | |
| 2014 | Audi | A8 | Quattro L Sedan | 3.0L V6 Diesel Turbo | |
| 2014 | Audi | A8 | Quattro Sedan | 4.0L V8 Turbo | |
| 2013 | Audi | A8 | Quattro Sedan | 4.0L V8 Turbo | |
| 2014 | Audi | A8 | Quattro L Sedan | 6.3L W12 | |
| 2014 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2013 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2008 | Audi | S5 | Coupe | 4.2L V8 | For Vehicles with Production Date After 06/02/08 |
| 2009 | Audi | S5 | Coupe | 4.2L V8 | For Vehicles with Production Date After 06/02/08 |
| 2010 | Audi | S5 | Coupe | 4.2L V8 | For Vehicles with Production Date After 06/02/08 |
| 2010 | Audi | S4 | Sedan | 3.0L V6 Supercharged | |
| 2010 | Audi | S5 | Convertible | 3.0L V6 Supercharged | |
| 2011 | Audi | S5 | Coupe | 4.2L V8 | For Vehicles with Production Date After 06/02/08 |
| 2011 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2011 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2013 | Audi | A8 | Quattro L Sedan | 6.3L W12 | |
| 2011 | Audi | S4 | Sedan | 3.0L V6 Supercharged | |
| 2012 | Audi | S5 | Convertible | 3.0L V6 Supercharged | |
| 2012 | Audi | S5 | Coupe | 4.2L V8 | For Vehicles with Production Date After 06/02/08 |
| 2012 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2012 | Audi | S4 | Sedan | 3.0L V6 Supercharged | |
| 2012 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2012 | Audi | A8 | Quattro L Sedan | 6.3L W12 | |
| 2013 | Audi | A8 | Quattro L Sedan | 3.0L V6 Supercharged | |
| 2013 | Audi | A8 | Quattro Sedan | 3.0L V6 Supercharged | |
| 2011 | Audi | S5 | Convertible | 3.0L V6 Supercharged | |
| 2017 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2017 | Audi | A8 | Quattro L Sedan | 3.0L V6 Supercharged | |
| 2017 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2018 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2018 | Audi | A8 | Quattro L Sedan | 3.0L V6 Supercharged | |
| 2018 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2016 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2009 | Audi | A5 | Quattro Coupe | 3.2L V6 | For Vehicles with Production Date After 06/02/08 |
| 2008 | Audi | A5 | Quattro Coupe | 3.2L V6 | For Vehicles with Production Date After 06/02/08 |
| 2009 | Audi | A4 | Quattro Sedan | 3.2L V6 | |
| 2015 | Audi | A8 | Quattro Sedan | 4.0L V8 Turbo | |
| 2015 | Audi | A8 | Quattro L Sedan | 3.0L V6 Diesel Turbo | |
| 2015 | Audi | A8 | Quattro Sedan | 3.0L V6 Supercharged | |
| 2015 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2015 | Audi | A8 | Quattro L Sedan | 6.3L W12 | |
| 2015 | Audi | A8 | Quattro L Sedan | 3.0L V6 Supercharged | |
| 2016 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2015 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2016 | Audi | A8 | Quattro L Sedan | 3.0L V6 Supercharged | |
| 2016 | Audi | A8 | Quattro L Sedan | 3.0L V6 Diesel Turbo | |
| 2016 | Audi | A8 | Quattro L Sedan | 6.3L W12 |