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TRW PML420 Brake Master Cylinder
| Brand | TRW PML420 |
|---|---|
| Reservoir Material | None |
| Dust Boot Included | Yes |
| Mounting Hardware Included | No |
| Gasket Or Seal Included | Yes |
| Mounting Hole Quantity | 2 |
| Master Cylinder Bore Diameter | 25.4 |
| Bleeder Screw Included | No |
| Piston Quantity | 2 |
| Brake Booster Included | No |
| Master Cylinder Material | Aluminum |
| Push Rod Included | No |
| Reservoir Included | No |
| Bleeder Hoses Included | No |
| Sensor Included | No |
| Port Quantity | 2 |
| Mounting Bracket Included | No |
| Bore Type | Straight |
| Primary Outlet Thread Size | M12 - 1.0 |
| Brake Pressure Switch Required | No |
| Brake Pressure Switch(s) Included | No |
| Primary Bore Diameter | 25.4 |
| Fits | Audi and Volkswagen · 27 vehicles |
OE direct replacement. Brake master cylinder with a straight-bore aluminum design.
Seals included. Gasket or seal is included for a tighter, cleaner installation.
Dual-piston design. Built with two pistons for consistent hydraulic response.
Cross-references 8E0611021 for the same application. See all 1.
Brake Master Cylinder for Audi and Volkswagen
TRW PML420 is a brake master cylinder built for select Audi A4, A4 Quattro, A6, A6 Quattro, S6, and Volkswagen Passat applications. It features a 25.4 mm straight bore, aluminum construction, and two-port hydraulic routing for the listed fitments.
Key Features
- Brake master cylinder for brake hydraulics service
- 25.4 mm primary bore diameter with straight bore type
- Aluminum master cylinder body
- Two piston design
- Two mounting holes and two outlet ports
- Dust boot included
- Gasket or seal included
- Primary outlet thread size: M12 - 1.0
- No reservoir included
- No brake booster, push rod, sensor, or bleeder hoses included
Detailed Description
TRW PML420 is a direct-fit brake master cylinder for specific Audi and Volkswagen brake systems that use the listed bore and port configuration. This part number is commonly referenced for OE-style replacement needs on 2002-2009 Audi A4, A4 Quattro, A6, A6 Quattro, S6, and 2002-2005 Volkswagen Passat applications, including vehicles originally supplied by Girling, Lucas, TRW, or EXC. ATE exclusions as noted in the fitment data. This part cross-references 8E0611021 for the same application.
What This Part Helps Address
- Low or inconsistent brake pedal response
- Internal hydraulic leakage in the master cylinder
- Brake fluid loss at the cylinder body or outlet connections
- Pedal travel issues related to worn master cylinder seals
- Brake system performance concerns tied to the original hydraulic unit
Installation Notes and Tips
- Verify the vehicle’s original supplier and brake system details before ordering, especially where ATE exclusions are listed.
- Confirm the 25.4 mm bore, M12 - 1.0 primary outlet thread, and two-port layout match the original unit.
- Transfer or source any components not included with the master cylinder, including the reservoir, brake booster, push rod, and mounting hardware.
- Bleed the brake system thoroughly after installation to remove air from the hydraulic circuit.
- Inspect all brake lines, seals, and connections for wear before returning the vehicle to service.
Quality Assurance
TRW is a recognized brake component manufacturer, and PML420 is built to match the listed OE-style specifications for the covered Audi and Volkswagen applications. Use the fitment notes to confirm the correct vehicle match before installation.
| Year | Make | Model | Submodel | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2009 | Audi | A4 | Cabriolet | 2.0L | L4 | N/A | Original Part Vendor: Girling |
| 2009 | Audi | A4 Quattro | Cabriolet | 2.0L | L4 | N/A | Original Part Vendor: Girling |
| 2008 | Audi | A4 | Cabriolet | 2.0L | L4 | N/A | Original Part Vendor: Girling |
| 2008 | Audi | A4 Quattro | Avant | 3.2L | V6 | N/A | Original Part Vendor: Girling |
| 2007 | Audi | A4 | Base | 3.2L | V6 | N/A | Original Part Vendor: Girling |
| 2007 | Audi | A4 Quattro | Avant | 3.2L | V6 | N/A | Original Part Vendor: Girling |
| 2006 | Audi | A4 | Base | 3.2L | V6 | N/A | Vendor: EXC. ATE |
| 2006 | Audi | A4 Quattro | Avant | 3.2L | V6 | N/A | Vendor: EXC. ATE |
| 2005 | Audi | A4 | Base | 2.0L | L4 | N/A | Vendor: EXC. ATE |
| 2005 | Audi | A4 Quattro | Base | 3.0L | V6 | N/A | Vendor: EXC. ATE |
| 2005 | Volkswagen | Passat | GLX 4 Motion | — | — | N/A | Vendor: EXC. ATE |
| 2004 | Audi | A4 | Base | 3.0L | V6 | N/A | Vendor: EXC. ATE |
| 2004 | Audi | A4 Quattro | Avant | 1.8L | L4 | N/A | Vendor: EXC. ATE |
| 2004 | Audi | A6 | Base | — | — | N/A | Vendor: EXC. ATE |
| 2004 | Audi | A6 Quattro | Base | 4.2L | V8 | N/A | Vendor: EXC. ATE |
| 2004 | Volkswagen | Passat | GLX | 2.8L | V6 | N/A | Original Part Vendor: Lucas or TRW |
| 2003 | Audi | A4 | Cabriolet | 1.8L | L4 | N/A | Vendor: EXC. ATE |
| 2003 | Audi | A4 Quattro | Avant | 1.8L | L4 | N/A | — |
| 2003 | Audi | A6 Quattro | Base | 2.7L | V6 | N/A | Vendor: EXC. ATE |
| 2003 | Audi | S6 | Avant | — | — | N/A | Vendor: EXC. ATE |
| 2003 | Volkswagen | Passat | GLS | 1.8L | L4 | N/A | Vendor: EXC. ATE |
| 2002 | Audi | A4 | Base | 3.0L | V6 | N/A | — |
| 2002 | Audi | A4 Quattro | Avant | 1.8L | L4 | N/A | — |
| 2002 | Audi | A6 | Base | 3.0L | V6 | N/A | Vendor: EXC. ATE |
| 2002 | Audi | A6 Quattro | Base | 3.0L | V6 | N/A | Vendor: EXC. ATE |
| 2002 | Audi | S6 | Avant | — | — | N/A | Vendor: EXC. ATE |
| 2002 | Volkswagen | Passat | W8 | — | — | N/A | — |
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