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TRW PML172 Brake Master Cylinder
| Brand | TRW PML172 |
|---|---|
| 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 Cap Included | No |
| Master Cylinder Material | Aluminum |
| Push Rod Included | No |
| Reservoir Included | No |
| Bleeder Hoses Included | No |
| Sensor Included | No |
| Mounting Hole Diameter | 22 |
| Port Quantity | 2 |
| Mounting Bracket Included | No |
| Bore Type | Straight |
| Secondary Outlet Thread Size | M12 - 1.0 |
| 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 |
Aluminum construction. Lightweight master cylinder housing for dependable brake hydraulics.
Straight bore design. Supports smooth hydraulic response in a compact brake master cylinder.
Seals included. Gasket or seal comes with the unit for a cleaner installation.
Cross-references 4D0611021 and 4D0611021A for the same application. See all 2.
TRW PML172 Brake Master Cylinder
The TRW PML172 brake master cylinder is a direct-fit hydraulic replacement for select Audi and Volkswagen models with a 25.4 mm straight bore and dual M12 x 1.0 outlet threads. Built from aluminum with two mounting holes, it includes a dust boot and gasket/seal for service-ready installation on the listed applications.
Key Features
- Brake master cylinder for brake hydraulic service
- 25.4 mm primary bore diameter with straight bore type
- Aluminum master cylinder body
- Two port design with primary and secondary outlet thread size M12 x 1.0
- Dust boot included
- Gasket or seal included
- Two mounting holes with 22 mm mounting hole diameter
- No reservoir, cap, push rod, brake booster, or mounting hardware included
Fitment Details
- Fits 2001-2003 Audi A8 Quattro, N/A, without electronic stability control.
- Fits 2001-2003 Audi S8, N/A, without electronic stability control.
- Fits 2002 Audi S4, N/A, without electronic stability control.
- Fits 2000-2001 Audi A4, N/A.
- Fits 2000-2001 Audi A4 Quattro, N/A.
- Fits 2000-2001 Audi A6, N/A.
- Fits 2000-2001 Audi A6 Quattro, N/A.
- Fits 2000-2001 Audi S4, N/A.
- Fits 2001 Volkswagen Passat, N/A, without electronic stability control.
- Fits 2000 Volkswagen Passat, N/A.
- Fits 1999 Audi A4 Quattro, N/A, from chassis/VIN 8D-X-200 001.
- Fits 1997-1999 Audi A8, N/A.
- Fits 1997-1999 Audi A8 Quattro, N/A.
- Fits 1999 Volkswagen Passat, N/A, from chassis/VIN 3B-X-491 581.
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 ports
- Pedal travel issues caused by worn hydraulic seals
- Brake system performance concerns on Audi A4, A6, A8, S4, S8, and Volkswagen Passat applications
Installation Notes
Verify the vehicle’s brake system configuration before installation, especially electronic stability control coverage and VIN breakpoints listed in the fitment data. Confirm the 25.4 mm bore, M12 x 1.0 outlet threads, and two-hole mounting pattern match the original unit on your Audi or Volkswagen. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.
Quality Assurance
TRW brake hydraulics are built for OE-style service replacement, with aluminum construction and included sealing components to support proper hydraulic function on the specified vehicles. The TRW PML172 is identified for use on 1997-2003 Audi and 2000-2001 Volkswagen Passat applications listed above.
| Year | Make | Model | Submodel | Liters | Cylinders | Fuel Type | Notes |
|---|---|---|---|---|---|---|---|
| 2003 | Audi | A8 Quattro | L | 4.2L | V8 | — | Without electronic stability control |
| 2003 | Audi | S8 | Base | — | — | — | Without electronic stability control |
| 2002 | Audi | A8 Quattro | Base | 4.2L | V8 | — | Without electronic stability control |
| 2002 | Audi | S4 | Avant | — | — | — | Without electronic stability control |
| 2002 | Audi | S8 | Base | — | — | — | Without electronic stability control |
| 2001 | Audi | A4 | Base | 1.8L | L4 | — | — |
| 2001 | Audi | A4 Quattro | Avant | 1.8L | L4 | — | — |
| 2001 | Audi | A6 | Base | — | — | — | — |
| 2001 | Audi | A6 Quattro | Base | 2.8L | V6 | — | — |
| 2001 | Audi | A8 Quattro | L | 4.2L | V8 | — | Without electronic stability control |
| 2001 | Audi | S4 | Base | 2.7L | V6 | — | — |
| 2001 | Audi | S8 | Base | — | — | — | Without electronic stability control |
| 2001 | Volkswagen | Passat | GLX 4 Motion | — | — | — | Without electronic stability control |
| 2000 | Audi | A4 | Base | 2.8L | V6 | — | — |
| 2000 | Audi | A4 Quattro | Base | 1.8L | L4 | — | — |
| 2000 | Audi | A6 | Base | — | — | — | — |
| 2000 | Audi | A6 Quattro | Base | 2.8L | V6 | — | — |
| 2000 | Audi | S4 | Base | 2.7L | V6 | — | — |
| 2000 | Volkswagen | Passat | GLS | 1.8L | L4 | — | — |
| 1999 | Audi | A4 Quattro | Base | — | — | GAS | From Chassis/VIN 8D-X-200 001 |
| 1999 | Audi | A8 | Base | — | — | — | — |
| 1999 | Audi | A8 Quattro | Base | — | — | — | — |
| 1999 | Volkswagen | Passat | GLS | 2.8L | V6 | — | From Chassis/VIN 3B-X-491 581 |
| 1998 | Audi | A8 | Base | — | — | — | — |
| 1998 | Audi | A8 Quattro | Base | — | — | — | — |
| 1997 | Audi | A8 | Base | — | — | — | — |
| 1997 | Audi | A8 Quattro | Base | — | — | — | — |
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