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DormanPart #: M39670
Dorman M39670 Brake Master Cylinder
⚙️ 9 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$137.51Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship
Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Audi, 100, 100 Quattro, 5000 Quattro, and Quattro
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? Click here for all Brake Master Cylinder options
Dorman M39670 Brake Master Cylinder
| Brand | Dorman |
| Part Number | M39670 |
| Mounting Hardware Included | No |
| Master Cylinder Bore Diameter | 0.938 |
| Master Cylinder Material | Aluminum |
| Reservoir Included | No |
| Secondary Outlet Thread Diameter | 10 |
| Sensor Included | No |
| Number of Outlets | 4 |
| Package Contents | Master cylinder |
| Rearward Outlet Size | M10 x 1.0 |
| Thread Pitch | 1.0 |
This part fits 9 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1991 | Audi | 100 Quattro | N/A | Exc. Heavy Duty Brakes; Bore: 15/16 In.; w/Girling Brake System |
| 1990 | Audi | 100 Quattro | N/A | Exc. Heavy Duty Brakes; Bore: 15/16 In.; w/Girling Brake System |
| 1989 | Audi | 100 | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1988 | Audi | 5000 Quattro | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1987 | Audi | 5000 Quattro | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1986 | Audi | 5000 Quattro | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1985 | Audi | Quattro | N/A | |
| 1984 | Audi | Quattro | N/A | |
| 1983 | Audi | Quattro | N/A | From VIN 85-D-900 358 |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
072-829511-20421204213-2042130.3310218M377443611021783-96102F107743M-02102M52042M900583MC107743MC390097
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.