Master cylinder
Worked great! I had to return a couple things from my order that I didn’t end up needing and their customer service was very prompt and helpful. Will continue to do business as I was a first time customer.
Serving customers since 1960 — over 250,000 satisfied customers
Pay in 4 interest-free installments of $40.00 with

Add your vehicle to check the fit — every fit is guaranteed.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
Refresh the braking system on your classic with this replacement master cylinder. Whether you're replacing a worn unit or tackling a full restoration, this essential component delivers the hydraulic pressure your brakes depend on. This Master Cylinder fits 1939–1940 Buick Special 40; 1940–1942, 1946–1949 Buick Super Series 50 and Roadmaster Series 70; 1939–1942 Buick Century Series 60; 1946–1949 Buick Special Series 40 and other models.
Add your vehicle to check the fit — every fit is guaranteed.
| Notes | ||||||
|---|---|---|---|---|---|---|
| 1939 | Buick | Century Series 60 | - | - | - | - |
| 1939 | Buick | Special 40 | - | - | - | - |
| 1939 | Buick | Special 40 | Base | - | - | - |
| 1940 | Buick | Century Series 60 | - | - | - | - |
| 1940 | Buick | Century Series 60 | - | - | - | - |
| 1940 | Buick | Roadmaster Series 70 | - | - | - | - |
| 1940 | Buick | Special 40 | - | - | - | - |
| 1940 | Buick | Special 40 | Base | - | - | - |
| 1940 | Buick | Super Series 50 | - | - | - | - |
| 1941 | Buick | Century Series 60 | - | - | - | - |
| 1941 | Buick | Limited Series 90 | - | - | - | - |
| 1941 | Buick | Roadmaster Series 70 | - | - | - | - |
| 1941 | Buick | Roadmaster Series 70 | - | - | - | - |
| 1941 | Buick | Special Series 40-A | - | - | - | - |
| 1941 | Buick | Special Series 40-A | - | - | - | - |
| 1941 | Buick | Special Series 40-A | - | - | - | - |
| 1941 | Buick | Special Series 40-A | Base | - | - | - |
| 1941 | Buick | Special Series 40-B | - | - | - | - |
| 1941 | Buick | Special Series 40-B | - | - | - | - |
| 1941 | Buick | Special Series 40-B | Base | - | - | - |
| 1941 | Buick | Super Series 50 | - | - | - | - |
| 1942 | Buick | Century Series 60 | - | - | - | - |
| 1942 | Buick | Limited Series 90 | - | - | - | - |
| 1942 | Buick | Roadmaster Series 70 | - | - | - | - |
| 1942 | Buick | Special Series 40-A | - | - | - | - |
| 1942 | Buick | Special Series 40-B | - | - | - | - |
| 1942 | Buick | Super Series 50 | - | - | - | - |
| 1942 | Buick | Super Series 50 | Base | 4.1L 4065CC 248CID L8 | - | - |
| 1946 | Buick | Roadmaster Series 70 | - | - | - | - |
| 1946 | Buick | Special Series 40 | - | - | - | - |
| 1946 | Buick | Special Series 40 | Base | 4.1L 4065CC 248CID L8 | - | - |
| 1946 | Buick | Super Series 50 | - | - | - | - |
| 1946 | Buick | Super Series 50 | Base | 4.1L 4065CC 248CID L8 | - | - |
| 1947 | Buick | Roadmaster Series 70 | - | - | - | - |
| 1947 | Buick | Special Series 40 | - | - | - | - |
| 1947 | Buick | Special Series 40 | Base | 4.1L 4065CC 248CID L8 | - | - |
| 1947 | Buick | Super Series 50 | - | - | - | - |
| 1947 | Buick | Super Series 50 | Base | 4.1L 4065CC 248CID L8 | - | - |
| 1948 | Buick | Roadmaster Series 70 | - | - | - | - |
| 1948 | Buick | Special Series 40 | - | - | - | - |
| 1948 | Buick | Special Series 40 | Base | 4.1L 4065CC 248CID L8 | - | - |
| 1948 | Buick | Super Series 50 | - | - | - | - |
| 1948 | Buick | Super Series 50 | Base | 4.1L 4065CC 248CID L8 | - | - |
| 1949 | Buick | Roadmaster Series 70 | - | - | - | - |
| 1949 | Buick | Special Series 40 | - | - | - | - |
| 1949 | Buick | Special Series 40 | Base | 4.1L 4065CC 248CID L8 | - | - |
| 1949 | Buick | Super Series 50 | - | - | - | - |
| 1949 | Buick | Super Series 50 | Base | 4.1L 4065CC 248CID L8 | - | - |
Worked great! I had to return a couple things from my order that I didn’t end up needing and their customer service was very prompt and helpful. Will continue to do business as I was a first time customer.
Great
Part arrived timely and was an exact fit.
Part arrived timely and was an exact fit.