Overview
The Crown Automotive J8136618 is a brake master cylinder for early Jeeps. It fits the 1959–1960 and 1966 CJ3, the 1959–1966 CJ5 and CJ6, the 1966 CJ5A and CJ6A, and several Willys CJ-2, CJ-3, CJ-5 and CJ-6 years. Its mounting holes are not threaded, and the bolt-hole centers are 3-1/2 apart.
It is a direct-fit replacement.
Key features
- Replacement brake master cylinder, direct fit
- Both mounting holes are not threaded
- Bolt-hole center to bolt-hole center is 3-1/2
- Covers CJ3, CJ5, CJ6 and Willys models
Checking the hydraulic side
A master cylinder works with the brake lines, the fluid reservoir and the pedal, so a new cylinder affects the whole system. Before fitting, inspect the lines for kinks, corrosion and seepage at the fittings. Old fluid that has absorbed moisture can also affect braking, so drain and replace it along with the cylinder.
Unthreaded mounting holes are held with through hardware, so the mounting bolts should be snug and evenly tightened. Check that the pushrod lines up with the brake pedal linkage before bleeding. Pedal feel after installation is a good check that the cylinder seats and the system is free of air.
- Inspect brake lines before reinstalling
- Use fresh brake fluid throughout the system
- Confirm pedal travel before driving
Specifications
| Brand | Crown Automotive |
|---|---|
| Part number | J8136618 |
| Part type | Brake master cylinder |
| Type | Replacement |
| Fit style | Direct fit |
| Mounting holes | Not threaded |
| Mounting hole spacing | 3-1/2, center to center |
Vehicle fitment
It fits the 1959–1960 and 1966 Jeep CJ3, the 1959–1966 CJ5, the 1966 CJ5A, the 1959–1966 CJ6 and the 1966 CJ6A, plus the 1948–1949 Willys CJ-2, the 1949–1958 CJ-3, the 1955–1958 CJ-5 and the 1956–1958 CJ-6. Make sure your year, model and trim match before you order.
Later CJ5 and CJ6 years from 1967 on, and the CJ7, are not covered.
Installation notes
Because the mounting holes are not threaded, the cylinder is held with through hardware; check that the bolt spacing of 3-1/2 matches your original master cylinder.
