Overview
The Crown Automotive J0803640 is a front passenger side wheel cylinder, part number CROJ0803640, for early Jeep CJ models. It fits the 1960 and 1966 CJ3, the 1960–1971 CJ5 and CJ6, and the 1966–1968 CJ5A and CJ6A.
All fitments are Base trim. It mounts at the front right position and is a direct fit.
Key features
- Front passenger side (front right) position
- Fits CJ3, CJ5, CJ5A, CJ6 and CJ6A models
- All listed entries are Base trim
- Part number CROJ0803640
Before you install
A wheel cylinder converts brake fluid pressure into shoe movement at the wheel. On an older CJ, the front cylinder works alongside the drum brake shoes and the adjuster, so its condition affects how evenly the brakes engage on both sides of the vehicle. Because the cylinder is a hydraulic part, a small leak can lower fluid level and let air into the line, which makes the pedal feel soft.
Before fitting, inspect the brake drum, shoes and backing plate for fluid soaking. Check that the piston moves freely and that the boot is intact. Fluid on the linings means the shoes usually need replacing as well. Bleed the system after the new cylinder is connected, and road test the vehicle at low speed before relying on the brakes.
- Compare the new cylinder with the old one before removing the line
- Keep brake fluid off painted surfaces
- Replace the rubber hose if it is cracked or swollen
Specifications
| Brand | Crown Automotive |
|---|---|
| Part number | CROJ0803640 |
| Position | Front right (passenger side) |
Vehicle fitment
The manufacturer fitment list shows these vehicles:
- 1960 and 1966 Jeep CJ3: Base
- 1960–1971 Jeep CJ5: Base
- 1966–1968 Jeep CJ5A: Base
- 1960–1971 Jeep CJ6: Base
- 1966–1968 Jeep CJ6A: Base
Model years outside these ranges and other Jeep models are not on this list. Confirm your vehicle’s year, model and trim before ordering.
