Overview
The Crown Automotive power brake booster check valve grommet, part number 4723640, is a rubber grommet for the check valve on a power brake booster. It is part of Crown Automotive’s replacement lineup for Jeep vehicles, and no specific Jeep years, models or trims are named for it.
Confirm the grommet matches your booster’s check valve before installing it.
Key features
- Rubber construction
- Designed for the power brake booster check valve
- Crown Automotive replacement part for Jeep vehicles
- Part number 4723640
Booster check valve basics
The check valve on a power brake booster keeps vacuum in the booster when the engine is off or running low, so the pedal still provides assist for a few applications. A worn grommet can let air leak past the valve, which shows up as a hard pedal, a hissing noise at the booster, or rough idle. Because the grommet is rubber, it can soften or crack over time, especially around engine bay heat.
When replacing a grommet, inspect the booster port and the vacuum hose for cracks at the same time. Use the correct size and seating for your booster, and avoid lubricants that can swell rubber. After installation, test the pedal with the engine running and again after shutting it off to confirm the vacuum holds.
- Check the vacuum hose for cracks or brittleness
- Listen for hissing near the booster
- Test pedal assist after the engine is shut off
Specifications
| Brand | Crown Automotive |
|---|---|
| Part number | 4723640 |
| UPC | 848399006926 |
| Material | Rubber |
| Application | Power brake booster check valve |
Vehicle fitment
No year, model or trim is named for this grommet. Crown’s replacement parts are offered for Jeep vehicles in general, so confirm the match for your Jeep’s power brake booster before ordering.
Confirm your vehicle’s year, model and trim before ordering.
What’s included
Only the rubber grommet comes with it. Check the package contents against your booster before installing.
