Wheel End Vacuum Leak Test

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford Pickup, 2004 Ford Excursion, 2004 Ford Cab & Chassis, 2003 Ford Pickup, and 2003 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When front hubs, axle shafts, or hub locks are removed, front wheel end assemblies must be checked for leaks.

Disconnect wheel end vacuum hose. Connect vacuum pump to vacuum fitting on steering knuckle. Apply 15 in. Hg of vacuum to wheel end assembly. Observe vacuum gauge for 30 seconds. Wheel end should not leak more than 1/2 in. Hg in 30 seconds. If leak rate exceeds specification, check and repair as necessary.