Explorer 2WD V6-245 4.0L VIN X SFI (1999)
Vacuum Brake Booster Check Valve: Description and Operation
The power brake booster check valve:
^
is located on the front of the power brake booster.
^
is positioned between the power brake booster and the power brake booster hose.
^
closes when the engine is fumed off.
^
in the closed position, traps engine vacuum in the power brake booster.
^
retains vacuum to provide several power assisted brake application with the engine off.
