Excursion 4WD V10-6.8L VIN S (2000)
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 replaced separately; (replace the grommet when replacing the check valve).
-
is positioned between the power brake booster and the power brake booster hose.
-
closes when the engine is turned off.
-
in the closed position, traps engine vacuum in the power brake booster
-
retains vacuum to provide several power assisted brake applications with the engine off.