Tracker 4WD L4-1.6L VIN 6 (1998)
Vacuum Brake Booster: Description and Operation
Booster Assembly
The booster assembly is located along the bulkhead in the left side of the engine compartment, between the brake pedal and the master cylinder. It is
designed to take advantage of the vacuum produced by the engine. The applied force created when the brake pedal is pressed is mechanically increased
with the assistance of engine vacuum.
If the booster assembly becomes inoperable, brake operation will not be lost. The force of the brake pedal being pressed will still be transferred through
the control valve, booster piston, piston rod, and onto the master cylinder. The brake system will still operate but the pedal will be harder to press.
The booster assembly in this vehicle is not serviceable and must be replaced as a unit.
Check Valve and Hose
The check valve allows vacuum to flow from the booster assembly to the engine intake manifold. During periods of low or no engine vacuum, the check
valve closes and prevents loss of vacuum reserve in the booster assembly. The check valve is inside the vacuum hose. The check valve is serviced as part
of the vacuum hose.
