6 L4-2.5L (2010)
Vacuum Brake Booster: Testing and Inspection
POWER BRAKE UNIT INSPECTION
NOTE:
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The following inspection methods are simple inspection methods to judge the function of the power brake unit.
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If there is any malfunction in the power brake unit, replace the power brake unit as a single component.
Without Using SST
Operation inspection
1. Depress the pedal several times with the engine stopped.
2. With the pedal depressed, start the engine.
3. If the pedal moves down slightly immediately after engine start, the unit is normal.
Vacuum function inspection
1. Start the engine.
2. Stop the engine after driving the vehicle for 1-2 min.
3. Depress the pedal with normal force.
4. If the first pedal stroke is long and becomes shorter with subsequent strokes, the unit is normal.
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If a malfunction is found, inspect for damage to or improper installation of the check valve and vacuum hose. After repairing, inspect again.
Vacuum loss function inspection
1. Start the engine.
2. Depress the pedal with normal force.
3. Stop the engine under this condition.
4. Hold the pedal depressed for approx. 30 s.
5. If the pedal height does not change during this time, the unit is normal.
When using SST
NOTE:
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When performing the inspection using the SST, inspect the brake pipe on the left or right front wheel.
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The following procedure and figures show the inspection for the brake pipe on the left front wheel.
Preparation before inspection
1. Disconnect the brake pipe flare nut.
2. Disconnect the brake hose (LF).
3. Remove the bracket.
