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Power Brake Unit Function Check (Simple Method)

NOTE:

Replace power brake unit assembly as necessary.

Step 1

With the engine stopped, depress the pedal several times.
With the pedal depressed, start the engine.
- If the pedal moves down slightly, immediately after the engine starts, the unit is operating.
- If a problem is found, inspect for damage on the check valve or vacuum hose, and examine the installation. Repair as necessary, and inspect it again.

Step 2

Start the engine.
Stop the engine after idling for 1 or 2 minutes.
Depress the pedal with the usual force.
- If the first pedal stroke is long and becomes shorter with subsequent strokes, the unit is operating.
- If a problem is found, inspect for damage on the check valve or vacuum hose, and examine the installation. Repair as necessary, and inspect it again.

Step 3

Start the engine.
Depress the pedal with the usual force.
Stop the engine with the pedal held depressed.
Hold the pedal down for about 30 seconds.
- If the pedal height does not change, the unit is operating.
- If a problem is found, inspect for damage on the check valve or vacuum hose, and examine the installation. Repair as necessary, and inspect it again.