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Power Brake Unit Function Check (Simple Method)

WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Replace power brake unit component if necessary.

Step 1

With the engine stopped, depress the pedal a few times.
With the pedal depressed, start the engine.
- If the pedal moves down slightly, immediately after engine starts, the unit is operating.
- If not, inspect for damage on the check valve or vacuum hose, and examine the installation. Repair if necessary, and inspect it again.

Step 2

Start the engine.
Stop the engine after it has run for 1 or 2 minutes.
Depress the pedal with usual force.
- If the first pedal stroke is long and becomes shorter with subsequent strokes, the unit is operating.
- If not, inspect for damage on the check valve or vacuum hose, and examine the installation. Repair if necessary, and inspect it again.

Step 3

Start the engine.
Depress the pedal with 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 not, inspect for damage on the check valve or vacuum hose, and examine the installation. Repair if necessary, and inspect it again.