Run the engine for one or two minutes, and then stop it. If the pedal depresses fully the first time but gradually becomes higher when depressed succeeding times, the booster is operating properly, if the pedal height remains unchanged, the booster is defective.

With the engine stopped, step on the brake pedal several times.

Then step on the brake pedal and start the engine. If the pedal moves downward slightly, the booster is in good condition. If there is no change, the booster is defective.

With the engine running, step on the brake pedal and then stop the engine.

Hold the pedal depressed for 30 seconds. If the pedal height does not change, the booster is in good condition, if the pedal rises, the booster is defective.

If the above three tests are okay, the booster performance can be determined as good.

Even if one of the above three tests is not okay, check the check valve, vacuum hose and booster for defect.

Disconnect the brake booster vacuum hose (check valve built in) (A) at the booster (B).

Start the engine and let it idle. There should be vacuum available. If no vacuum is available, the check valve is not working properly. Replace the brake booster vacuum hose and check valve and retest.

Remove the master cylinder.

Disconnect the vacuum hose (A) from the brake booster (B).

Remove the snap pin (A) and pin (B).

Remove the four booster mounting nuts (C).

Remove the brake booster (A) from the engine compartment.

Adjust push rod length of the booster, and then install the seal on the booster assembly.

Insert the booster and tighten the nut (C).

Connect the booster push rod and brake pedal with a pin (B) and install a snap pin (A) to the pin (B).

Install the master cylinder.

Connect the vacuum hose to the brake booster.

After filling the brake reservoir with brake fluid, bleed the system.

Check for fluid leakage.

Check and adjust the brake pedal for proper operation.