Leak Test
- Air Tightness Check:
- Start the engine and stop it after 1 or 2 minutes. Depress the brake pedal several times slowly.
- If the pedal goes down farthest the first time, but gradually rises after the second or third time, the booster is air tight.
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- Depress the brake pedal while the engine is running, and stop the engine with the pedal depressed.
- If there is no change in the pedal reverse travel after holding the pedal for 30 seconds, the booster is air tight.