Mopar 68245355AD Booster-Power Brake

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Start the engine and depress the pedal. If the pedal goes down slightly, the operation is normal. Then, depress the brake pedal multiple times with the engine running and ensure that there is no change in the pedal reserve distance. To check the airtightness, start the engine and turn it off after one or two minutes. Slowly depress the brake pedal several times and observe if the pedal goes down farther the first time but gradually rises after the second or third depression, indicating an airtight booster. Additionally, 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 reserve travel after holding the pedal for 30 seconds, the booster is airtight.