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If it is a brand new master cylinder, it needs to be bench bled. If it was removed from the vehicle, it needs to be bench bled. If the brake lines were disconnected from it and there was a lot of fluid loss, it needs to be bench bled. If the reservoir was empty or very low and sucked air when the brakes were applied, it needs to be bench bled. If in doubt, bench bleed it. It's one of your vehicle's most important safety features, don't risk your safety, or the safety of others, for the sake of saving a few minutes of time or doing a little less work.

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Q: How do I know if I have to bench bleed my master cylinder or not?
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