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Here you can see the rod exiting the boost unit. With both vacuum and hydraulic boosters, the input rod from the brake pedal enters the booster and is intercepted and routed through the boost mechanism. However, in both cases, should the boost system fail, the pedal input rod will still contact the input rod at the master cylinder to operate the master correctly. This fully manual fail-safe mode allows the brakes to continue to operate unboosted should the boost system fail. View Related Article
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