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To find a vacuum leak from the manifold to the brake booster, start by visually inspecting the vacuum hoses and connections for cracks, wear, or disconnections. You can use a smoke machine to introduce smoke into the system, which will help identify any leaks. Additionally, listen for hissing sounds near the brake booster and use a spray of soapy water around the connections; bubbles will indicate a leak. If necessary, you can also use a vacuum gauge to check for low vacuum levels, which may signal a leak in the system.

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3mo ago

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