A Gasoline Line Is Connected to a Pressure Gauge

The valve should allow flow from the brake. Also make sure the hose is properly connected not loose.

30 0 30 Psi Glycerine Filled Pressure Gauge

Replace the hose if necessary.

. Then check the one-way valve that connects the vacuum hose to the brake booster for cracks looseness or damage some vehicle models use an in-line check valve between the brake booster and intake manifold.

Example Pressure Youtube

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