SOURCE: I NEED A VACUUM HOSE Diagram for 1992 gmc 5.7
Look on the radiator schroud where the hood latch is and look to right.of latch.
SOURCE: losing vacuum
Check your power brake booster. The rubber diaphragm in the booster can dry rot and crack after about 10-12 years. Disconnect the vacuum line from the brake booster and plug it to see if the vacuum increases on your gauge. If it does increase, replace the booster (usually $30-80 depending on model and brand).
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