Question about 2003 GMC Yukon
Check for a faulty booster check valve. it is on vacuum hose to booster. you should only be able to blow on only one side, if you can blow through both sides then it is bad. the check valve holds the vacuum in booster. if bad you will lose vacuum.
The check valve keeps the vacuum in the booster from leaking back into the intake when engine vacuum drops because of high loads or when the engine dies.
The symptoms would be no power boost when you turn the engine off or when the engine dies. Step on the brake with the engine running and note pedal position. Turn off engine and step again and the position should be the same. If the pedal is hard and higher then the check valve or booster is bad. have a good day!!
Posted on Nov 10, 2010
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Posted on Jan 02, 2017
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