Question about GMC Yukon XL
In relation to the brake booster, try looking at the vacuum hose that runs from the inlet manifold to the brake booster. It could have become hard and brittle and split causing a bad air/vacuum leak.
Sometimes in older vehicles the rubber diaphragm inside the brake booster can perish and split allowing excessive air through the booster into the inlet manifold
Posted on Aug 19, 2010
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Posted on Jan 02, 2017
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