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"Yes, I was having the exact same problem as you were. Called a friend who a mechanic. He explained to me that the only thing probably happening was the lack of, or too much "air" in the vacuum braking system. He instructed me to turn off the vehicle, pump the brakes until it won't pump any more (about 3 or 4 pumps), and that should eliminate the air, or gaps in the vacuum system. It actually worked. Once I did that, it didn't matter what I did acceleration wise, or how long the truck sat, the noise was gone!!! That seemed to have worked for me. He said only if it is consistent will it actually be the brake power booster, meaning every time you accelerate from braking, not just once after sitting. If it was occassionally, or after sitting, it meant that the there was a lack of, or too much air in the vacuum braking system. He said it commonly happens with temperature/pressure changes, outside, similar to what can happen with tire pressure. He said that the people who got theirs replaced thinking it was the problem, the technician would have "pumped" or bled the brakes anyway eliminating the problem after an unnecessary part change."
Sounds like some good info.
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2008 Expedition Eddie Bauer 4x2
1978 F250 Lariat 4x2
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