Posted by Owen Aaland on March 07, 2011 at 20:06:03 from (207.13.114.181):
In Reply to: vacume booster posted by Old Roy on March 07, 2011 at 18:14:56:
The whooshing sound might well be normal.
The booster works by having a diaphragm attached to the brake rod in the middle of the vacuum chamber with vacuum on each side. When you step on the pedal you allow air to enter the pedal side of the booster. Since the atmospheric pressure is greater than the vacuum the diaphragm assists in pushing the rod into the master cylinder to give you the assist with braking. A lot of trucks had the air inlet for the vacuum booster under or behind the drivers seat so hearing the noise would not be unusual.
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