Question about 1997 Chevrolet Suburban
Air pressure sound may come from a leaky vacuum hose or bad check valve at the booster or master cylinder.
But, I think that it's normal to hear a soft hissing sound when depressing the brake pedal which comes from hydraulic fluid going through the passage ways.
Is the pedal hard?
Posted on Sep 30, 2010
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Posted on Jan 02, 2017
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