you mean you hear air in the cab down by the pedal. If thats the case your power steering assist is leaking. Its the big black unit behind the brake master cylinder. It may set a check engine light at times for lean condition.

Anonymous

326 Answers
Posted on Sep 03, 2010

SOURCE: My 2003 ford expedition just started a hissing

most likely have a bad diaphram in the brake booster that hisssing sound is vacuum leaking under hood there will be hose going to brake booster unhook hose and pinch off hose start car does hissing sound disappear if so bad booster

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Transmission diagram ef fairmont

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I need a diagram for a 94 EF fairmont vaccum brake system,i have a hissing noise when the brake is pressed

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Transmission diagram ef fairmont

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I need a diagram for a 94 EF fairmont vaccum brake system,i have a hissing noise when the brake is pressed

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Brake pedal hard to press has a hissing sound

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