hissing in cab
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Freshman User
Joined: Feb 2004
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From: south georgia
hissing in cab
shoot first ask questions later!
ihave an 87 f-150 4.9 4x4. np 435 tranny.when sitting in the cab with engine idling, ican hear a hissing noise.i think its the brake boostersucking air.when you press the brake pedal hard it stops and the engine rpms drop a little.sitting on an incline it will not roll back unless i take my foot and pull the brake pedal toward me.(the hissing stops also when i do this).is my booster bad?or is it something else?
