suspicious vacuum leak with AC on and applying brakes while coming to stop.
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suspicious vacuum leak with AC on and applying brakes while coming to stop.
1992 Buick Lesabre with 3.8L.
Driving down the road with the air conditioning on max high. As I come to a stop, i hear this air leak that sounds like the air brakes on a big truck. I dont hear it as loudly on normal ac while braking, but its there.
Driving down the road with the air conditioning on max high. As I come to a stop, i hear this air leak that sounds like the air brakes on a big truck. I dont hear it as loudly on normal ac while braking, but its there.
CF Beginner
Joined: Jul 2010
Posts: 10
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From: Huntsville, AL
Does it hiss only when A/C is on and braking? I ask because a hissing noise when braking can indicate a dying brake booster. But if that's the case, it would happen whenever you brake, not just with A/C on.
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