Question about 1991 Buick Century

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When applying the brakes I hear a loud noise like air coming through the lines do I need a vacuum booster

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If it takes time to stop the car and the pedal is to the floor when braking, YES replace the booster

Posted on Jun 05, 2010

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1 Answer

Hear air when I hit the brake on my 2007 scion tc I hit a median 2 weeks ago


Brake booster uses vacuum to operate, so when applying brakes you hear a vacuum leak. Could be bad booster of some other vacuum line that you hear when booster draws vacuum.

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more than likely a failed booster
disconnect the vacuum line to the booster ,blank it off and see if there is an air noise when you use the brake pedal.

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IT is probably a vacuum leak in the brake booster. With the pedal going to the floor There is either no brake fluid or you will have to bleed the system. Replace the booster and bleed the brakes starting at the longest line first

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You have a leaking power brake vacuum (this is what you hear) operated power booster. Go to this link to read the procedure of removing and pacing the power brake vacuum booster

Jul 12, 2012 | 1996 Jeep Grand Cherokee

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Brake pedal has alot of back pressure and car moves in gear.Have to press real hard to stop.How to check abs pump if has one where or brake booster or master cylinder?Don't know how to trouble shoot or...


The air seeping is a dead giveaway. Your power brakes are now manual brakes, but stiffer. The diaphram in the brake booster has torn and the hissing noise is the engine vacuum escaping (you hear it louder when you depress the pedal right?). Replace the booster and you will be fine. The brake lights probably don't work because you can't push the pedal down far enought to release the switch. Please rate. Thanks.

Sep 03, 2011 | 1995 Mercury Cougar

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Its a constent hissing from my brakes in my Mazda 2001 tribute. The noise does stop When i press on the brakes but as soon as i let off them the hissing continues. Ive read it could be the brake booster. ...


It is the booster, but it might not be abnormal.

Vacuum from the engine is supplied to the booster, and vented if the brakes are not being applied.

When you step on the pedal, the movement of the pedal blocks the vents, allowing the vacuum to build up. That vacuum then pulls on a diaphragm, assisting you in applying the brakes.

Most people can’t hear that venting, some can.

You should, of course, have it checked out, but it sounds as if this might be normal operation.

The booster is bolted to the firewall, and then the brake master cylinder is bolted to the forward side of the booster.

To replace it you disconnect the brake pedal, remove the master cylinder, take the vacuum line off the booster, unbolt it from the firewall.

Install the new booster by reversing these steps.

But I don't think you need one, from what you say.

Aug 11, 2010 | Mazda Tribute Cars & Trucks

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When i step on my brakes u hear a loud air noise and they are hard to stop


You need to replace the pads or u have a hose or line busted which immediatly needs to be replaced.Hope this helps and Thank You for asking.

Jul 19, 2010 | 1994 GMC Jimmy

1 Answer

When the brakes are either applied or released there is sometimes a hissing(air)noise from the brakes.front brake pads have recently been changed but the noise was there before they were changed


the noise you can hear may be coming from the brake system booster.. This is a vacuum system and the hissing noise may be from a leak into the vacuum chamber in the booster. My advice is to take the vehicle into a reputable mechanic and have it checked professionally..

Oct 31, 2009 | 1998 Volvo V70

1 Answer

My car idles at 3 and the brake is stiff


Sounds like you have a major vacume leak, Chk. line going to break booster. Do you hear a loud hissing or whiseling noise either comming from under the hood or under the dash especily when you apply the break? If under dash could be bad break booster, if under hood still could be booster or a break in the vacume line from engine to booster.

Sep 07, 2009 | 1995 Pontiac Grand Prix

2 Answers

1998 caviler when brakes are applied engine revs up


Hello;
Yoou most likely have a vacuum leak in the line from the booster to the intake. It could be a bad booster or check valve as well.
Thanks;
Rich
RPM Northwest

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