Question about 1996 Mercury Cougar XR7

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Booster brake failure

No power brake and a little air hissing inside the cabin

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You have a vacuum line disconnected under the dash. Remove the lower cover & trace the largest vacuum hose back to the firewall...

Posted on May 01, 2014

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Posted on Jan 02, 2017

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2 Answers

Have02 buick cent,starts right up,I hear air hissing while drivin doesn't have the power to go up hill,it will not go over 45 on hwy,bought,controlvalve,EGRvalve,TPsensor,and in tank cleaner.help?plz!


Check for vacuum leaks. Hissing usually indicates a vacuum leak. Check around the intake manifold and intake runners, pcv valve, vacuum lines, brake booster and anything else (air conditioner controls if you have automatic climate control) that runs on vacuum. A hiss that is louder inside the car is usually caused by either a brake booster leak (closer to driver side) or the air container controls (closet to the center console). Good luck.

Mar 17, 2017 | Buick Cars & Trucks

1 Answer

Air hissing noise from brake pedal 2002 ml 320 mercedes


Mercedes MLs 98-05 have an issue with Brake Booster seal. I had numerous MLs with that issue. As long as you have good functioning brakes and your only concern is the hissing from under the pedal, then you have no issue with the actual booster.

If you go with any unsuspecting mechanic, they will recommend you to replace Booster and it will set you back about $1000. The solution in replacing a simple seal that goes bad and starts leaking air back into the cabin under the dash, thus causing the hiss..

Jan 29, 2013 | Cars & Trucks

1 Answer

Hi renault scenic 2l auto 2002. another common problem.


hissing noise is a leaking diaphram inside power brake booster.you have to replace the power brake booster.

Sep 18, 2012 | Renault Megane Cars & Trucks

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1999 Buick Century Custom _ Brake Problem My 99 Century has little to no assist and it makes an air hissing sound when depressing the brake pedal. I think that this means that I have a faulty brake...


nope you have to replace them.when brake booster diaphram leaks you cant plug them.i have bought one at salvage yard in good shape.until i got a new one.get your brake booster from inside salvage yard where they stock them inside out the weather.dont take any brake booster off old outside cars been in all kinds bad weather. there vacuum diaphram probably dried up will leak also.

Jun 11, 2011 | 1999 Buick Century

1 Answer

I can hear a hissing noise coming from the brake pedal on my 2002 Ford Escape. Its been there for a little while. Sometimes the brakes doesn't work properly, it feels a little spongy sometimes. But usually...


It sounds like the rubber diaphragm in the brake booster has developed a leak producing the hissing / sucking noise. The only option is to replace the booster as a complete assembly as they need specialist tools to repair. If the booster fails completely you will still have brakes but the pedal will be very hard and it will take a lot of muscle power to stop vehicle. Best to have booster replced soon before you experience situation described above.

Nov 07, 2010 | 2002 Ford Escape

1 Answer

How do I remove the brake power booster from a '97 Thunderbird? I'm getting a hissing sound and can feel air under the dash when I press on the brake pedal. All of the bolts, clips, master cylinder, etc...


Remove the rod going to the brake pedal,then remove the master cylinder,you may can unbolt the master,from the booster,and move it out of the way without removing the brake lines,they will give quit a bit.Now go back inside and remove the four nuts on the studs holding the brake booster in,they may be a little hard to reach,and of course remove the check valve with the hose on it,going to the booster under the hood,If this was at all helpful,please rate,thank you.

Jul 12, 2010 | Ford Thunderbird Cars & Trucks

3 Answers

Brake hisses under the dash when i step on the brake pedal


this is caused by a defective leaking vacuum (that is the hiss) power brake booster diaphragm, replace the power brake booster.Use the link below for general instructions on replacing your booster, it is a diff car but the same type of part is on your car.
http://neptune.spacebears.com/cars/stories/booster.html

May 20, 2009 | 1995 Pontiac Grand Am

2 Answers

19984 F150 Hissing Brakes


This noise is the seal for the power brake booster leaking, you will have to replace the vacuum booster to fix it.

Nov 12, 2008 | 1984 Ford F 150

1 Answer

Power booster


replace the power brake booster. there is a rubber boot inside the booster that has a hole , and when you depress the brake it opens the hole.

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