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Hissing noise on ford focus that stops when brake pedal is pressed?

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Brake booster check valve

Posted on Jun 19, 2015

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  • Ford Master
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Problem in the brake booster
replace /repair it asap.

Posted on Jun 19, 2015

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6 Suggested Answers

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Posted on Jan 02, 2017

studio500
  • 36 Answers

SOURCE: brake hissing noise

Sounds like it could well be the brake servo unit.

Posted on Apr 17, 2009

  • 195 Answers

SOURCE: 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

Posted on Jun 04, 2009

greg_margo
  • 1959 Answers

SOURCE: hissing noise pedal goes to the floor

Sounds like a broken brake line. The broken line has emptied your master cylinder leaving you no fluid and that's why the pedal goes to the floor. Very dangerour to drive in this condition, be careful.

Posted on Jul 29, 2009

SOURCE: my brakes are making a hissing noise when i let

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.

Posted on Nov 19, 2009

  • 677 Answers

SOURCE: 2002 escape hissing from inside under/by brake

You have done the brake booster.Its a mechanic shop job.If you jab the brake a few times in a short sequence,the motor should slow down just a fraction.It might.Hope this helps

Posted on Feb 03, 2010

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1 Answer

Can this inspection and removal of the Clutch actuator components be done without removal of the Bellmouth.Would the unusual hissing sound on depressing the Clutch Pedal indicate an airlocked system?


there is no air in a hydraulic system or if there is , the clutch will not disengage
if you have any sound when depressing the clutch pedal, it is most likely from the throw out bearing running dry when pressure is applied to the pressure plate fingers
so it amounts to this
if you press on the clutch pedal and you can readily engage first gear or reverse and you have steady operation when you take your foot of the pedal , the clutch system is working as it should
that means that any noise you get when pressing on the pedal is when the throw out bearing is placed under load and as there is no other part that is moving, that is the logical area
one point here --if it is an air noise and of that you are sure , when people press on the clutch pedal, to stop vehicle movement they also have the foot resting or pressing on the brake and a hissing noise here can be from a vacuum leak at the brake pedal from the brake booster
easy to check before pulling a box that doesn't have a problem

Sep 17, 2016 | 2002 Land Rover Freelander

1 Answer

My brake pedal will not budge, and a hissing noise present when running


The stop lights won't go out until the pedal is depressed, as there is a switch which is activated by the pedal.

A hard brake pedal is probably caused by a defective servo. The hissing noise is probably an air leak in the servo.

Switch the engine on, open the bonnet (the hood..) and see if you can locate the hissing - that'll probably be in the brake servo area.

If you don't know what a brake servo looks like here is a generic image:



26071617-5gult0ot5kkhyupfos0rfps2-1-0.jpeg

Jan 27, 2016 | 1989 GMC Sierra

1 Answer

Hissing noise when i press the brakes sounds like air,but when i take my foot off the noise stops


sounds like its the power brake booster that is causing this noise. you don`t say what year make model of car. ford at one time had this problem but it did not affect braking. on other cars it was the vacume shut off switch for the cruise control at the brake pedal which indicated a bad switch and needs replacing.

Aug 21, 2014 | Cars & Trucks

1 Answer

1996 Buick Park Avenue Ultra making a hissing noise when I press Brake Pedal. Have to Press super hard to stop or slow down.


Sounds like a possible air pocket in the braking system. Do you know how the bleed the brakes? They may need to be bled. Also, if you've added brake fluid recently, and didn't put the cap back on, it could create a suction. Another note is to check the cap to the brake fluid reservoir. It's rare, but, it could be bad.

Jul 10, 2013 | Cars & Trucks

1 Answer

Brake Problem


yes but up to a point
the brake pedal should move about 1" to take up the pedal free play and then be applied smoothly as you press further
the harder you press the more solid stopping action you will get
that way you can feel the brakes working so that you can adjust the braking action for stopping
there should be no hissing noise that occurs when the brakes are being applied
you say hydro booster which is hydraulic booster but a hissing noise will come from an air leak in a vacuum brake booster which indicates that it needs repalcing

Apr 16, 2017 | 2001 Dodge Durango

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

1 Answer

2001 ford escape makes a hissing and high pitched squealing sound when the brake pedal is released?


You need to have the brakes inspected. This noise is the brake pad wear warning tab hitting the brake rotor.;

Jun 27, 2012 | Cars & Trucks

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

My 2003 ford expedition just started a hissing noise near the brake pedal that stops when I press on the brake pedal


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

Sep 03, 2010 | 2003 Ford Expedition

1 Answer

Hissing noise when releasing brake pedal


Sounds like your brake booster but can't be sure until I know what kind of truck or car you have....

Jun 27, 2009 | 2003 Ford Expedition

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