Question about 2002 Toyota Sequoia

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There is a hissing noise on my 2002 Sequoia that stops when the brake pedal is hit. Do you have any idea what it is?

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Indicates a bad vacuum leak in the brake booster
take it to an accredited brake specialist shop for a proper diagnosis
best fix is a new booster unit

Posted on Dec 28, 2016

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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 brakes


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

Oct 08, 2013 | Dodge Neon 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

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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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

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My car will start but I cannot move it into drive. When I push on the brakes to transition from Park to Drive the brakes make a hissing noise...


The hissing noise could be the power brake booster leaking vacuum. The inability to shift out of park is likely to be a bad SHIFTER INTERLOCK SWITCH attached to the brake pedal under the dash.

Dec 30, 2010 | 2002 Pontiac Aztek

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

2002 escape hissing from inside under/by brake pedal. when pressing on brake hissing stops. Is this the booster? Help


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

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this noise is caused by a defective power brake vacuum booster, (big round thing behind the master cylinder) the diaphragm is leaking vacuum.

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2 Answers

Brake hissing noise


Sounds like it could well be the brake servo unit.

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