Question about 2001 Toyota Sienna

1 Answer

Brakes don't operate when pedal is pressed. I get a hissing sound and the pedal gets hard. Engine speeds up when I do this.

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 819 Answers

Your brake booster had developed a vacuum leak internally, likely the diaphragm. this is a sealed unit, so the entire part must be replaced. this is the large round canister located behind the master cylinder (very difficult to see and access on your van). good luck!

Posted on Oct 04, 2010

Testimonial: "Thanks for your quick response. I was asking for a friend who cannot afford any extra expenses right now. I will buy the part and have another insta"

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

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

Why would my brakes hiss when I step on them and cause the engine to rev up when I do this? It also makes the vehicle very hard to stop.


It sounds like your brake booster is leaking. The air hissing is the air going into the leak. This extra air goes into the engine and causes the engine to rev up. The booster is what makes it easy to push the brake, (when it is working correctly) which is why the pedal is hard to push.

May 31, 2012 | Chevrolet Blazer Cars & Trucks

1 Answer

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

1 Answer

Brake pedal hard 2 press,can hear a hissin sound.


the hissing sound is most likely the vacuum leaking past the seal in the brake booster & that is why the brake pedal is hard because you don't have any power assistance, the brake booster will have to be replaced.......hope this helps.....cheers.

Aug 31, 2011 | Honda Accord Cars & Trucks

1 Answer

2003 trail blaizer abs press brake pedal its hard sounds like vacuum leak under dash


your brakes are what is called power brakes if your vechile did not have power brakes it would be hard to push the brake pedal down the power brake booster is ran off vacume from the motor if your booster is bad it will give a hissing sound or simalar there not hard to replace but you have no tools or experince dooing repairs like this its best left to a shop.

Aug 28, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

I have a 2001 mazda tribute and i can't get it to engage into gear out of park. I turn my car on and off, pump my brakes several times and it would finally come out of park. Now it's getting worse. My...


the hissing sounds are probably the brake booster seals from you pumping hard on the pedal,
if your shifter is located on the floor the shift inter lock is just a solenoid that gets its power from the stop light switch,

Dec 23, 2009 | Mazda Tribute Cars & Trucks

1 Answer

Brakes problem


jcakey: My name is Roger and I will answer your question for you. From what you describe the problem sounds like a bad vacum brake booster. A simple way to check is to do the following. With the engine off. Press on the brake pedal 4 or 5 times. This will deplete all vacum in the booster. Next start the engine while holding your foot on the brake pedal. The pedal should drop a couple of inches. If the pedal does not drop. The problem is the brake booster. When the booster is bad you will hear a hissing sound inside of the truck when you apply the brakes..
If the master cylinder is faulty you will wave mushy brake to no brakes.Your ABS and brake failure lights will be on. Should you need further help please just ask. I will be glad to help you. Please rate this answer as this is how we know your answer was useful.Thank You for using Fix Ya. Roger

Sep 09, 2009 | GMC Sierra 1500 Cars & Trucks

1 Answer

When u press on the brakes on my expedition, i hear air escaping.


If it is a constant hiss with your foot on the pedal, you have a bad brake booster. If you hear a hiss, and nothing else while holding the pedal, it is the air escaping from the booster boot, and should not pose a problem.

Jun 11, 2009 | 2003 Ford Expedition

1 Answer

97 blazer


Power Brake Booster is bad and will need to be replaced. The diaphram leaks when you push on the pedal which robs the engine of vacuum and causes it to stall and the brakes are hard because with a bad booster you get no power assist.

Aug 21, 2008 | 1997 Chevrolet Blazer

Not finding what you are looking for?
2001 Toyota Sienna Logo

264 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts

yadayada
yadayada

Level 3 Expert

79123 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8836 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...