Toyota

Have Toyota Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Toyota

On my 2006 Scion Xb just recently the power assist seems to

Customer Question
have gone out. I...
On my 2006 Scion Xb just recently the power assist seems to have gone out. I have no codes or ABS light on or VSC light on. Everything seems normal except that I must press the brake pedal extremely hard to stop. Occasionally the brakes will seem normal but then the power assist fades away and I'm needing to almost stand on the brake pedal. Would this be the vacuum assist module or what?
Submitted: 2 years ago.Category: Toyota
Show More
Show Less
Ask Your Own Toyota Question
Answered in 10 hours by:
10/4/2015
Toyota Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 23,509
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to Justanswer!

You could have a master cylinder issue or fluid contamination can also cause a hard pedal but most likely you either have lost vacuum to the brake booster or the booster itself is the issue. Most likely you have a failed brake booster.

Have you checked for proper vacuum to the booster with the engine running?

Ask Your Own Toyota Question
Customer reply replied 2 years ago
I agreed that the booster was the most likely issue but it isn't. The vacuum is similar to my other scion's around 16 inches of mercury on my cheesy little vacuum gauge. This vehicle is just slightly lower than a working vehicle. I installed a new booster anyway but it made zero results. What is the possibility that the abs motor has gone out? It seems a little far fetched but could it possibly be limiting the pressure to the wheel cylinders? I also did a cursory check on the master cylinder while it was out and all is well, no leaks was easy enough to bleed no problems I could detect.
Toyota Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

If you pump the brake pedal five times, press and hold it firmly and start the engine does the pedal drop?

Ask Your Own Toyota Question
Customer reply replied 2 years ago
No the pedal stays firm. I'm thinking there may be a small vacuum leak, however the engine runs fine. When I put a vacuum gauge on both the bad scion and a good scion the there was only 2 In Hg difference. I didn't think that was significant enough to worry about but I could be wrong. Anyway what are the possibilities of the ABS motor being a problem in this case?
Toyota Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Where did the booster come from?

Ask Your Own Toyota Question
Customer reply replied 2 years ago
The booster is a rebuilt Cardone from 'Auto Zone'.
Toyota Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Is it possible the fluid was contaminated with something such as power steering fluid?

Ask Your Own Toyota Question
Customer reply replied 2 years ago
Apparently my reply to your last question did not go. However, recent developments solved my problem. It was an odd problem to say the least. It was a clog in the vacuum tube that routes the hose to the booster from the air intake. The clog would actually allow some vacuum but as vacuum pressure increased it moved into the constricted part of the metal tube causing vacuum to drop off to an unusable pressure. I discovered this by using the vacuum from another scion xb I have that was working normally. I got an 8' length of hose and connected the booster to the known good vacuum source and the booster 'worked'! Then remeasured the vacuum and found it to be zero on the bad scion. I routed around the metal tube with the hose and the booster started working on the bad scion. I noticed when I routed through the metal tube there was little to no vacuum so I thought it was a crack I hadn't seen. I removed the metal tube expecting to find a crack but I found a bunch of crap that moved to clog the pipe when I applied air to one end. I removed the clog and my ordeal was solved.
Toyota Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

I'm glad you got it fixed!

Ask Your Own Toyota Question
Ask sprinkles08 Your Own Question
sprinkles08
sprinkles08
sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 23,509
23,509 Satisfied Customers
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience

sprinkles08 is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

THANK YOU, THANK YOU, THANK YOU!! I've got my baby back. Tomorrow I will get a tank of high octane, remove the top, go for a long long ride and enjoy my car. THANK YOU!

JugheadUSA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Chris (aka-Moose)

Chris (aka-Moose)

Auto Technician

1,001 satisfied customers

16 years of experience

Marty

Marty

ASE Certified Technician

180 satisfied customers

ASE & Bosch Master Tech. 30 years experience.

Amedee

Amedee

Toyota Technician

1,229 satisfied customers

ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

Anthony

Anthony

ASE Certified Technician

401 satisfied customers

ASE Master Automobile Technician with over 20 years exp. in this field.

Richard

Richard

ASE Certified Technician

9 satisfied customers

Toyota tech. ASE Certified Technician

Skyvisions

Skyvisions

ASE Certified Technician

12,737 satisfied customers

Toyota Master Diagnostic

Genchi Genbutsu

Genchi Genbutsu

Toyota Master Technician

3,761 satisfied customers

Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine

< Previous | Next >

Related Toyota Questions
Brake lights stay on.. I'm trying to figure out where to get
Brake lights stay on.. I'm trying to figure out where to get the plastic bumper thing as I've found it all over the floor after I pulled out the switch to the brake … read more
Todd M
Todd M
Owner
ASE Certification
1,486 satisfied customers
New brakes and rotors all around, good pedal until engine
new brakes and rotors all around, good pedal until engine start up, pedal goes down almost to floor, very spongy feel, power bled system , no air . … read more
Mechanic01
Mechanic01
1,700 satisfied customers
Can't start car, brake pedal engaged. Tried jumping because
Can't start car, brake pedal engaged. Tried jumping because thought low battery but still not working.… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,403 satisfied customers
Brake problem. Toyota highlander 2007. It was at a repair
Brake problem JA: What is the make/model/year of your car? Customer: toyota highlander 2007 JA: Are you fixing your Highlander yourself? What have you tried so far? Customer: It was at a repair shop J… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,403 satisfied customers
The sensitivity of the brake pedal on my 2013 Toyota Sequoia
the sensitivity of the brake pedal on my 2013 Toyota Sequoia seems to be off. Used to be where the vehicle would remain motionless when I softly rest my foot on the brake pedal. Now, I need to press i… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
12,737 satisfied customers
The toyota red brake light turned on and then turned off
hi the toyota red brake light turned on and then turned off after a couple of minutes … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Brake system is not functioning appropriately. 2003 camry
brake system is not functioning appropriately JA: What is the model/year of your Toyota? Customer: 2003 camry toyota JA: Are you fixing your Camry yourself? What have you tried so far? Customer: no wi… read more
Gunvir Singh
Gunvir Singh
1,817 satisfied customers
2009 toyota venza, below freezing the brake peddle will not
2009 toyota venza, below freezing the brake peddle will not mash to let motor start. This is after car sits all night. once weather warms above freezing the barkes will depress and car will start … read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
Check engine and brake warning lights go on and off. Stays
check engine and brake warning lights go on and off … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
The tail lights are not working but the brake lights and
the tail lights are not working but the brake lights and license plate lights and the turn signals all work...? … read more
Todd M
Todd M
Owner
ASE Certification
1,486 satisfied customers
I need to bleed the brakes but I've gotten conflicting
I need to bleed the brakes but I've gotten conflicting information about the proper bleed sequence for a 2003 toyota avalon. … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
2007 Toyota Avalon brake lights and center brake light do
2007 Toyota Avalon brake lights and center brake light do not work. Changed 15 Amp fuse and checked the 7.5… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,403 satisfied customers
The brake lights stay on unless you wiggle the brake pedal.
The brake lights stay on unless you wiggle the brake pedal. Have a 03 mr2 … read more
Ron Z.
Ron Z.
Vocational, Technical or Trade Scho
2 satisfied customers
Check engine light, brake light and hazard symbol are all
check engine light, brake light and hazard symbol are all on. … read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
12,737 satisfied customers
ABS brake RED light on but brake works, brake system warning
brake system warning lights too after reset code it works fine for 100 KMs then its appears again … read more
Ricardo Hohl
Ricardo Hohl
Auto Motive Instructor
Automotive tech
4,287 satisfied customers
Brake lights won't turn on. Replaced Brake Light switch.
Brake lights won't turn on. Replaced Brake Light switch. That did not correct the problem. Cannot find brake light fuse on my 2004 corolla le in the fuse box inside the engine. There is no fuse box be… read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
Engine won't start. All the electrical comes on but brake
Engine won't start. All the electrical comes on but brake won't depress and start engine. It happened yesterday but started after some time. Same problem this morning … read more
sprinkles08
sprinkles08
ASE Certified Technician
23,509 satisfied customers
My engine brake on a 2011 club car keeps grabbing especially
my engine brake on a 2011 club car keeps grabbing especially first run in the morning of on wet days. I have had it in to technician several times, the last time he adjusted it to moderate but changes… read more
Mechanic01
Mechanic01
1,700 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x