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18 comments
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Join Date: Sep 2012
Posts: 37

Will a Bad Brake Booster Cause a Vehicle to Stall?

09/01/2012 1:00 PM

Well I'm pretty sure I need a new brake booster. I did a lot of research on the internet and found that my car has all the symptoms of a bad break booster. I hear constant air coming from the pedal when I brake and its hard to brake. My car idles fine when in park but when I put it in another gear, the idle jumps up and down and the car wants to stall (when it gets low enough the car jerks forward) and sometimes it does stall but it starts up easily. When its in park I turn the wheel side to side and the RPM does the same thing but doesn't stall. The head lights and the dash lights dim when the car is about to stall. It has gotten worse over the last couple of weeks. I thought it was a spark plug at first before it got this bad and now I realize its something worse. The engine is a refurbished one that just got put in a couple of months ago. It has a new battery. I checked the throttle body and its super clean. I had the engine running and was under the hood and didn't hear air coming out so I don't think there is a vacuum leak. I was wondering if my brake booster can be the cause of my car stalling?? or could I need a new IAC valve?

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Pathfinder Tags: Brake Booster GMC Jimmy Stalling
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#1

Re: Will a bad brake booster cause a vehicle to stall??

09/01/2012 1:09 PM

Yes, that may be the problem.

GET IT FIXED!!!

Driving without adequate brakes will not endear you to anyone, least of all your insurance company, or the person you run over when you can't stop on time.

Take it to the man!!!

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#2

Re: Will a bad brake booster cause a vehicle to stall??

09/01/2012 1:43 PM

Guessing without the appropriate testing feedback, is pretty much an exercise in futility....

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#3
In reply to #2

Re: Will a bad brake booster cause a vehicle to stall??

09/01/2012 1:45 PM

The vehicle won't idle and it won't stop. What more do you need to know before it gets towed to the shop and repaired?

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#4
In reply to #3

Re: Will a bad brake booster cause a vehicle to stall??

09/01/2012 2:17 PM

Maybe this person can't afford to do that, and is forced to rely on friends and personal ability...Maybe this vehicle isn't driven on public roads in traffic....The fact that the vehicle hasn't been towed into the shop for repairs, and the poster is asking for advice on this forum, suggests that there may be extenuating circumstances....But without testing feedback from the troubleshooting process there is little to be gained, especially from someone who thinks that listening for a vacuum leak is a definitive test....

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#5
In reply to #4

Re: Will a bad brake booster cause a vehicle to stall??

09/01/2012 2:47 PM

Don't justify driving an unsafe vehicle, just to prove your point.

The OP obviously doesn't have the ability to troubleshoot the problem.

Changing oil and air cleaners is one thing.

Many lives might depend on this vehicle stopping properly in an emergency.

"Maybe this vehicle isn't driven on public roads in traffic" is an irresponsible statement!

Go to the naughty step!

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#6
In reply to #5

Re: Will a bad brake booster cause a vehicle to stall??

09/01/2012 3:06 PM
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#7

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/02/2012 3:13 AM

well as a beginning you could try disconnecting the vacuum line to the booster & plug it making sure it does not leak & tying to see if it still runs poorly if that stops it from stalling then it is possibly the booster but DO NOT drive the vehicle while you have this set up as brakes will not have vacuum assistance. after that get back to us & tell us what has happened

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#8

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/02/2012 4:45 AM

As Brettj has mentioned, it might be a broken or damaged hose or brake servo or simply a hose has fallen off.....

It might be a cheap fix or a less cheap fix, but you do need to get the car towed to a professional mechanic and not play around here......it is simply too dangerous for all concerned......

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#9

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/02/2012 8:24 AM

Pull the vacuum hose to the break booster. With the vehicle parked push on the brakes and if the engine runs properly. Purchase a rebuilt or junk yard booster.

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#10

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/02/2012 10:40 AM

Obviously Samantha is not experienced with mechanics thats why she asked us for our opinion but a few simple suggestions & basic diagnosis can give her a rough idea where the problem is so she can tell if the mechanic she goes to see is ripping her off or is being honest & I figure a few basic tests can help diagnose the problem if not no harm no loss as long as the instructions are clear with safety warnings

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#11

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/02/2012 11:11 AM

Samantha two things if you are looking for a vacuum leak you won't hear it unless it a major 1 you will want to look for hose barbs the thing hoses attach to & hoses that aren't attached to something & also look for splits in hoses all along & right at the barbs.

The other thing you haven't just started using an ethanol blend fuel for the first time? I just went to some ones place they thought it would save money & used it for the first time & their vehicle just ran really rough & wouldn't idle stalled all the time was un drivable they thought it was a major problem & new premium fuel solved their problem.

The difficulty braking is the only symptom that isn't the same that is why I suggested pulling the booster hose off & plugging the end to see if it fixed the problem at idle if it did fix it, the diaphragm is sucking air & as you state you can often hear it inside the car when the pedal is pressed.

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#12
In reply to #11

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/02/2012 11:21 AM

Well i took off the hose and plugged it up and it did fix the idle problem. Im going to buy a brake booster now and install it. No worries i know how to do it. Thanks everyone for your help!

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#13
In reply to #12

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/02/2012 11:29 AM

Excellent!

Good luck!

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#14
In reply to #12

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/02/2012 7:52 PM

well we were all wrong you do have mechanical ability & just needed help diagnosing the problem. Good luck to you & hope you get it done without any problems

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#15
In reply to #14

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/02/2012 8:56 PM

Yeah i have a little knowledge of a cars engine and what not. The brake light switch gave me a lot of trouble. At the end of it, i couldnt install the booster after all the work because the bolts to get the booster off was behind too many things and its impossible for me to get to. So i have to have a mechanic go through all that. Sucks because i went through everything but oh well. thanks for everything though!

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#16
In reply to #15

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/02/2012 9:06 PM

Welcome to the club.

When the brake booster was installed at the factory, there was no interior, instrument panel, dash or any of that stuff that you can't snake through to get to the nuts on the INSIDE of the vehicle. No motor, either.

This is one of those times when you'd like to be squeezing the privates of the guy who designed it, when you ask him, "Why did you do it that way"?

You did your legwork and found the solution. That deserves a GA!

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#17
In reply to #16

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/03/2012 7:07 AM

Oh i really want to do that! Lol and thanks. I need a new stop light swith now lol im scared to put a new one on seeing how the old one was so weird.

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#18
In reply to #17

Re: Will a Bad Brake Booster Cause a Vehicle to Stall?

09/03/2012 6:56 PM

Sounds like you better make sure your horn works.

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Users who posted comments:

Andy Germany (1); brettj1au (4); lyn (5); rhandwor (1); samantha0440 (3); SHOCKISCAN (1); SolarEagle (3)

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