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Old 10-09-2007, 05:24 PM   #1
autoo
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Question brake booster problem ??

Dear All,

I am new here and not very expert as well i need ur help..

i have toyota yaris 2004... issue is.....
it does not happen every time but its happening quite frequently now... when i press my brake pedal to stop the car ... the cars stops instantly just with slight touch (not even pedal pressing is required just slight pressure on pedal stops the car ) which is not normal ...like normal pressing or gradully pressing pressing the brakes..

problem is when i am at low speed like in traffic jam or at signal as soon as my feet touches the brake pedal the car stops like magnet .. like something has forcefully stopped it although in normal condition it should not stop immediately..car should stop gradually !!

My mechanic checked it replaced the brake pads but the issue is still the same he is suggesting me to change the brake boosters as soon as possible.

Please guide me.....

and one thing more i am still feeling some squealing/grinding sounds .. like some thing is rubbing when the front wheels rotates dunoo what it is ?? i read this post over here and my sound issue is almost similar it is produced when car is running not when braking


http://www.car-forums.com/s9/t28382.html

Last edited by autoo : 10-09-2007 at 05:28 PM.
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Old 10-09-2007, 07:01 PM   #2
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Could be a collapsed brake hose. When you are pushing the pedal down, the fluid is being pushed hard, through a small hole, making the car stop abruptly due to all of the pressure being pushed through the system faster and harder than usual. If you can imagine a collapsed hose, no pressure being let through, then all of a sudden all of the fluid is pushed through suddenly, you'll understand, lol. Hope that made sense....
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Old 10-09-2007, 07:32 PM   #3
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Quote:
Originally Posted by Cliffy
Could be a collapsed brake hose. When you are pushing the pedal down, the fluid is being pushed hard, through a small hole, making the car stop abruptly due to all of the pressure being pushed through the system faster and harder than usual. If you can imagine a collapsed hose, no pressure being let through, then all of a sudden all of the fluid is pushed through suddenly, you'll understand, lol. Hope that made sense....
There is a reason that I seldom post on this forum any more. It's not the fact that I've been working 80+ hours a week, although that is a major factor. It's not even the embarrassment of being a member of a forum that has immature threads about soft porn and no moderator is man enough to do something about it. Nosiree. It's "advice" and “technical information" such as this huge, stinking load of crap.

I don't know what cereal box you got your diploma on hydrodynamics from, but tell your mommy to go get her money back. A restricted fluid line will create a high pressure zone UPSTREAM of the restriction and a low pressure zone DOWNSTREAM of the restriction. That is a scientifically based statement, not an opinion based on… What?

What that means to simpletons like you is that in this example the brake will be slower to apply on the affected circuit but will eventually have the same pressure once the restriction is overcome and pressure equalizes. This is how it always happens until you are able to suspend the laws of physics. The most likely effect of a restricted brake line is dragging brakes, not touchy brakes.


I would suggest that instead of spending time in the R&M section “helping” people with things that you haven’t the slightest clue about, go back to doing something that you’re good at… I have no idea what that might be, but there must be something.
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Old 10-09-2007, 09:01 PM   #4
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Quote:
Originally Posted by vwhobo
There is a reason that I seldom post on this forum any more. It's not the fact that I've been working 80+ hours a week, although that is a major factor. It's not even the embarrassment of being a member of a forum that has immature threads about soft porn and no moderator is man enough to do something about it. Nosiree. It's "advice" and “technical information" such as this huge, stinking load of crap.

I don't know what cereal box you got your diploma on hydrodynamics from, but tell your mommy to go get her money back. A restricted fluid line will create a high pressure zone UPSTREAM of the restriction and a low pressure zone DOWNSTREAM of the restriction. That is a scientifically based statement, not an opinion based on… What?

What that means to simpletons like you is that in this example the brake will be slower to apply on the affected circuit but will eventually have the same pressure once the restriction is overcome and pressure equalizes. This is how it always happens until you are able to suspend the laws of physics. The most likely effect of a restricted brake line is dragging brakes, not touchy brakes.


I would suggest that instead of spending time in the R&M section “helping” people with things that you haven’t the slightest clue about, go back to doing something that you’re good at… I have no idea what that might be, but there must be something.
Cliffy, it seems that you suck at life.
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Old 10-09-2007, 09:35 PM   #5
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The reaction disk fell out of place.

Is the booster a rebuild? To resolve the issue, replace the booster with a properly rebuilt or new unit. Alternatively you can rebuild it and put the reaction disk back in place. I will see if I can find you a diagram.

UPDATE: Image attached... Reaction disk #18. The diagram is for a Nissan but all the parts are very similar especially since the Japanese typically share brake components and such between makes (ie. Nabco, Tokico, Fuji Heavy, Sumitomo, etc.). Basically you need to get that little disk back in place. With out it your brakes will be on/off going from pretty much full boost to nothing with alot of free pedal travel.

Hope that helped.

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Last edited by rudypoochris : 10-09-2007 at 09:51 PM.
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Old 10-10-2007, 01:08 PM   #6
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Quote:
Originally Posted by vwhobo
There is a reason that I seldom post on this forum any more. It's not the fact that I've been working 80+ hours a week, although that is a major factor. It's not even the embarrassment of being a member of a forum that has immature threads about soft porn and no moderator is man enough to do something about it. Nosiree. It's "advice" and “technical information" such as this huge, stinking load of crap.

I don't know what cereal box you got your diploma on hydrodynamics from, but tell your mommy to go get her money back. A restricted fluid line will create a high pressure zone UPSTREAM of the restriction and a low pressure zone DOWNSTREAM of the restriction. That is a scientifically based statement, not an opinion based on… What?

What that means to simpletons like you is that in this example the brake will be slower to apply on the affected circuit but will eventually have the same pressure once the restriction is overcome and pressure equalizes. This is how it always happens until you are able to suspend the laws of physics. The most likely effect of a restricted brake line is dragging brakes, not touchy brakes.


I would suggest that instead of spending time in the R&M section “helping” people with things that you haven’t the slightest clue about, go back to doing something that you’re good at… I have no idea what that might be, but there must be something.

I've got to meet VW one of these days!!!!
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Old 10-10-2007, 07:16 PM   #7
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Quote:
Originally Posted by 67Coronet383
Cliffy, it seems that you suck at life.
Meh...More fool him for working 80+ hours a week....I offered a viable and probable cause for his problem, it might just be that hobo misunderstood me....Anyway, all hobo done was get his "followers" talking. I'm now going to go back to work, dealing with ant-social behavior and writing reprts and statements....Just two of the things I happen to be quite good at. I could teach hobo a thing or two about how to conduct an adult conversation and then write it down afterwards, too!
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Old 10-10-2007, 07:37 PM   #8
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Quote:
Originally Posted by Cliffy
Meh...More fool him for working 80+ hours a week....I offered a viable and probable cause for his problem, it might just be that hobo misunderstood me....Anyway, all hobo done was get his "followers" talking. I'm now going to go back to work, dealing with ant-social behavior and writing reprts and statements....Just two of the things I happen to be quite good at. I could teach hobo a thing or two about how to conduct an adult conversation and then write it down afterwards, too!
Actually the "probable cause" you offered was patheticly stupid, but...

All I'm saying is what vwhobo said was funny to me.



P.S if you knew anything at all you'd know first off I wasn't one of his ass-kissing "followers."
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Old 10-10-2007, 07:55 PM   #9
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Quote:
Originally Posted by 67Coronet383
Actually the "probable cause" you offered was patheticly stupid, but...

All I'm saying is what vwhobo said was funny to me.



P.S if you knew anything at all you'd know first off I wasn't one of his ass-kissing "followers."
I wasn't suggesting you were one of his followers...Sorry if it sounded like that.

I'm still waiting for hobo's resollution to the problem though. I mean, he typed four paragraphs but didn't actually offer any form of problem solving. I still don't think that my initial post here was that bad. And I'm the first person to admit defeat if I say something stupid, lol.
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Old 10-10-2007, 10:46 PM   #10
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The issue is what i said 99.95% positive. I want to see if it helped the OP.
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Old 10-11-2007, 03:37 AM   #11
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Quote:
Originally Posted by Cliffy
Meh...More fool him for working 80+ hours a week....I offered a viable and probable cause for his problem, it might just be that hobo misunderstood me....Anyway, all hobo done was get his "followers" talking. I'm now going to go back to work, dealing with ant-social behavior and writing reprts and statements....Just two of the things I happen to be quite good at. I could teach hobo a thing or two about how to conduct an adult conversation and then write it down afterwards, too!

NOT! Cliffy, what you said was not a probable cause nor was it misunderstood. It was a very poor explanation that had no scientific basis at all and hobo called you on it. Just admit you had your head out the window on that one, we all do it from time to time. I do thank you for the humor though, it was fun to read! Hobo's response had me all over the floor. I personally found his response very well written in a fashion that a mature adult would easily understand it and it was precisely articulate as well. I am not sure what you could teach him in that regard, but CHEERS!!
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Old 10-11-2007, 03:58 AM   #12
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Quote:
Originally Posted by cmeseadoin
NOT! Cliffy, what you said was not a probable cause nor was it misunderstood. It was a very poor explanation that had no scientific basis at all and hobo called you on it. Just admit you had your head out the window on that one, we all do it from time to time. I do thank you for the humor though, it was fun to read! Hobo's response had me all over the floor. I personally found his response very well written in a fashion that a mature adult would easily understand it and it was precisely articulate as well. I am not sure what you could teach him in that regard, but CHEERS!!
lol, exactly.
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