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RUN.10W
Joined: Mon Sep 20, 2010 7:17 am Posts: 211 Location: sydney
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 Posted: Wed Feb 02, 2011 6:34 am |
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Hi again
Sorry to be of a pain but im at my wits end with this car. I have had pedal pressure problems for a while now and slowly been changing stuff, today i put a new brake master cylinder in it had my fingers crossed this would sort it though it hasn't. Now when i take the vacuum hose off the booster and put my finger over the end of the hose the pedal goes good and i have great feeling brakes, though once i take my finger off the hose the motor stalls as it should. Once i put the vacuum hose back onto the brake booster the pedal goes soft again and when i pump the pedal to get a little bit of brake the engine stalls. Also when i disconnect the vacuum hose it always has pressure in it and lets it all out when i take it off the booster? Its a 1996 coil model sierra if it helps with a bias valve in the rear if that helps.
any help will be great guys.
thank you
Last edited by RUN.10W on Wed Feb 02, 2011 9:04 am, edited 1 time in total.
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Joe
I live here!
Joined: Sat Jul 04, 2009 11:30 pm Posts: 49041 Location: Rockingham W.A
Vehicle: JB74
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Posted: Wed Feb 02, 2011 6:38 am |
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I seen the tittle to this and i thought it was gunna be a thread about Hotshit or Monkey 
Sorry Mr 10W i can't help with your question 
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Joe likes boobs ( . )( . ) ( ° )( ° )
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RUN.10W
Joined: Mon Sep 20, 2010 7:17 am Posts: 211 Location: sydney
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Posted: Wed Feb 02, 2011 6:39 am |
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 sorry for the disappointment Mr Joe
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96 coily, lifted, locked,geared, 33's.
DRV31T
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Hotshot993
Joined: Wed Dec 01, 2010 9:46 pm Posts: 1270 Location: Brisbane
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Posted: Wed Feb 02, 2011 7:15 am |
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Haha same I thought here we go, a thread bagging me out. And yeah sorry no help either.
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atari4x4
az supporter
Joined: Mon Dec 11, 2006 10:30 pm Posts: 34842 Location: East Radelayed
Vehicle: SV420+SV620 Vitara's
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Posted: Wed Feb 02, 2011 7:27 am |
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Grimbo will tell you what is annoying....
When someone else comes across this thread titled "annoying" 18 months later when looking for answers about brake problems & a soft pedal.
Hotquaterpounderwithnopicklesandsmallfireshaventyougotsomeburgerstoflip993
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You're just hating because you don't understand
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RUN.10W
Joined: Mon Sep 20, 2010 7:17 am Posts: 211 Location: sydney
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Posted: Wed Feb 02, 2011 7:41 am |
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Wonder if by any chance I might get some help or advice ha ha
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96 coily, lifted, locked,geared, 33's.
DRV31T
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Kermy87
Joined: Mon Sep 13, 2010 10:13 am Posts: 348 Location: Hervey bay QLD
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Posted: Wed Feb 02, 2011 7:47 am |
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Sounds like a sota similar problem I had with one of mine, well still is a problem,,, I just bypassed it ,,,sounds like the power booster has hole in it somewhere, and the engine is stalling because it's getting way too much air through air leak in the booster
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Sik as drover, 32" mongrels, 4age 20v, 2" sus, 2"
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Built4thrashing
Joined: Wed May 21, 2008 11:30 pm Posts: 4972 Location: Dandenong .Vic
Vehicle: 1999 GV. Locked and Lifted
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Posted: Wed Feb 02, 2011 7:48 am |
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try reposting with a short description of your problem in the thread title
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B4T
Built by me to be driven like a rental
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Hotshot993
Joined: Wed Dec 01, 2010 9:46 pm Posts: 1270 Location: Brisbane
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Posted: Wed Feb 02, 2011 7:52 am |
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atari4x4 wrote: Grimbo will tell you what is annoying....
When someone else comes across this thread titled "annoying" 18 months later when looking for answers about brake problems & a soft pedal.
Hotquaterpounderwithnopicklesandsmallfireshaventyougotsomeburgerstoflip993
What are you on about here atari?
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Teracis
Joined: Sat Dec 11, 2010 10:03 pm Posts: 2261 Location: Gold Coast
Vehicle: Daisy
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Posted: Wed Feb 02, 2011 7:57 am |
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Just edit your original post to change the title.
Also, I've not done much with brake lines e.t.c but can you isolate each section and see if it clears the problem? i.e. remove rear line and cap, if it fixes it your problem is to do with the rears. e.t.c
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steak_knife
az supporter
Joined: Fri May 22, 2009 11:30 pm Posts: 21335 Location: Smart Ass Island
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Posted: Wed Feb 02, 2011 8:12 am |
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Booster is meant to make the peddle soft, that's what it does, It adds no breaking "power" at all..
Adjust your rear brake's....
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I used to be indecisive,
now I'm not so sure.....
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atari4x4
az supporter
Joined: Mon Dec 11, 2006 10:30 pm Posts: 34842 Location: East Radelayed
Vehicle: SV420+SV620 Vitara's
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Posted: Wed Feb 02, 2011 8:18 am |
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Hotshot993 wrote: atari4x4 wrote: Grimbo will tell you what is annoying....
When someone else comes across this thread titled "annoying" 18 months later when looking for answers about brake problems & a soft pedal.
Hotquaterpounderwithnopicklesandsmallfireshaventyougotsomeburgerstoflip993 What are you on about here atari? sorry Hotspellchecker993... it's not often that i write the words fries & i got 2 letters the wrong way around, maybe you should spend more time proof reading your own posts 
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You're just hating because you don't understand
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Hotshot993
Joined: Wed Dec 01, 2010 9:46 pm Posts: 1270 Location: Brisbane
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Posted: Wed Feb 02, 2011 8:40 am |
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Haha I was just being a smart arse, didn't really care.
I had to take advantage of the opportunity as it doesn't come up very often:)
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RUN.10W
Joined: Mon Sep 20, 2010 7:17 am Posts: 211 Location: sydney
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Posted: Wed Feb 02, 2011 9:03 am |
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Rear brakes have been capped off, same problem,
Steak knife rear brakes have been adjusted.
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96 coily, lifted, locked,geared, 33's.
DRV31T
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shep
Joined: Thu Mar 29, 2007 11:30 pm Posts: 14498 Location: Here there everywhere
Vehicle: A manly awesome man jimny
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Posted: Wed Feb 02, 2011 9:11 am |
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are the front brake flex lines swelling?
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JEEPJEEPJEEPJEEPJEEPJEEPJEEPJEEPJEEP
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RUN.10W
Joined: Mon Sep 20, 2010 7:17 am Posts: 211 Location: sydney
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Posted: Wed Feb 02, 2011 9:28 am |
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No mate haven't seen nor felt any swelling in the front brake lines either.
_________________
96 coily, lifted, locked,geared, 33's.
DRV31T
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steak_knife
az supporter
Joined: Fri May 22, 2009 11:30 pm Posts: 21335 Location: Smart Ass Island
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Posted: Wed Feb 02, 2011 10:18 am |
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It could be the booster, but doesn't really sound like it, normally if the booster goes & you lose peddle it will make a hissing noise on application of the brake's..
can you get you hand's on a booster to try??
_________________
I used to be indecisive,
now I'm not so sure.....
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RUN.10W
Joined: Mon Sep 20, 2010 7:17 am Posts: 211 Location: sydney
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Posted: Wed Feb 02, 2011 10:20 am |
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Yea I may be able to get a booster from a mates car to try, thanks mate
_________________
96 coily, lifted, locked,geared, 33's.
DRV31T
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steak_knife
az supporter
Joined: Fri May 22, 2009 11:30 pm Posts: 21335 Location: Smart Ass Island
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Posted: Wed Feb 02, 2011 10:20 am |
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Are coily's plastic booster's??
_________________
I used to be indecisive,
now I'm not so sure.....
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bagnkat
az supporter
Joined: Sun Aug 16, 2009 11:30 pm Posts: 346 Location: Port Stephens.
Vehicle: SJ80
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Posted: Wed Feb 02, 2011 6:05 pm |
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steak_knife wrote: Are coily's plastic booster's??
No.
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bagnkat
az supporter
Joined: Sun Aug 16, 2009 11:30 pm Posts: 346 Location: Port Stephens.
Vehicle: SJ80
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Posted: Wed Feb 02, 2011 6:12 pm |
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RUN.10W wrote: Hi again
Sorry to be of a pain but im at my wits end with this car. I have had pedal pressure problems for a while now and slowly been changing stuff, today i put a new brake master cylinder in it had my fingers crossed this would sort it though it hasn't. Now when i take the vacuum hose off the booster and put my finger over the end of the hose the pedal goes good and i have great feeling brakes, though once i take my finger off the hose the motor stalls as it should. Once i put the vacuum hose back onto the brake booster the pedal goes soft again and when i pump the pedal to get a little bit of brake the engine stalls. Also when i disconnect the vacuum hose it always has pressure in it and lets it all out when i take it off the booster?
Its a 1996 coil model sierra if it helps with a bias valve in the rear if that helps.
any help will be great guys.
thank you
If it's the booster side you're disconnecting, then the booster will leak air because the check valve is in the hose. I'm guessing you've already flushed and bled the brakes?
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RUN.10W
Joined: Mon Sep 20, 2010 7:17 am Posts: 211 Location: sydney
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Posted: Wed Feb 02, 2011 6:51 pm |
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Yea mate have bleed the brakes a million and one times now, yea I do take the hose off the booster end.
_________________
96 coily, lifted, locked,geared, 33's.
DRV31T
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JrZook
Joined: Tue Aug 08, 2006 11:30 pm Posts: 5517 Location: Holland Park
Vehicle: Awesome!!
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Posted: Wed Feb 02, 2011 11:08 pm |
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steak_knife wrote: Booster is meant to make the peddle soft, that's what it does, It adds no breaking "power" at all..
How do you define braking power? If i drove my car down a hill with the booster attached it would deffo pull up a lot easier and quicker than non boosted. Doesn't it help boost the pressure applied to the piston in the master cylinder?
To the OP have you tried adjusting the pushrod in the booster? _________________ Lil Foot!
http://tiny.cc/gtsw1
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stockman
az supporter
Joined: Thu Nov 05, 2009 10:30 pm Posts: 5319 Location: Canberra
Vehicle: 4wd
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Posted: Wed Feb 02, 2011 11:30 pm |
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Isn't there a diaphgram in the booster?
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Watch out or you'll get sued.
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JrZook
Joined: Tue Aug 08, 2006 11:30 pm Posts: 5517 Location: Holland Park
Vehicle: Awesome!!
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Posted: Wed Feb 02, 2011 11:51 pm |
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stockman wrote: Isn't there a diaphgram in the booster?
yep _________________ Lil Foot!
http://tiny.cc/gtsw1
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royce
omnipotent being
Joined: Sun Jun 11, 2006 11:30 pm Posts: 17216 Location: Pluto
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Posted: Wed Feb 02, 2011 11:56 pm |
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JrZook wrote: steak_knife wrote: Booster is meant to make the peddle soft, that's what it does, It adds no breaking "power" at all..
How do you define braking power? If i drove my car down a hill with the booster attached it would deffo pull up a lot easier and quicker than non boosted. Doesn't it help boost the pressure applied to the piston in the master cylinder? To the OP have you tried adjusting the pushrod in the booster? It doesnt make the brakes work any better, just reduces the amount of pressure you need to apply to the pedal
You should never have to adjsut the pushrod in teh master or booster and not unless you have the manual to tell you what to fo, cock it up and you can end up with a mastercyl that isnt releasing pressure properly so the brakes drag or the booster always slightly on making the engine run funny
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stockman
az supporter
Joined: Thu Nov 05, 2009 10:30 pm Posts: 5319 Location: Canberra
Vehicle: 4wd
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Posted: Thu Feb 03, 2011 12:31 am |
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JrZook wrote: stockman wrote: Isn't there a diaphgram in the booster? yep What would be the out come it was split?
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Watch out or you'll get sued.
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royce
omnipotent being
Joined: Sun Jun 11, 2006 11:30 pm Posts: 17216 Location: Pluto
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Posted: Thu Feb 03, 2011 1:07 am |
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stockman wrote: JrZook wrote: stockman wrote: Isn't there a diaphgram in the booster? yep What would be the out come it was split? Usually the engine will idle high or stall when you press the brake
Note this is press the brake, not pump the shit out of the pedal and wonder why the engine stalls and call it a fault, almost every engine will do that
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RUN.10W
Joined: Mon Sep 20, 2010 7:17 am Posts: 211 Location: sydney
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Posted: Thu Feb 03, 2011 1:30 am |
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Thought have to pump to get some brake pedal...
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96 coily, lifted, locked,geared, 33's.
DRV31T
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masterA
az supporter
Joined: Tue Jan 18, 2011 3:24 am Posts: 976 Location: Perth
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Posted: Thu Feb 03, 2011 2:15 am |
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I had a similar problem with the Nissan Pulsar only to find that the rear brake cyl were leaking?!
You said that you capped the rear brakes off so this shouldn't be a problem but still worth checking
Was the master cyl brand new or reconditioned?
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Fast,Cheap,Reliable-Pick 2 & 3rd is laughable
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