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Brake Problem "LOOK"

Started by _UCV80_ , Jul 11 2006 07:48 PM

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21 replies to this topic

#1 _UCV80_

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Posted 11 July 2006 - 07:48 PM

Hey, i know i have asked this same question before in the old forums. unfortunalty the info is gone :<_<:

Brake problem:

Brake are far too touchy! its really soft like there is no feeling, then suddenly whamo! the brakes go on, or even lock up!

I was told it could be a problem with the master cylinder, so i replaced that. Still exact same problem. all brakes have been properly bleeded, brakes where excelent before i striped the car down. brake pedal hasnt been taken out.
i have not touched the proportioning valve thingy ever, although i have taken out the booster and master to spray my bay.

Has anyone had this problem? i know in my previous thread some members said they have this problem, how did you guys fix it?

Brake pads are $10 ones off ebay.

any help is grealty appeciated,

Thanx!

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#2 dattoman

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Name:Neil
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Posted 11 July 2006 - 07:52 PM

So the pedal is low and has no feel then suddenly its lockup ?

Sounds like the reaction disc has fallen out of the booster

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#3 _UCV80_

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Posted 11 July 2006 - 08:12 PM

not sure how it could have fallen out, but! my previous garage had a grass floor and roof "n" walls made from tarpolens

the day after i moved the whole "garage" collapsed from a storm, would have been a mess haha.

anyway

anyone else agree with "replace the booster" ?

are dual diaphram much better then a 6cy booster? I want good brakes for my lil torrie.

Thanx dattoman!

,nathan

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#4 _UCV80_

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Posted 11 July 2006 - 08:15 PM

pedal isnt exacly low, its normal height.

about 2-3 inches of travel then it grips and u get jolted faward, its quite dangerous

definatly a sudden lock up

cheers,

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#5 dattoman

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Name:Neil
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Posted 11 July 2006 - 08:18 PM

I didn't say replace the booster
I said the reaction disc may have fallen out
If so then it needs to be refitted in the correct spot in the booster

It can dislodge when the master cylinder is removed

You need to check this first and see if thats the issue.
Its a round 20c piece sized piece of rubber about 4mm thick that goes in the centre of the booster. Pullt he master out the way. Pullt the front seal and ushrod out and see if its stuck to the pushrod or still in the centre of the booster.
If you can't see the black disc go buy a VH2013 reaction disc. Might pay to get a VH2015 front seal and replace that while your at it.

V8 double banger booster will not improve the braking. It will make it easier to apply the pedal (in regard to amount of foot pressure needed)

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#6 _UCV80_

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Posted 11 July 2006 - 08:32 PM

ah ok... thanx heaps! ill pull it out and have a look tomorow :spoton:

iv just been told that pulling down a brake booster is the hardest thing to do on a torana in the shed. thats why i jumped to replacement,

ill chek it out tomorow,

yea thats what i thought, the v8 booster will just make it easier for people with chicken legs. more booster touque could just make it easier to lock up there for being a bad thing for a 6cy. hmmm who knows, ill stick to the standard!

thanx heaps! :spoton:

,nathan

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#7 _micksgtr_

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Posted 11 July 2006 - 08:39 PM

if dattoman says thats what you need then thats the go matey!!!
cheers

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#8 _UCV80_

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Posted 11 July 2006 - 08:42 PM

i definatly have alot of faith in dattoman's answers :spoton:

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#9 makka

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Posted 12 July 2006 - 11:59 AM

i had the same problem, it was the reaction disc

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#10 knoath

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Posted 12 July 2006 - 12:34 PM

I've noticed similar on the UC I'm getting RWC'd Thursday... although I haven't driven it on the road, just moving it around the back yard etc I've noticed the brakes are very touchy.
Can the reaction disk dislodge itself without messing with the Booster (removing or dismantling the booster) cos my booster looks like it's never left the firewall.

Edited by knoath, 12 July 2006 - 12:34 PM.

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#11 _UCV80_

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Posted 12 July 2006 - 05:16 PM

i pulled the master back,

and pulled out the metal pole thingy :<_<:

all that came out was a reaction disc and the pole. as shown in picture

anything missing?

some pictures!
Posted Image

cheers

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#12 dattoman

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Posted 12 July 2006 - 10:04 PM

What you have there is the front seal and pushrod
Replace that front seal while you have it out and lube the rod up with rubber grease...... not normal grease or petroleum jelly

Looks to me like the reaction disc is missing from the booster pic
It looks to me that I can see steel in the centre where I should see rubber.... a straight on pic would have been better

I'd say the disc has dislodged and you need to replace it

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#13 LXCHEV

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Posted 12 July 2006 - 10:11 PM

When I first rebuilt my LX I did this exact same thing - it turned out the reaction disc had indeed fallen out, causing the exact behaviour you've described. It was an absolute cow of a thing to drive like that, unbearable!!!! Once I replaced the reaction disc though, brand new!

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#14 _torana_

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Posted 12 July 2006 - 10:42 PM

dattomans right

my disk fell inside the booster, when i repainted it. Look for it in there ( have to remove booster from firewall, turn around so brake vacuum port is at the bottom and shake ) if its in there youll see it. Pulling it out of there is the fun part ( took me an hour with long nose pliers )

best of luck
cheers julian

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#15 dattoman

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Posted 12 July 2006 - 11:06 PM

dattomans always right

Fixed

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#16 _UCV80_

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Posted 13 July 2006 - 03:37 AM

sweet

so where does it actually sit inside? just over the metal circle?
thanx for the part numbers

do i need to retrieve the old one? or just go ahead and put a new one in

another picture
Posted Image

Thanx again!

Edited by ToranaZ, 13 July 2006 - 03:39 AM.

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#17 dattoman

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Name:Neil
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Posted 13 July 2006 - 05:28 PM

Yup its missing alright
It goes in that round bit where the metal circle is

You don't "need" to get the old one out
Its just a bit of rubber floating around in there and can't really cause any damage
If your paranoid you can try though

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#18 GML-31

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Posted 13 July 2006 - 05:49 PM

try hooking it with a bent coat hanger if you really want it out

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#19 _UCV80_

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Posted 14 July 2006 - 04:37 PM

my new reaction disc has a knob in the centre on one side

how does it go in? do i bond it to the push rod to make it easier

which side does the knob go onto?

Posted Image

cheers,

also where does the seal sit on the push rod? up at the opening or further in there.

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#20 dattoman

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Posted 14 July 2006 - 09:30 PM

cut the knob off with a pair of side cutters
put some rubber grease on the rod so its tacky and holds the disc while you put it in......
The front seal goes on the outside of the cannister in the recess
Close to the master cylinder end of the rod