HELP ME PLEASE, Big brake problems!!!

[Wagon_Wheel]

Hey dudes,

Have put Twin piston upgrade kit on my front end.
Everything bolted on fine, no dramas there.

First had trouble with bleeding the brakes, kept getting air through the lines.
Found out was leaking from the master cylinder, replaced that, all good, its not leaking now.
Bled all 4 brakes, all seemed fine, pedal is firm as a brick, and pressure in it seems really good, how it SHOULD be.

Started the car.... No F'in front brakes...
WTF is going on.....
It is firm as hell while the car is OFF, but as soon as i start the car and put my foot on pedal it sinks to the floor.
Cannot find a leak any where, bled the brakes again, trying both when car is off and when car is on, and no air came through the lines, yet still NO BRAKES.

Cant some one please help, cars been off the road for a week doing this crap, and im completly over it, i need it back on the road, so i can take it to scrap metal!!!!!!

Cheers,
Geoff

[stockvp]

ok ive never done it, but have you got the v8 master cyclinder coz you need that .
then when you bleed you start from the furthest point to you get to the driver front then all should be bonza
hope this helps

[Wagon_Wheel]

I replaced the master cyl with the exact same one it had, but BRAND NEW
Found out its because of the ABS module, but not sure what to do about it

[stockvp]

No good, not sure about ABS, but im 100% you need a v8 M/C. clean up the new one see if you can swap it for a v8 one, i think there a 1 inch unit. i take it this is for your vn? as i have a vp and i know that i need these things for mine

[slo_firo]

bleed the crap outa it - there will be air in the system, try a pressure bleed tool perhaps

[Wagon_Wheel]

Stock VP, IT IS A V8 ONE!! its for my vs clubsport.

And slo firo, we have bled the absolute crap out of it, ive gone through 5 bottles of brake fluid so far

[AirStrike]

No good, not sure about ABS, but im 100% you need a v8 M/C. clean up the new one see if you can swap it for a v8 one, i think there a 1 inch unit. i take it this is for your vn? as i have a vp and i know that i need these things for mine

There is no such thing as an ABS 1" master..........wish people wouldn't post when they have no idea
To only do it when the car is running tells me its a vacuum issue, double and triple check all the vac hoses mate.

[sedate looking]

There is no such thing as an ABS 1" master..........wish people wouldn't post when they have no idea
To only do it when the car is running tells me its a vacuum issue, double and triple check all the vac hoses mate.

Thinking the same thing... Double check the main vacume line going to your brake booster. Make sure it is not kinked, or off or split...... Does the car run a little rougher at idle then it did before? Another good sign of a nice big fat vacume leak...

[sixshooter]

How can it be a vacuum leak guys ?

If he has vacuum leaks to the brake booster then the brakes would be hard as bricks.

The booster just assists the driver by taking the pressure off the pedal.

He's most likely got a leak somewhere in the lines or calipers... How were the piston seals in the 2 calipers before you put them on ? Did you notice any fluid leaks anywhere ?

Other than that I'd look at fitting the master cylinder that matches the calipers. What are the calipers off ???

[minux]

If it is a leak, surely he would see brake fluid.

Give a brake place a call, explain your issues over the phone. Some are usually nice enough to give you a remedy. If that is the case, take them down a 6 pack of beer..

Haven't heard of this issue before.

[stockvp]

[QUOTE=AirStrike;744112]There is no such thing as an ABS 1" master..........


Who said that, I was talking about the master cylinder not ABS, as i said not sure about ABS.And how big is a V8 M/C compared to a v6 are they the same size,


Wagon Wheel,
just in casse
when you bleed your brakes, tighten the nipple before you release the foot brake.
And before the next, pump once to build pressure and then slowly push brake not all the way then tighten nut and realease do this until no air bubbles

[Doctor Bob]

you need to bleed the abs properly, it should be done with a tech1 to activate the abs correctly to enable bleeding.
you may get it back by forcing the abs to operate on grass, sometimes this gets small air bubbles out of the abs unit.
if not get it somewhere that has the equipment to do it properly.

Rob

[Not_An_Abba_Fan]

Yep, totally agree. A tech1 will cycle the ABS valves so you can get all the air out of them. You could try bleeding at each line where they come out of the ABS unit, then bleed the wheels again.

I bet you didn't bleed the M/cyl before you fitted it.

[Emackulation]

Best of luck with this ABS issue, Hope your having better luck then me

[Wagon_Wheel]

Thanks for the advice guys.

I dont think its a vacum issue as i didnt touch any of the vac lines, and car idles and runs perfect. But will double check any way.

I rang a bloke at a brake joint today who we deal with through work, who has had 30 years experience..... and he was a total dick, didnt help me at all.
Just told me i had to have the vt booster or it wont work at all, and that amateurs shouldnt be attempting to upgrade there brakes etc etc.
And told me to put it on a tow truck and take it to his shop, dick head.

Having another crack at it soon

[stocky]

Just told me i had to have the vt booster or it wont work at all, and that amateurs shouldnt be attempting to upgrade there brakes etc etc.
And told me to put it on a tow truck and take it to his shop, dick head.

shouldve said that if he watched what he said you wouldve taken it to his shop, but now youll pay someone else to do it

[Wagon_Wheel]

Woops, double post, but good idea stock lol

[AirStrike]

[quote=stockvp;744189]

There is no such thing as an ABS 1" master..........


Who said that, I was talking about the master cylinder not ABS, as i said not sure about ABS.And how big is a V8 M/C compared to a v6 are they the same size,


Wagon Wheel,
just in casse
when you bleed your brakes, tighten the nipple before you release the foot brake.
And before the next, pump once to build pressure and then slowly push brake not all the way then tighten nut and realease do this until no air bubbles

You really are a ********!! THERE IS NO SUCH THING AS A 1" MASTER TO SUIT ABS!!!

[Garth]

Thanks for the advice guys.

I dont think its a vacum issue as i didnt touch any of the vac lines, and car idles and runs perfect. But will double check any way.

I rang a bloke at a brake joint today who we deal with through work, who has had 30 years experience..... and he was a total dick, didnt help me at all.
Just told me i had to have the vt booster or it wont work at all, and that amateurs shouldnt be attempting to upgrade there brakes etc etc.
And told me to put it on a tow truck and take it to his shop, dick head.

Having another crack at it soon

dont bother, you are waisting your time

you cant bleed abs as you would nomraly, there is a tool for bleeding the abs unit. becasue you catn get pressure up without the abs unit kicking in.

take it to holden champ. your just gonna keep bashing your head on the wall.

[Emackulation]

dont bother, you are waisting your time

you cant bleed abs as you would nomraly, there is a tool for bleeding the abs unit. becasue you catn get pressure up without the abs unit kicking in.

take it to holden champ. your just gonna keep bashing your head on the wall.

I agree, take it to a workshop of your choice. I did this today and found my car is okay!

[Wagon_Wheel]

[QUOTE=AirStrike;744479]

You really are a ********!! THERE IS NO SUCH THING AS A 1" MASTER TO SUIT ABS!!!

Whats the one on the VT, that ppl keep saying to get then???

I agree, take it to a workshop of your choice. I did this today and found my car is okay!

Yay!!! Good work man

[Wagon_Wheel]

Well, for starters, originally i was told the bleeder nipple had to be on bottom, then after research today its spose to be on top, so swapped that around and it worked better.

Bled once again, and i actually have brakes now, but its not 100%, bit spongy etc, so i think i will take it some where to get bled properly, cause of homo sexual ABS

Thanks HEAPS for your help guys, i will still ask questions until its fully resolved and i will let you know the outcome!

[Wagon_Wheel]

Had an attempt at bleeding master cyl and abs module today, and no good, bloke seems to think its the booster.
Which ****es me off cause ive just spent $162 on a brand spanking master cyl, and if i now decide to upgrade to vt booster and master, then ive wasted that money, and a few litres of brake fluid and all this bull crap, its seriously making me HATE my car.
Or will standard VS booster and VS master be ok with these brakes?
Its doing my head in

[Doctor Bob]

geoff, get the pedal as good as you can, drive it on grass & lock the wheels so the ABS activates, this "might" clear the air in the system...
what are the twin piston brakes off?
you may need a bigger master cylinder to supply the bigger brakes with enough fluid to get a decent pedal feel, the guuy at the brake joint was right in one repect, if you dont fully understand how they work you shouldnt be changing things.lol as you found out
and as for the bleeders on the bottom, ive never seen air bubbles sink in liquid.lol

Rob

[Wagon_Wheel]

Will try that, dads gonna have another crack at it tmoz while im at work, i will try and get it as good as i can and i will try the lock up thing, will that clear the ABS unit of air complelty or just move it, and then ill have to bleed somthing again?
Will try and take it somewhere but prob wont be able to book it in any where til monday/tuesday.

If the booster does need replacing, will standard be ok or not?