The connector between the clutch master cylinder and the hard pipe can be cylindrical, round or look just like a nut/gland. I am assuming this is what some people are seeing. AFAIK, the circular one doesn't contain an asymmetric valve and most of the variants seem to be interchangeable.

EDIT: there is no valve listed in the parts catalogue.

So has anyone actually found out what the OP was refering to with the CDV??

Theres the clutch pedal.. then master cylinder.. then pipework to the slave cylinder.. then the slave cylinder that goes straight onto the release bearing that pushes the clutch pressure plate to release the friction plate off the flywheel.. nothing else...

 

If you follow the hard pipe from the master cylinder across behind the inlet manifold right behind the vac pump on bulk head is a round silver thing in line on the clutch hard pipe. 

Just looked on mine and it's easy to spot.

Certainly looks like some sort of valve to me

If you follow the hard pipe from the master cylinder across behind the inlet manifold right behind the vac pump on bulk head is a round silver thing in line on the clutch hard pipe.

Just looked on mine and it's easy to spot.

Certainly looks like some sort of valve to me

can you put a pic up please..

my fabia is at home but iv just looked at a 6R polo (shud be the same as fabia) iv got gearbox out of at wrk atm and there's nothing to indicate any valve..?

I've removed it off my BMW M3 as it does make a difference. biting point and travel is always consistent and much sharper.

 

which is what the fabia is not lol. mine seems to find going into first a no go sometimes. but all of a sudden the clutch pedal will juder and it will go in fine. also I find the biting point can go from really low to half way.

I'll grab a picture tonight if I can get good enough light, it's connected within the clutch pipe as said previous on the right hand side of the firewall. I could see it without taking anything off.

Is this CDV related to the brakes as when I brake in first gear, the clutch engages. The harder I brake the more aggravated the clutch gets. Basically even with the clutch down all the way down, First gear, I brake: the clutch slowly starts to engage and the car creeps forward

Is this CDV related to the brakes as when I brake in first gear, the clutch engages. The harder I brake the more aggravated the clutch gets. Basically even with the clutch down all the way down, First gear, I brake: the clutch slowly starts to engage and the car creeps forward

 

Its only in the clutch line,so shouldn't effect it.

 

But the clutch takes its fluid feed from the brake master cylinder,so might be worth checking your fluid level ASAP 

Well it must only be on the VRS.. checked mine (was a pd100 originally) and the polo at work + neither have anything in the pipework.. iv seen them where they have a corner piece as the pipe goes under the ABS but thats not a valve its just a corner piece for the pipes to clip in..

Still not convinced till i see one up close and have a propper look at it. Looking at that silver bit you've pictured if it was a valve there is no way of adjusting it as there isnt a connector on it so cant think how it would work without a CU controlling it?

Well it must only be on the VRS.. checked mine (was a pd100 originally) and the polo at work + neither have anything in the pipework.. iv seen them where they have a corner piece as the pipe goes under the ABS but thats not a valve its just a corner piece for the pipes to clip in..

Still not convinced till i see one up close and have a propper look at it. Looking at that silver bit you've pictured if it was a valve there is no way of adjusting it as there isnt a connector on it so cant think how it would work without a CU controlling it?

 

There must be something inside it,its not just a connector.

It must be some sort of valve that lets full pressure through in one direction then lets the fluid bleed back through at a lower rate?

Which is what the BMW's have fitted.

http://s236.photobucket.com/user/m_maybury/media/20140115_150850.jpg.html]

thats on a non vrs ^^

Edited 15 January, 201412 yr by mattvrestate

I believe the purpose of the valve is to prevent the DMF from being destroyed by an idiot dumping the clutch on a high-torque turbodiesel.

 

coskev got it right.

There must be something inside it,its not just a connector.

It must be some sort of valve that lets full pressure through in one direction then lets the fluid bleed back through at a lower rate?

Which is what the BMW's have fitted.

 

Unless I'm seriously wrong, it's just a restrictor pipe - I don't think it has any moving parts so I don't see how it can break (unless VAG are different, although I didn't think the Fabia even had one).

 

Some photos to show what I mean:

 

http://www.e90post.com/forums/showpost.php?p=4361660&postcount=15

 

http://www.bimmerforums.co.uk/forum/f2/clutch-delay-valve-cdv-e36-e46-e39-t95725/#post839706

I believe the purpose of the valve is to prevent the DMF from being destroyed by an idiot dumping the clutch on a high-torque turbodiesel.

coskev got it right.

that would explain why mine + the polo didnt have one.. both have single mass flywheels from factory.. Well iv never heard of one faulting.. seems BMWs are the only ones with issues.

They don't have reliability issues, they're just a stupid idea! I think they're meant to smooth out the clutch engagement (it's certainly very hard to pull away jerkily), but in doing so they slip the clutch a bit and make faster gear changes and pulling away quickly harder.

Unless I'm seriously wrong, it's just a restrictor pipe - I don't think it has any moving parts so I don't see how it can break (unless VAG are different, although I didn't think the Fabia even had one).

 

Some photos to show what I mean:

 

http://www.e90post.com/forums/showpost.php?p=4361660&postcount=15

 

http://www.bimmerforums.co.uk/forum/f2/clutch-delay-valve-cdv-e36-e46-e39-t95725/#post839706

 

Could well be just a restrictor.

 

But must be abit more in the one on the VRS I would think looking at the shape/size and the way the pipes enter/exit.

The notchyness you describe from first to 2nd (sometimes getting stuck in 1st) is a common side-effect of running a single mass flywheel.

To get passed it the best way is to rev to about 2.5k rpm + in first then change to 2nd. This should work perfectly. Its when you short shift to 2nd is when the problems arise. Rev it higher in 1st and it'll be brand new

Edited 15 January, 201412 yr by BigJase88

Thanks Jase, but the odd thing is the clutch still engages with the clutch all the way down. This surely can't be right? I understand the SMF can't do the same job as a DMF so I expect some side effects. But the clutch auto-engaging seems weird. Also when I drop the clutch to get out of second into third, I can still hear the clutch is engaged, so the clutch needs to be doubled clutched, sometimes that doesn't even work : (

You definately have an issue their thats beyond me....

Something deffo not right, but for anyone else with an smf conversion the struggle to get out of 1st at low rpm is not uncommon. I had 3 cars with helix's and smf and each one was the same, 2 of them i got fitted from new.

Yep thanks for the tip, I'm pretty certain you did advise me of 'revving it out of first gear' back in summer 2013 :-)

Works a treat sometimes, others not, but I think that's just due the underlying issue

It's booked in for investigation next week. I'll keep this thread updated

Have you tried pumping the pedal to see if its a bleeding issue you've got?

 

Pump it a few times fast then try your clutch, if it feels better/doesn't engage you must have air in the system.

going to try and get my mechanic to take mine off today whilst hes got the car to fix a botched subframe.

going to try and get my mechanic to take mine off today whilst hes got the car to fix a botched subframe.

post up your results if he does it please