Clutch pedal issues

[Billman]

I got stranded (at least for ten minutes)!!!!

As I was driving on the highway when pressing the clutch pedal to go from fifth to sixth it just stayed down. The clucht was engaged so I could not go to any gear.

After putting the warn sign and way about to call raid assistance I simply pulled the clutch back up and after that everything was as normal!!! WTF????

Clutch disc, plate and bearing are 17000km old.

Today the clutch pedal stuck again. I have noticed that both times that happened while I was overtaking in high gear / fullthrodle / high boost and I wanted to change in higher gear. Can it be vaccum / boost related issue? Because after that I pulled the pedal by hand up and it continues to work just fine.

[DEREKCO]

Clutch Pedal

Check your clutch springs on the pedal mine did the same I found the springs were broken so not returning pedal

[UrS4boy]

Clutch pedal failure modes and Clutch Master and Slave info

Could be mechanical (broken pedal, broken return spring) or hydraulic (borked master or borked slave cylinders). I am guessing your's is slave cylinder-related.

Some reading for you:

http://forums.quattroworld.com/s4s6/msgs/24719.phtml

http://forums.quattroworld.com/s4s6/msgs/186276.phtml

http://forums.quattroworld.com/s4s6/msgs/41316.phtml

[Rikki Kitto]

Mine used to do this turned out it was the slave cylinder

[220bhp]

It may have been covered in Daves thread If not there is a 6 mm rod on the master cylinder that can fail in two ways. It can break, or it can bend. Resulting in your symptoms.

[Billman]

Ι completed my journey doing another 350 km.

I will start by checking the spring and then change the master/slave cylinder.

[popdemonic]

BTDT.It occasionally did that when i had old master or slave clutch cylinder.

[Billman]

So I took the driver foot panel off and the only thing that looks broke. Is that sleeve.

[Billman]

The clutch pedal has 2 springs and according to the parts catalog it uses the 8A0721401 master cylinder which according to a German forum it has an M8 rod thread while all the others with one spring have M6 thread.

[Rusty]

Has the rubber filled joint failed? I sell a brace which fixes this

[Billman]

Has the rubber filled joint failed? I sell a brace which fixes this

Did not see anything there. Do you have a picture to show me so that I can check!

[Rusty]

When you press the pedal, the linkage to the master cylinder kinks rather than pushing. The bit that fails is about the size of a large coin and is filled with rubber, which disintegrates, causing the failure.

[Billman]

So the circlip that holds the slave cylinder piston not jumping out failed. That caused the issues.

[UrS4boy]

So the circlip that holds the slave cylinder piston not jumping out failed. That caused the issues.

That sounds familiar.

[Billman]

I bought a Febi bilstein one now (originally on the car was a Sachs) and it needed a slight trimming on the outside in order to fit as it had some minor casting flaw.