Hi, first post on here - hope you can help me diagnose whats going on with my daughters A3 - its a 2014 2.0 TDI.

It had a clutch change back in August due to failing slave cylinder and all was good. However when driving it this week the clutch pedal is doing something odd. It not returning after the clutch pedal is pressed - this happens quite often - not every time I press the clutch - but certainly on every journey.  And if I drive the car after braking from say 40-20mph a couple of times then the clutch pedal will move downwards when I press lightly on the brake pedal - but not touching the clutch pedal.

I'm trying to figure if the clutch master cylinder is at fault or if its the brake master cylinder. Brake pedal feels ok - not spongy.

Any recommendations appreciated

Thanks

M

It might be an issue with the clutch release spring etc. 

Do the brake and clutch master cylinders have a common reservoir on this model?

Hi, Yes it's a common reservoir on the car.

 

That might explain why the brake pedal can influence the clutch pedal. I'd look to a fault in one or other of the master cylinders, but it would probably be as well to change both of them as they are the same age. I assume you had the slave clinder replaced at the same time as the clutch.

Thank you, yes agreed it's probably a clutch or brake master cylinder problem. Was keen to see if someone else has suffered from this and how the problem was fixed. It's very strange behaviour.

19 hours ago, A3 Mark said:

Hi, first post on here - hope you can help me diagnose whats going on with my daughters A3 - its a 2014 2.0 TDI.

It had a clutch change back in August due to failing slave cylinder and all was good. However when driving it this week the clutch pedal is doing something odd. It not returning after the clutch pedal is pressed - this happens quite often - not every time I press the clutch - but certainly on every journey.  And if I drive the car after braking from say 40-20mph a couple of times then the clutch pedal will move downwards when I press lightly on the brake pedal - but not touching the clutch pedal.

I'm trying to figure if the clutch master cylinder is at fault or if its the brake master cylinder. Brake pedal feels ok - not spongy.

Any recommendations appreciated

Thanks

M

Hi its the clutch master cylinder, when the clutch is changed they usually let the pedal go down to the floor which means an old cylinder seal and piston has travelled far further than it would ever have done before, this damages the seal and it won't ever recover, they are not to bad to fit but if you fit a new unit please use Comma ESP4 fluid as most other fluids eat the new seal on the piston in short order and ESP4 is bang on the same as the Audi fluid but a third of the price.

Steve.

Thank you.. great to know what has happened and what needs fixing. Much appreciated 👍 

M