G'day everyone

Since I have owned my T it experiences a knocking sound after startup.

Series of events:

Startup, drive to almost exactly 10km/h (every time), then it goes knocka-knocka-knocka-knocka-knocka and then no more noise until next startup.

Braking performance is normal. I was told that it was the abs unit - because the discs and pads were worn out - but after I fitted new discs and pads the noise came back. I got one start and take off without any noise - woohoo!

Any ideas guys?

Cheers,

Chris

that's just the abs system doing a selftest mate,that's why it does it after each cycle of the key. Nothing to worry about at all.

Mine does the same...you start it...then put it in drive and about 5 seconds later you hear that knocking noise for about 3 seconds and then nothing everything is normal...mine does this without fail every time...I have always wondered wether this is normal...

hmm fair enough - I just thought it was a bit unusual that a near new car would make such a noise...

here's a possibility - when I was dismantling my front end (for some nice new nolathane bushes to go in) - I noticed that the brake line coming through the bodywork on the passengers side had chopped through its grommet. I'll fix this and see if it fixes the problem once I get the front end back together.

Hey Mate, the noise you describe is definitely the ABS carrying out a self test. My old Ba, the current Bf2 and the old mans Fg all go through the same sequence.

Cheers

ABS self test..

Next service just get them to check the sensors are ok... I had one a bit flakey on the startup test thingy... but once the car had moved and hit the brakes it was fine... Dealers wasnt sure why the 'test' wasnt 100% but the ABS sensor and rest of the system was fine!

They just replaced it anyays..

Edited September 3, 201016 yr by smicky

the manual which comes with the car explains this noise as the ABS selftest.