Thought I'd use a more accurate title now I know what a 'sonic ring' is!!

I've had a look under the car now and the toothed ring is indeed pretty far gone
with rust. I now have two questions- would the rustiness cause the ABS sensor to
mis-read the speed of the wheel and cause the brake pedal to kick back, and a
slight knocking noise from the front of the car? Although the ABS loght doesn't
come on..

Second, is the Haynes 206 manual -which doesn't cover the 180 GTi- likely to be
any help in replacing this driveshaft, when the need arises? Or is there a
'real' 180 GTi book? Sorry, that's three questions.

All your thoughts welcomed!

Alex.