![Evil or Very Mad :evil:](./images/smilies/icon_evil.gif)
When I got my '67 912, it drove fine at speed, apart from the fact that the tyres were worn to illegal levels. To get it through the MoT, I had the front calipers rebuilt, put new brake pads in (one had seized and worn a pad right down to the metal), and fitted new Vredestein Classic tyres.
Since then, the first time that you get the car up to over 70mph on a journey, after a couple of miles there will be a gentle knocking which seems to be coming from the nearside front wheel.
It slowly gets worse and worse and increases with the revolutions of the wheel. If you slow down to under 50mph, then it will ease off until gone. The odd thing is that 95% of the time you can then take it back up to 70mph for the next couple of hours if you're on a long journey and it will never happen again!
In case it was a tyre out of balance, I swapped the wheels over from front to back, but it's still there. I also trimmed a bit of 'flappy' rubber that was left from the moulding process off of the tyre but that didn't help.
However, there is one other thing that I haven't investigated. When the seized caliper wore the pad down to the metal, it scored the brake disc. This has now resulted in the new pad wearing, but with a ridge through the middle where it meets the indent in the disc and doesn't wear as much.
Is there any possibility that this could be causing some kind of knocking when it first gets up to speed and starts to get really warm, but then easing off and/or braking then causes the pad to seat itself better?
Any thoughts? Please?!
![Sad :(](./images/smilies/icon_sad.gif)