i was driving with warped brake discs from 6 months.
when i went to get them machined yesterday, they also checked the brake pad and told the brake pads need a change as well.
The old brake pads were only a year old.
That is - they replaced my 1 year old brake pads, which were driven for 16,000 km's only.
However after machining brake discs and changing pads, i see a noticeable difference and no more steering vibration whilst braking.