On 07/05/2017 21:43, Steve Walker wrote:
On 07/05/2017 13:41, Andy Burns wrote:
Dave Plowman wrote:

Generally, discs need replacing every second set of pads.

That seems to be the way, though the garage generally tells me I've
been "lucky" as modern discs and pads are intended to need replacing
at the same time.

I do my own maintenance and only use a garage for a few things (welding
a sill, replacing a cambelt and replacing a dual-mass flywheel) that
would have cost me more in time off work to do it myself than for them
to do it.

In 30-odd years I have only replaced discs on two cars, both due to
slight warping - I have never worn a disc to the minimum even on cars
that have had numerous replacements of pads and mileages of 160,000+.

Are garages pushing unneccessary changes for profit?

Some will.
My MOT advisory said pads were close to limit but the service guy said
they were not and didn't need doing.

discs wear more than they did before asbestos was removed from the pads.
The pads are harder and need servos to work these days.