groaning during braking

Took the v70 in for an oil change, the tech said a rear caliper seized
and was able to free it up and changed the pads.
Following this the car makes a loud groaning to shuddering noise from
the rear brakes but only if the car has been driven for some distance
i.e on the highway.
The tech thought the rear rotors needed changing, this was done, the
problem improved somewhat but the groaning can still be induced
following a long 20-30 minute drive.
Any ideas?

--
Posted at author's request, using moderated http://www.AutoBoardz.com interface
Thread archive: http://www.AutoBoardz.com/groaning-braking-ftopict247371.html

On May 16, 1:22 am, kpmg08 <n....RemoveThis@000.com> wrote:
> Took the v70 in for an oil change, the tech said a rear caliper seized
> and was able to free it up and changed the pads.
> Following this the car makes a loud groaning to shuddering noise from
> the rear brakes but only if the car has been driven for some distance
> i.e on the highway.
> The tech thought the rear rotors needed changing, this was done, the
> problem improved somewhat but the groaning can still be induced
> following a long 20-30 minute drive.
> Any ideas?
>
> --
> Posted at author's request, using moderatedhttp://www.AutoBoardz.cominterface
> Thread archive:http://www.AutoBoardz.com/groaning-braking-ftopict247371.html

When does it make a groaning sound.