Got the pads and discs cheap, some one had purchased them but never fitted, whilst pushing in one of the pistons on drivers side calliper it was more stiffer than the others, took her for a test drive and the drivers side disc was hotter than the others.
That is possibly because the rubber cover has split or become porous and the piston has rust on it's outer edge causing a bind. These are things you should be sorting, you can get new piston and seal sets.