brake problem megane 2003 1.6 vvt?

A spongy brake pedal is usually associated with air in the system,would have tried bleeding brakes first,rear calipers are usually prone to seizing,ie poor handbrake/footbrake efficiency,would,nt have thought changing discs and pads would have improved pedal unless they were badly warped,they must have had their own reasons for changing the rear brakes,you could ask them

wickham
May 2010