I have a c5 estate, and have recently replaced the rear disk pads. It's an easy job to do yourself and cost about £15 for the pads. It's best to put some copper grease on the calipers at the time and you should not get a problem. The front tyres have done 18,000 mile so far and still have about 3mm on them. So I would make sure if I were you to make sure the trye pressures are correct and to avoid heavy breaking if possible; something that should be done with any car. Most people do not check their tyres and electrics enough!
