Anyone sensible will fit a pair of rear discs and a full set of pads, roughly £60/£80 from factor, hopefully it only needs one caliper @ approx £70/80.

Its entirely possible the other caliper is in equally bad condition so maybe the garage for the sake of another £70/80 is intending to fit one for safety's sake, can't say i blame them if it looks like its on its last legs.

edit...just reread your post and you do mention calipers, so price near enough right.

Not sure what the housing is in this case could be the back plate or the bracket the caliper is mounted on x 2, these will be genuine parts only, indeed the garage may be quoting genuine parts for everything.

Sounds to me like the car has been neglected, it didn't get like this overnight, lack of proper servicing does work out expensive when the parts involved corrode severely enough to seize which is happening here.

You could always get another quote.

Edited by gordonbennet on 24/10/2013 at 19:40

Could it be wheel bearings/hubs as well. You could also go to kwikfit or national tyres for free quote, and kwik fit give a lifetime warranty so no need to pay for discs pads again. price for all from indie would be fair, don;t forget it IS 10 years old, and easier for rear calipers to stick as less use. my 30 month old chevrolet had sticking rear pad, but got away with just pads...........