S60 rear caliper replacement proceedure

[lixah]

Hello,

I just wanted to say, if any of these questions seems obvious or stupid, i am a novice and just doing the bits that I can , on my car.

so i recently started to get a scraping noise coming from the rear offside, having taking a look the pads are completely worn down to the metal on the offside, however the nearside still has a decent amount of meat left on it,

I decided to replace all the rear pads and rotors, however when i went to compress the offside caliper i really struggled, i assume (please enlighten me, i dont really know) that this likely means this caliper is due to be replaced?

I was able to compress it using a metal D clamp, but it was quite difficult, so just wanted opinions really, should i replace this caliper?

the second part of my question,. i've researched the job quite a bit, it looks fairly simple to replace, however regarding the bleeding of the brake, i assume i only need to bleed the single caliper, not all 4? and is there anything special i should know about the bleed procedure?

Regards, Matthew