Hi everyone, my problem has probably been asked and answered many times before, but I cannot find them so sorry for repeated questions! My Octavia mk2 2011 VRS diesel estate has a binding rear caliper  coming from the handbrake part of the caliper. I want to change the caliper or both rears, Please can anyone tell me which calipers are fitted to this car and where can I get some new or recons that will fit. I have looked on ebay and found a set and the ebay vehicle fitment thing said it would fit, so contacted the seller just to make sure, turns out they don't fit! So please any help? 

I think there were two different calipers in use on the mk2 Octavia so best to find out what yours are from the markings on them before buying any. 
Before you go down the route of changing the calipers make sure it’s not the hand brake cable that isn’t binding. You’ll need to Jack the wheel up safely unhook ( hand brake off) the cable from the  arm on the caliper. Rotate the wheel to see if it turns freely and apply the handbrake to that wheel by pushing the arm forward with the handle of an hammer then checking it releases again. 
You can get rebuild kits for the caliper too which isn’t as hard to do as you think. Of course if the handbrake is binding it is usually rust on the arm spindle but that normally goes along with a weeping seal too.

Thank you for your help! I will have a look at the caliper id at the weekend, again thanks 

FYI If you have a leak at the handbrake mechanism, it's only an internal o-ring that needs replacing, nothing special.  The external seal (usually perished) behind the lever is just a dust seal and you can supplement it with petroleum jelly, silicone grease etc on rebuild to help keep dirt out.

 

If you're good with your hands and have done it before, you could remove the piston and all other parts from a caliper, clean, inspect and rebuild ready for bleeding in an hour or so.

 

Personally I like to remove the caliper from the car so I can reduce it to component parts and give everything a good scrub in hot soapy water.  Dry all internal ways immediately with a hairdryer otherwise you will get a micro coating of rust forming on the iron.

 

Unless there is a leak you shouldn't need any new parts, just strip, clean and rebuild for another few years of trouble-free service.

Common with VAG and as @CWARD above says there are generally two types. These have different diameter piston and different spacing between the sliding pins. If the piston size is not marked on the caliper (36 or 41, I think) then pin spacing is a good guide and quite different. I think the smaller caliper has ribs across the top whereas the larger one is smooth and rounded, but don't quote me on that.

 

Usually cheap enough on eBay that messing about with rebuilding is not worth it.