In theory it's a very simple 10 minute job
The same principle applies front and rear
Jack car and take off wheel
You'll see two steel pins going across the top of the calpier. These have a thin stainless steel plate connected to them
On the inner side of the caliper is a little wire spring between the two pins.
Remove this. Now comes the praying part. You need to remove the two steel pins from the caliper. Ther are often stuck!
If you're lucky they will just pull out from the outside of the caliper. If they have seized prepare yourself for a good battle
If they haven't seized take them out. note the orientation of the steel plate before removing pins!
You can then pull the pads stright out of the caliper. When you do so you should find a little L shaped bit of spring steel. Again, note which side of the pad this came from!
On the back of the pads are two sliding pieces of steel which make the anti-squeal. Hopefully these will be re-usable as they cannot be replaced any more
. If they are then clean them up and coat in copperslip or similar
You'll then need a wooden wedge of some sort. With one pad in position drive the wedge slowly between the caliper piston and the disk on the side without the pad. Be careful and take your time! Also, you should check the master cylinder every so often. As you force the piston back into the caliper you'll be forcing fluid back into the m/cyl and eventually it might overflow!
Repeat the procedure for all 4 (front, 2 rear) pistons
Re-assembley should then be a case of dis-assembley in reverse. You'll be glad you noted the position of the little L shaped spring things and the steel plate between the pins
Overall this is about a 1 (out of 5) spanner job in theory
General tips for removing stuck pins
The one that usually works for me
Get some good penetrating lube. I use Quack, or "Duck Oil" as it is branded lol but anything equivalent should do. In fact I have had very good results with standard diesel which is a very good penetrant!
Soak the pin/caliper join it whatever you use. Give it a bit (10 mins or so). Soak it again. Then get a DECENT pair of Mole grips. Clamp the centre of the pin between the two 1/2s of the caliper. Gently rock it backwards and forwards trying to work the pins loose. If this doesn't work try gripping it to one side of the caliper and be a little less gentle, again rocking back and fore. This concentrates the effort on one side. If nothing happens soak in oil again and go for a cuppa/jolly good rant lol.
If the above simply will not get the baby bathed then some heat is the next option. Be very gentle with a plumbers torch or equiv. You don't want to melt the caliper, just warm it. When everything is warm, soak with oil again and let it cool. Repeat until it does eventually come undone
Under no circumstances start beating on the end of the pin with the 48Lb sledge hammer. You will be tempted but it will only get worse as you spread the end of the pin preventing it from going though the caliper at all
If yo are going to beat on it then use a proper drift, the same size or slightly smaller than the pin. Use a small hammer and hit it with a few sharp ringing blows. Try this while rocking the pins if you have a helper
If none of the above works you'll need to remove the caliper. You can then cut the pins and drill out the holes
HTH
It is sometimes a little difficult to see, so a thorough inspect all around and along the boot might be called for.