MK2 Facelift Brake Squeal!!

Hi all,

I have a mk2 facelift blackline estate, TDI vRS.

So far I have replaced all discs/pads (with OEM Pagid) - everything is correctly greased with the right stuff, all hardware is new (anti rattle etc).

I have rebuilt the NSR caliper - when taking it apart it was perfect so didn't really need doing

I have replaced the OSR caliper with a new OEM unit

I have developed a horrendous brake squeak that started before I changed the brakes. I have done so in order to try and eliminate it.

I originally  thought it was coming from the front, but now I think it is the rear.

A few symptoms:

• Brake squeal when hot (plus 10 minutes of driving)
• Brake squeal stops if I push the button in on the handbrake and lift it slightly when driving (this indicates rear brakes)
• The noise is almost consistent. I can relieve it by dabbing the brakes but it comes back within a couple of seconds
• The noise seems to be worse occasionally when turning right
• The noise is a high pitched, metal on metal sound that is rotational which suggests brake drag
• The pads have worn evenly on all calipers
• I have rebuilt the brakes (on every corner) at least 5 times
• All greases etc used are OEM spec and exactly correct, applied correctly
• The anti rattle shims are all new and in great condition. All surfaces the pads touch have been wire brushed and are fine
• I have taken a small edge off each of the pad "ears" to ensure they are not catching when being applied
• All pads move smoothly in position
• It is 100% not the back plates. They are not catching at all - believe me I have ensured they are all in the correct position and have even taken them off and refurbished them
• I have chamfered the top edge of each brake pad to ensure it is not catching on the outer edge of the disc

I am a very competent mechanic, and this is the first time I have ever come across something like this

If I don't sort it out soon I am going to lose my mind!

Some pictures:

The car

When I did the fronts:

Things I can think of:

• Rear wheel bearing? All have seemingly no play but someone suggested on faceyb owners club group that he had something similar and the bearing fell apart when he removed it
• Setting up a microphone system to ensure I am focusing on the correct corner. Its been pretty much impossible to identify whilst driving and I have got someone else to drive the car so I can follow it around and try to hear it about 5 times with no luck.

Any help would be HUGELY appreciated, its doing my head in!!!