Rear brake binding after caliper change

[SwaitsySG]

Rear brake binding after caliper change

Afternoon all. Think anyone could shed some light on this?
So more often than not, but not all the time the nearside rear brake seems to stick, causing the wheel to heat up and the pads to smell.

I'd initially changed the pads, cleaned the slider pins, filed the caliper carrier to clean it, and replaced the pad shims. I also added a thin smear of anti seize grease to the backs of the pads. No change. I've now changed the caliper, so that's brand new. Still no change.

I might add at this point there's no squeaks or squeals, no fault codes for the braking system, no issues at the pedal end, no dash warning lights and the EPB appears to be functioning as it should. There was also no issues during the mot test, which the car passed two weeks ago.

Any suggestions folks?

[Magnet]

Possible starting-to-break-up-inside flexible hose??

[SwaitsySG]

Not something I'd considered, but it's possible. How firm should the flexi-hoses be? 

[Magnet]

Thanks, - not sure I’m understanding the significance. Simply change it as a process of elimination. 
Kind regards,

Gareth. 

[SwaitsySG]

For the sake of opinion. Cheers.

[Magnet]

Still not sure of the significance, but…