Hi Sam
Giving your rear brake problem some thought.
Are you using the used calipers from the donor car & have you changed the pads n discs ?
The sympom you describe is consitent with a partialy siezed caliper piston, this will bind badly when things start to heat up, releasing again when the caliper cools down again.
In my personal experience, older calipers that have been run for a long time with low friction pad material ( Or have been laid up for a long time ) are often a problem when new pads are fitted.
Moisture can & will find it's way past the pistons outer dust seal, this creates a layer of rust or crud on the surface of the piston.
Fine whilst it is still running on the same pads but the moment the piston is pushed back in to allow fitment of the new thicker pads, the crusty surface of the piston gets pushed past the calipers inner seal & tends to bind ( Getting worse with harsh braking )
If this issue persists, perhaps you should consider a new caliper seal kit, personaly, I would inspect the pistons condition first, if damaged by rust it would probably be almost as cheap to buy refurb calipers .
I hope this make some sense.
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