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https://youtu.be/OOP8e6DjGm8
(no brakes being applied in the video, car is off and rolling down driveway)

Car started making this sound a few days out of nowhere. Happens only when the car is moving in reverse (whether on or off).

Seems a bit too loud for it to be the e-brake "semi-engaged," isn't it?
 

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https://youtu.be/OOP8e6DjGm8
(no brakes being applied in the video, car is off and rolling down driveway)

Car started making this sound a few days out of nowhere. Happens only when the car is moving in reverse (whether on or off).

Seems a bit too loud for it to be the e-brake "semi-engaged," isn't it?
Jack the rear of the vehicle up, do the rear wheels turn freely? If yes, then the e-brake is not binding; if no then the e-brake could be binding or the caliper may be seized; the caliper can seize internally (usually caused by the piston rusting at the pad end and seizing in the bore) or the caliper can seize externally (where the caliper body has seized on the pins and is no longer able to slide freely). However, this could just be the pads vibrating, in which case it sounds a lot worse than it is. But, it is annoying so needs to be sorted.

Start by removing the rear calipers (no need to disconnect the brake hose).
Check that the disc and/or pads don't simply need replacing.
http://media.honda.co.uk/car/owner/media/manuals/PreludeManual/62sf100/13-29.pdf

Clean up any rust and ensure the caliper body moves freely on the pins. If the pins are rusty and pitted, you can clean them up on a wire wheel or with some fine emery cloth (or fit new pins). Also clean inside the bore that slides over the pins (roll up some fine emery cloth or wrap some emery cloth around a screwdriver and slide it in and out of the bore). When reassembling, put a smear of copper grease on each pin and in each bore. Also, smear copper grease on the rear face of each pad and both sides of each shim (this slows down the rusting process and helps to damp down vibration).
http://media.honda.co.uk/car/owner/media/manuals/PreludeManual/62sf100/13-28.pdf

A couple of examples of copper grease, there are lots of others.
Copaslip
http://www.molyslip.co.uk/copaslip.php
Carlube copper grease
http://www.carlube.co.uk/greases/carlube-copper-anti-seize-grease



Hopefully, a simple strip, clean, grease and assemble will sort the problem. If the rear calipers are seized internally, the easiest thing to do is get exchange items from a motor factor. But, if you fancy having a go at them yourself, caliper info. is below.

Rear caliper diasassembly
http://media.honda.co.uk/car/owner/media/manuals/PreludeManual/62sf100/13-31.pdf

Rear caliper reassembly
http://media.honda.co.uk/car/owner/media/manuals/PreludeManual/62sf100/13-34.pdf
 
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