The cables have a ptfe or similar liner & are not designed to be lubed, but a thin oil works. Undo the support forward of the caliper to get the cable-end down low to encourage flow.  Start with a wd40-type with a straw. Then 3in1 oil or similar. First time I did it was 2019, the cable needed gripped with pliers to move. I've lubed it again since, and it still works.

I have high parasitic current on my car too. I have to disconnect the battery if I don't drive the car for a few days. Will check this out

Thanks for the replies. I've ordered a new rear-right caliper off Ebay, wasn't too expensive - hopefully it will fit fine. The rear-left caliper looks like it was replaced, while the rear-right looks original. What type/brand of lube would you recommend for the handbrake cable? I'm Hoping I won't need to change the whole cable lol

Quote from: Alex Knight on Today at 09:06For which turbo?

This:
https://www.tboturbo.com/en/h-pd-289.html?fromColId=0#pfc=%7B%22groupIds%22%3A%5B129%5D%2C%22mul%22%3Atrue%2C%22nvMid%22%3A472%2C%22lid%22%3A1%2C%22sc%22%3A%7B%22key%22%3A%22name%22%2C%22desc%22%3Afalse%7D%7D&_pp=0_472_129

@Dagnet
Here is a link to the How To do a "Full rear caliper strip down and repair. Hand brake issue".
It is very clear and comprehensive. But be aware that you will need some tools, that you may not have, that will cause the cost of the exercise to be increased somewhat above the cost of the replacement parts.
It is worth reading just to get an understanding of what is/ supposed to be happening when the handbrake is applied.

Quick on the draw @Ardent beat me to it!

As above.

I looked at rebuilding refurbishing a set of calipers.

 By time I had factored in the tools I would need to buy to complete the project.
Was not cost effective for me.
I just bought pair in the end.

For which turbo?

It sounds to me that the piston is somewhat seized and the cable is stiff.  As recommended you can free the cable with light lube from the top, working it in and out as you go.  Replacing cables is a big job, as you have to lower the tank.  If you do decide to replace, OEM is highly recommended.  Some of the aftermarket ones just don't fit properly.

Rebuild kits for the calipers are available and inexpensive if you want to have a go yourself.  If not, decent aftermarket calipers are also plentiful and quite inexpensive.  If you go that route, I'd recommend doing both sides.

Get some good silicon based grease (such as 'Ceratec') to lubricate the sliders after you've cleaned them up.

There's loads of info on brakes in our 'how to' section.

Sorry. I've just realised that the second pic is from your Celica! D'oh!

To do list:
Sort out bend of charge coolant pipe where it gets thin.
Source new 10psi wastegate actuator
Rework wastegate hose to go direct to turbo
Remove old o2 sensor (x3) wiring and replace with bungs
Refit under trays
Get it through an mot
Work on oil drain leak.. more.
Return current ecu for new one in 2 weeks time.
Buy new tyres (AD08)
Enjoy it