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From your description you dont seem to have had any actual evidence that the brakes were at fault before replacing all 4 calipers, and since that replacement didn't change things, that tends to contraindicate brake involvement, though it remains a possibility. .
There could be other reasons for "falling fuel consumption" (by which I assume you mean "rising fuel consumption" since that is what dragging brakes would cause}, probably involving the engine, such as a misfire or a vacuum leak.
An OBD2 scanner might give some error code stylee clues, though by most accounts they are likely to be rather Delphic ones.
I have no experience with modern engine diagnostics and wouldn't much want any. On my sort of simple car I'd probably check valve clearances, ignition timing, do a compression check, and have a look at the plugs.
You might be able to detect brake dragging by jacking up each corner and seeeing how freely the wheel goes round. If you buy or borrow an IR thermometer (not expensive) you could perhaps tell if one hub got hot after a drive.
You could get brake dragging because a disk was out of alignment, perhaps because of rust on the seating surface, or a hub bearing going bad.
tw.forumosa.com/t/old-black-hands-checking-in-agai...d
It could also be that one of your brake hoses has collapsed internally and is acting as a non-return valve, keeping the pad applied for some time after you release the brake pedal. This could be tested via the brake bleeder, using a syringe bi-directionally, though ABS (which I have no experience of either) might complicate this.
Edited by edlithgow on 08/10/2024 at 09:42
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