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That sounds so .. horribly simplistic & basic! Probably more reliable than the electronic type ... on my old Alfa the wires to the pad sensors fell out after a couple of months! They weren't cheap pads either (they were a good brand as when I use the brakes I want to stop!) I super-glued them back in the holes in the pads to stop them flopping around but doubt they would work. I just had to check them more often visually.

The said 2014 car has the original valve springs fitted, it seems it was just a batch of springs made to the same part number that was to fault and this was fitted to 2012/2013 cars,. Toyota have now superseded the valve spring part number for the earlier cars to a later part number that is used on re-call work. I haven't had a reply to my question from my Parts supply if the original part number for 2012/2013 cars is the same as this 2014 car but I am expecting it is. Not all cars have had this valve spring issue but the 2014 is the 1st car I had actually seen a broken valve spring for myself. Car would misfire at idle , compressions all good, valve clearances all good but the valve with the broken spring felt soft due to 1 coil be broken at the top of the valve spring