boiled off the oil in the calipers would be my first bet or they had enough water in em to steam up. when was the last brake fluid change..
Ive seen this on a hydraulic brakes fault finding vid but never IRL..
you may find the water that has turned to steam has now done one of 2 main things..
1. been absorbed back into the brake fuild (bad)
2. as it was steam its been forced out of the cylinders without leaving an obvious trace.. (also bad cause it means your brakes are shot)
the only other thing that comes to mind is if you had glazing on the pads and with the help of some dust/debries on the discs thats been sanded away restoring the brakes...
the only give away for that I can think of would be excessive scoring on the discs and pads and embedding of particulate matter on the leading edge of the pad tho this tends to happen more with drum brakes than discs.


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