Pull a rear wheel and look at the pad thickness and the state of the wear sensor. There is only 1 wear sensor on the rear and I cannot remember if it is passenger or driver side. If you are down to only a couple mm of pad thickness, you probably want to change the pads before you end up wearing down to the metal pad backing a scoring the rotors (which then need to be replaced).
If you have at least 3mm of pad thickness on both inner and outer pads, you are probably in good shape for a bit.
If the wear sensor has come loose, it may have been rubbing the disc and worn down quickly, while the pads are fine.
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