I replaced front discs and pads a few thousand ago ( no warning lights at that stage ) and ive just had the BP warning light coming on /going off through a journey.

Appears to be one warning sensor per axle .

rear one appears to have been unplugged and taped up by a previous owner but for the purposes of elimination ive completely unplugged the cable for now from the box under the rear inner wing .

Ive also completely unplugged the front cable from the black junction box as well.

Ive still got the warning light so I'm assuming ive got a short further up the line somewhere? any ideas?

ive tried searching available topics on here but all are about changing the pads , which ive now eliminated

Brake Pad sensor works on a completed loop, if you've unplugged parts the loop is broken so you will need to wire the system so that it has a complete loop

ah ok thanks , I thought the sensors was activated on a earth through the wire to the disc , if its a open circuit activation I will close both loops and I should be good, thanks

If it's anything like BMW.there is a resistor in the sensor and the ecu will only turn the light off if it sees a new sensor (different resistance) on the end of it,so a sensor change may be needed even if the pad wear has not got that low
But it may be different on a ff ,just a thought

don't think its that Iron horse because I changed the front and kept the original sensor and I was ok for a few thousand , I'm sure its the back one that was disconnected and taped up, probably an open circuit under the tape

Just get a new sensor they are less than £20, and are plug and play.  There is nothing that can't be fixed with a hammer😜😜
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When I replaced the rear pads the sensor was cracked at the elbow of the pad insert, I successfully broke it, and had a rear bad warning, bought a new rear lead from LR, fitted it and after a couple of minutes, the warning reset itself was @£20 for gen LR Regards
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viper wrote:

don't think its that Iron horse because I changed the front and kept the original sensor and I was ok for a few thousand , I'm sure its the back one that was disconnected and taped up, probably an open circuit under the tape