I took the car out for a wash. After 20mims driving. The lights came on when I applied the brakes. I switched the engine off. Great, no more lights. But as soon as I applied the brakes. The lights are on again.   I did put a heavy luggage in the boot, maybe that upset the sensor? I also topped up the windscreen fluid and it overflow a little bit.   Tried resetting the ECU. Didn't help. Any ideas? Im 250miles away from home. Hope it doesn't cause any problems?