My break lights wom't work on my peugeot 306 help?

The engine management light was on in my peugeout 306 hdi merdian 2.0 i got it checked and it came up with fault code p0903 which its clutch actualtor reading to high. got this switched off. Day after my break lights were sticking on and had to keep my food under the break pedal to keep them off, now my break lights won't work at all can you please help what could this be?