2005 Yaris won't start

[sceh]

Its a 1.1 l petrol. I stopped and when I tried to restart the starter won't turn over. Also the brake pedal seems very hard all of a sudden. I suspect a jammed starter solenoid so a welt with a hammer should do the trick but why the pedal being hard. The battery is almost new btw.
ANy clues welcome

Thanks

[sceh]

I suspect the brake sensor. I pushed the brake pedal really hard and it then engaged the starter. Does anyone know where the sensor is so I can check it?

thanks