hi, can any one help I have a st17 on a 03 every time I press the brake the front side lights come on and the dash lights flicker any one have a clue thanks

 

You've either got the wrong tail/brake light bulb fitted, or the bulb holder is all corroded up.

Change both the tail light bulbs for correct double filament ones and it'll cure it.

The flickering is quite common on ST170s, just turn the brightness of the dials down a bit and it shouldn't do it.