[sfeakes]

If it's no tail lights or brake lights then it's not your break switch, it's more than lightley the bulb holders BDR use. pull all 4 lenses off, and make sure each bulb is snug, then try again and see if they work. With the wiring a loose bulb on the left side will effect the right side, so you need to check all 4.
If it is this, then search the forum, there are a number of fixes.