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The reason why your dash dims is because your brake light is causing one of the tail lights to come on. i.e. when lights are on, dash illumination is lower.
I suspect that your rear stop light bulbs are dual filament with your rear tail lights. It is a common problem with dual filament bulbs.
Either figure out which one is causing the problem by removing them one at a time, or replace both as they are very cheap.
If it is not the above (which I will be very surprised if it isn't) then you may have an earth problem. Change the bulbs first though before worrying about this!
Currently in martin999's garage:
2011 (11) VW Passat 2.0 TDi SE + options in Island Grey, 2011 (11) Honda CB1000R in Pearl Cool White... oh and a 2004 (54) Secnic II 1.5dCi Dynamique in Ottoman Blue !