Disclaimer: I do not know what the legalities of this mod are in the UK and in other countries. Please ensure that this does not violate any local laws before following this guide.
The 5-brake mod is as it says on the tin, a pretty simple wiring mod to light up the rear fog lights simultaneously with the brake lights, as well as allowing you to selectively use both rear fogs independantly when needed in foggy conditions. A simple switch allows you to turn off the mod when desired.
I’ve noticed that there are a few 5-brake light mods on US forums for various VAG vehicles. Most seem to be rather complicated but one fairly simple approach which I adopted for the Fabia vRS seems to work really well.
You need both rear fog lamps to be active, which on the Fabia is a simple matter of running a jumper wire 14-16 gauge from the empty terminal of the left hand side rear light cluster under the rear trim to the live corresponding right.
Fog bulb, bulb holder etc are already in place from the factory but there's no actual powered wire present!!! (There are threads on Briskoda on how to do this and you can use a Scotchlok connector on the relevant grey-white rear fog wire to join the powered rear fog to the opposite un-powered one) If you look at the small dark rear light cluster connectors, you'll notice that there is an empty "slot" on the Left side one (RHD vehicle). All you do is run a suitable single wire scotchlok-tapped into the corresponding powered side under the rear trim, strip the bare end, insert into the empty slot and then bend it into a little ball from the other side. A little solder applied to the end before insertion helps to make it stiffer and prevent any corrosion. It's not elegant but works well plus it saves trying to find the crimp-on mini terminal end from VAG.
To do this mod we use two magic items called diodes. These act like an electrical one-way valve, allowing current to flow in one direction easily but not in the other.
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[FONT=Times New Roman][SIZE=3][COLOR=#000000]Radio Shack part no. 276-1144 contains the 2 diodes you’ll need, cost me the equivalent of