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EDIT I cleaned this up to make it easier to understand, just 4 easy steps!!! Unless one is trained in electrical/electronic troubleshooting is is FAR better to focus on one issue at a time, then many times as you figure out one issue other issues go away, so lets start with just the brake...

The last person that replaced a bunch of stuff trying to troubleshoot an issue messed up on one of the connectors on a known good part so he chased his tail for quite a while. ACTUALLY troubleshooting the issue to the ACTUAL bad component will give you a MUCH better understanding of your system...

Turn signal flasher is OK if the turn signals work

Yes that could be your service drive (tail light) issue

Then the brake light switched power (brakes applied) goes back out of the light switch on pin C wire 22A it then goes into the turn signal switch on pin D still wire 22A At that point if the turn signals are working and the turn signal switch is in the neutral position the brake lights must work...

First things first, do you have power to the brake light switch when in service brake or service drive on the light switch? Actually it would probably be easier to drop the light switch out so you can look at the connections on the rear. service brake power comes out of pin A wire 75A then when...

Time to get out the schematic and start troubleshooting your issue, the power to the light switch powers the turn signals so that part you know is working. other than that you need to just start tracing out the wires with a volt meter or test light (test light is much easier to deal with) just...