The brake light malfunction may be in the brake relay which should be located in the fuse block and it may also be the problem with the running lights. If the brake relay is OK then check the brake light switch in the switch housing. I would think that brake switch is not working right because the brake light works when you use the back brake.
The running light problem may be a ground problem so check and clean all the ground connections you can find that is related to the lighting, if it is a bad ground it may correct the brake light problem too.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.