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Turn signals have a relay it is called a flasher. Brake light have a switch which is usually at the top of the brake pedal. Should only have 1 fuse per circuit. Have you checked the fuse panel for power to and thru the fuses for the signals and brake lights? Have you checked for power at the flasher and at the lights themselves? You need to do those steps first and you should be able to find the issue.
Remove the brakelight bulb holder, If you pop out the entire assembly it will save your knucles some skin. Then you want to take some fine sandpaper and clean the contacts "on the housing" well, and coat the with a thin film of dielctric grease or vaseline. I'm sure this will resolve your problem. I've had to do this to numerous Volvo vehicles over the years. Also once you're finished, the dash indicator may "not" go out unless you purchase the bulbs from Hella because of their candlepower exclusivity.
Well, have you checked the fuse? Maybe stick another one (of the same size) in there anyway. If that's ok, then check the stop light switch. It'll be somewhere along the brake pedal linkage/ arm under the dash or under the hood around the linkage or master cylinder. Look around. You can short across the wires temporarily to see if they light up and then you'll know if that's it.
I am working on my 85 DL right now and got a few surprises when I went behind the dash - someone had been there before and moved a few things. I've owned the car for 21 years so it happened quite a while ago. I pulled my instrument cluster out along with the headlight switch. I suggest that you pull the headlight switch, ( a screwdriver removes the cover, after you've pulled the switch knob off with a good, steady tug on it.) Check for a loose connection. I found that Volvo and Haynes can't agree on the location of the relays so get a part number from the dealer for the headlight relay and then get started looking under the dash, especially under the middle A/C vents for the one you seek. I also found one hidden on the driver's side at the bottom of the center pedestal. It's black if that helps any.