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The turn signal switch disconnects the brake lamp from the side that needs to flash. Are both brake lamps out when the turn signal is actuated?
First suspect cause is turn signal switch, but need more information.
Bad or disconnected flasher.
Be sure the black wire at the flasher is powered up with the key-on. If not, check radio fuse and at the radio where the black and red wires are connected in one terminal.
On a'71-74, If the dash harness power connector for radio is cut off and and the two wires (red & black) are not spliced back together, you will loose power to the turn signals.