The third or High Mounted Brake Light runs straight off the brake light switch on the brake pedal arm. You say you tested the "brake unit"? I assume you mean the third brake light assembly, and if you get power there when someone steps on the brake pedal, then the bulbs are bad.
The power flow for the brake lights goes like this: Fuse ->Brake switch -> Turn signal switch -> Rear lights. The only difference is, if you have a 3rd brake light in your rear window, that gets its power directly from the brake switch. It does not go thru the signal switch first. So, if you are having a brake light problem, and your fuses are good, check the 3rd light in the rear window, if it lights up (assuming the bulbs are good, no one ever changes them), then the problem is most likely in the turn signal switch, hope this helps!
Have you checked the socket (Where the bulb is inserted in)? Corroded/burnt contacts will not make a good connection. Fuses and wiring all good? If you know your bulbs are good and the sockets are ok, check the fuse. It might have blown when the bulb went out. And lastly, even a turn signal bulb may cause a brake light to go out.
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