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I believe that the lights on the dash, and your non-functioning parking brake are NOT related. Just coincidence.
The 3 lights on your dash, that come and go, usually mean one or more of your wheel speed sensors are either gunked up, or on their way out, and need to be replaced.
Seach "wheel speed sensor", and you will see where they are, and how easy it is to pull them out, give them a quick clean, and reinstall. If the lights come on again, get the codes read, and they will be able to tell you exactly which one is faulty.
For you parking break issue, try tightenting the adjustment screws on the underside of your parking brake handle. If that doesn't work, you may need new parking brake shoes.
Good luck
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