In the process of removing the existing parking brake cables to replace them, removed the front already and that went fairly easily. However, the rear driver's side cable is proving difficult… there is a 3-pronged cable clip anchored into the frame right near the adjuster that only seems to be accessible from a little hole up on the side in the wheel well. I can't even see the clip, much less the tangs that need to be depressed to remove it.
Can't even get a tool in there to depress them! How do you remove this clip?

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My Fiero: 1986 Pontiac Fiero GT, V6, 4-speed manual

Small hole in frame allow you to break off lock tabs. Just use flat screwdriver.

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

Wasn't able to make any progress with the screwdriver, but after wrenching around on the outer portion of the clip with vise grips I was able to wiggle it enough to bust the tabs and yank it through.