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I had already installed new e-brake adjusters, strung new rear and intermediate cables, tried multiple adjustments and made no progress before bring it over for the mechanic to deal with.Just another point to consider. I was parking my Tahoe on a steep hill and really stood on the parking brake. Something went pop and my foot went to the floor. No parking brake. In East Tennessee!
Eventually I took the rear brakes apart and couldn't see anything. I looked at the pedal mechanism. Nothing. The cables were all intact. I thought. Finally started squeezing my way along the rubber sleeve that protects the cable directly under the driver seat area. There was a soft spot! I pulled on the cable and found out it had corroded inside the sleeve.
Parking brake still sucks because it's so hard to adjust.