SOURCE: My 2004 Volvo S60--
I've seen this happen. the parking brake does NOT use rubber lines. it uses steel cables and is adjusted at the handle under the parking brake lever cover. if the small metal clip that attaches the expander to the cable brakes, get ready to open your wallet. what happens is the expander works its way out and the shoes catch on the inside of the rotor. then it becomes very hot as you're driving down the road, and it causes the anchor(part of the rear knuckle) to break off and destroys everything inside the rotor, often including the rotor. then the knuckle, that cable, hub bearing assembly, and rotor will need to be replaced.. which will cost you close to $1500 parts and labor..
That said, the parking brake adjuster works the same way as it does on most any other vehicle with a drum brake setup.
The parking bake adjuster works only when backing up. Sound like your may be getting stuck. The "hop" you feel may just be when the obstruction comes free/loose and fully release the emergency/parking brake
When it comes to poor parking brake operation, check for contaminated or excessively worn parking brake shoes.
I am surprise the dealer did not suggest this as a possible cause. Go back to dealer or find a reputable brake shop to check this out. Both rear wheels and rotors should be removed and the parking brakes inspected. This is a lot easier and cheaper fix than it will be if the problem is in the transmission (which it could be).
Please post a comment when you find out the true cause if this or something else so I can add this to my knowledge base. J
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