Quote:
Originally Posted by FC Zach
This issue happened to mine once before as well as only one wheel engaging, I bled the calipers and had no further issues. It's been years since worked with this but I believe there were two bleed screws and I opened the upside-down one on the bottom, I remember that because it didn't make any sense to me.
Anyways I figured this all out after needlessly replacing a caliper that ended with the same results as before. Looked into it and it was too simple 
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I thought the parking brake was purely mechanical.
I never understood why the calipers have two bleed valves. Ironically, the passenger's side is the only one I attempted to bleed with the bottom valve out of curiosity. I still bled both rears with the top screw but hopefully it's coincidence that the passenger's side isn't working. I've probably bled the whole system 5 times now with a Motive pressure bleeder and the traditional 2-person method and no luck.