c1391 with no other codes

I'm not understanding why you're parking brake is acting up that should have nothing to do with anything to do with the braking system wants the parking brake is removed It not setting is a problem The little piece of plastic or whatever holes it down so you can push it again to bring it back up is not clicking or sticking like it's supposed to that should have no effect on the rest of your brakes I wouldn't think It is a mechanical parking brake so I would probably rule that out I haven't used my parking brake except to push it down to bleed after installing a new actuator assembly usually on the generation to the brake foo bar mess is to do with your actuator generally It is possible some other part could be going haywire like if there's a computer that runs the brakes the body control module something along those lines haven't looked in the manual enough to know usually you're just replacing the actuator here it looks like you may have a little more troubleshooting to do I've never had any of the amber lights flashing including the exclamation point ABS and or VSC they don't flash mine just come on and stay forever until the actuators changed and the linear valve offset can be calibrated and all of that till that happens those white stay on so far in the two models that I have here and dealt with this problem.

 

Yes. Because of the way the parts are split up in gen 2, the actuator assembly is pretty much one-stop shopping for this issue. It isn't like gen 3 where the pump/accumulator and actuator are different assemblies and you have to figure out which to replace. In gen 2 it's easy.

Your parking brake issue is unrelated. That's purely a mechanical pedal, cable, and ratchet. The ratchet is supposed to grab the first time you press the pedal, and release when you press it again. In very cold weather, the grease on it is slow to move, and the ratchet won't grab instantly. Pressing the pedal down and holding it for a moment usually works for me, gives the cold-greasy-ratchet time to ease into place. Depending on where you are and how cold it gets, you might have to hold it longer than I do.

 

Quite unlikely to be anything outside that unit itself. Clearly you have an internal leak: an external leak that big would have emptied your fluid reservoir and made a lake on the ground by now.

There aren't a lot of places outside the actuator where an internal leak could be, as a lot of the lines coming from it are dead ends.