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NOTE: After servicing the rear brake pads or calipers, or the rear brake shoe, loosen the parking brake adjusting nut, start the engine, and depress the brake pedal several times to set the self-adjusting brake before adjusting the parking brake.
I'm a big fan of not dicking around with things until everything is setup.
I'd wait until you charge the system. Although, I don't think it'll make a difference with the problem you've described.