Then remove the old torsion-bar assembly. Scrape away any remaining caulk. Nail in the top piece first. Drive nails into the jamb and bend them over the panels for support. With all door panels in place and level, join the panels with the hinges and install the top and bottom brackets.
Slide rollers into each hinge and bracket along the sides of the door.
The vertical track fits over these rollers. Set one track, then measure its position to place the other. Install the horizontal tracks above the vertical tracks. Lag screw each angle bracket to the jamb framing. Bolt the back of the horizontal track to a hanging bracket.