Your original brake line routing likely routed the front hard line up the driver side rail, dropped a take off to the driver side brake cylinders, and continues across the front of the bib, over and back to the passenger brake cylinders.
My 73 with drum brakes all around, had a duplex master cylinder. The front hard brake line drops down to the driver side rail and terminates in the clip shown above, and then a flex hose connects to a tee on the axle. The rigid line on the axle travels to both wheels, and short flex hoses connect to piping feeding the wheel cylinders in the front brakes. The second hard line to the rear brakes travels across the firewall, drops down to a 90 degree fitting bolted to the passenger rail, and a hard line goes from the fitting along the passenger rail to a flex hose connected to a tee on the rear axle.
Later FJ40 models have both front and rear brake lines travelling across the firewall to the passenger rail, and then connecting to the welded fitting shown above. Here again, the rear line supply is connected to the rear tee and goes back along the passenger rail. The front hard line connects to the front tee and travels forward to the clip shown above, then connected to a flex hose routed to the front axle.
I suppose you could adopt either of the latter two arrangements above. Length of hoses is dependent upon lift, axle travel and turning radius.
1973 Location of 90 degree elbow supplying rear brake hard line: (This is where
@cruisermatt double 90 elbow fitting would attach if you ran both front and rear brake lines along the firewall.)
View attachment 3757991
Front brake hard line on driver's side showing bracket to flex hose. This is the OEM arrangement.
