Brake Job 1998 Ford Ranger XLTV6 - 4.0L vin X 245ci

A buddy of mine went to back up one day in his Ranger and his rear left tire was leaking brake fluid heavily. We parked it, jacked it up, removed the wheel, and discovered the wheel cylinder was so heavily corroded it had basically just fallen apart.

The shoes and springs were all in similar condition, so I went ahead and purchased all new shoes, the spring kit, and pads for the front disks, as well as new bolts and pins for the calipers, new bolts for the brake lines, and new bleeders (the front calipers bleeder valves needed a desk mounted clamp to unscrew).

After replacing everything I bled the brakes, starting with the back right tire and moving my way closer to the master cylinder from furthest line to shortest and everything worked fine.

I went to start the car and the pressure was immediately lost. I’m not very sure why this has happened and any help would be greatly appreciated.

Side note: the car cannot go into P. The shift linkage is broken, and makes it impossible to access 1st and P. So it’s in N with the parking brake off when I bleed it.