Can I bleed brakes old fashion way?

The dependable answer is no. Only with a scan tool can you trigger the opening of various valves in the actuator that are otherwise closed and create dead ends that cannot be bled.

If you're very sure the only air that entered the system is still localized back near the rear brakes, you might be able to succeed in bleeding air just from those lines, without a scan tool. That would be a specialized exception to the general rule. There's no guarantee you'll get away with it.

You can't do it by pumping the pedal with the battery disconnected. That only uses the fail-safe hydraulic system, which doesn't include the rear brakes. So the system has to be powered. When it is powered, with a steady pressure on the pedal, you don't have to pump; pressurized fluid will come out the bleeder as long as you have it open (or until the reservoir is drained and air is sucked in up front).

Without being in the bleed procedure or in invalid mode, though, that excess fluid flow is likely to trigger a trouble code that will leave that line valved off.

 

I've talked to several people who have successfully bled the brakes the old fashion way, even when replacing brake booster pump. But when I go down this rabbit hole I intend to use an Autel device's bleed procedure and if that doesn't do the final calibration I'll use Toyota Techstream on an old laptop.

 

If you had the rear disconnected at the beam? Fill the reservoir up I'm assuming you let it empty fill it up go to rest of car wait for fluid to come it is coming. Wen it do spin one caliper on bleeder open rt side . Go left add caliper close it's bleeder . Let rt side drip 20 minutes . Close same on left side . Whaddya ya got? No pumping .