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Actually, I always thought you were supposed to bleed the brakes from the master cylinder-outward, starting with the closest bleeder valve and ending with the furthest away...
Ohh and make sure the fluid follower is in the resivourso air doesn't get in the lines during rough rides
I always heard that the disc caliper has to have residue pressure to maintain the pad on the rotor. The drum situation doesn't as there are springs/arms which pull the shoes off the drum. There is some type of valve in the master's output where the line connects. It's suppose to keep the residue pressure intack
The proportioning valve works the pressures between the front and rear lines. Sort of like the 'H' pipe in an exhaust.
when I had my toyota with discs all around I had a similar problem. The calipers are solid mounted due to the 4 pistons. I had a combination of slightly warped rotors and worn rear wheel bearings allowing some slop.When I would go wheelin or lots of corners the axles/spindles would walk side to side and push the pistons in. I would have to pump the brakes to get solid pedal feel. I installed a 2lb. residual valve to the rear and it solved my problem.