My kids Mazda MPV 4WD with rear wheel "ABS" has a low brake pedal. I took the master cyl off and stripped it down, washed it out, rubbers looked good, cylinder clean and smooth, re-assembled and began to bleed the brake system. I got no improvement in the brake pedal - still way too low.
Rear drums removed, shoes & hydraulics inspected, brakes adjusted manually to "just" rubbing. Front pads will need replacement sometime this summer, but still serviceable. No leaks in any of the cylinders or calipers. The right rear has no bleeder. It has a brake line going in and one going out to the left side. The rear brakes are in series with the right side feeding the left - and then a bleeder. Bleeding the rear brakes at the left, bleeds them both.
There is a bleeder on the "ABS" module that feeds both rear brake cyls.
I must be missing something really obvious, and I can't for the world of me think what. Before I go and strip everything down to nothing, I need someone with the "obvious" answer.
Thanks
Pete