To whom it may concern, I’ve been trying everything I know to get a good brake pedal. I replaced all 4 brake calipers because the RF caliper and RR caliper were frozen. I started going through front rotors, in my opinion they were getting too hot and warping and my brake pedal was not the same any more. The front rotors are doing all the stopping unless I pump the pedal once before actually making my stop.  I bled the calipers more than just a few times. I replaced the master cylinder, still the same thing. I bleed the brakes while the engine is running.  I tried a pressure bleeder mounted the master cylinder with 10 PSI the fluid would not push through the master cylinder or the ABS controller, so I gave that up. In the mornings when I’m going to work, I back out of my driveway and if I don’t pump the brake pedal when I shift into drive I can hear the rear rotors rotating inside the brake pads until the rear differential takes up the slack in the gears.  That’s how I realized the rear calipers are not clamping down on the rotors as they should.  I’ll bleed the rear brakes and I’ll have a decent pedal for a day or so and it goes right back to the same old pumping pedal again.  What am I doing wrong.  I’ve never had an issue like this before.  I’ve been working on the cars and big trucks since 1971.  This is my first ABS system I’ve ever had an issue with.  Thanking you in advance,

Anthony

2010 Toyota Tundra