Rear disc brake drag - HELP!

[jeffstar]

Hi, first post here

94 ES300

I hope someone can help me with this:

Right Rear disc bake is draging a bit. Accelerating after a full stop, I hear the right rear brake dragging a bit for a few seconds, then it quiets down. It sounds quite bad, almost like metal to metal.

I took it apart and everyting seemed okay, except the caliper slider was a bit sticky, cleaned and lubed the slider with anti-seize. Pads are about 50% worn. Rotors were replaced about 20,000km back and look okay not perfect, ever so slight ridge at outer diameter, where the pad does not touch Same thing, no improvement.

Thinking that the piston was perhaps not retracting as easily as it should, I changed the caliper and bled it , same thing!

Drive like that for 2 weeks, driving me crazy, pulled the wheel again, turned the rotor by hand, grind, grind pad against the rotor, more friction than I would expect. Slide the caliper up, rotate the rotor, still friction noise, but not nearly as bad, and easy to turn, fair bit of black dust (pad material) falls out of somewhere as I turn the rotor, keeps falling as I spin the rotor, more and more dust for a good 3 or 4 revolutions.

What the heck is going on???

[marc780]

1. check for crushed brake line, or worn out brake hose bulging

2. bad master cylinder?

[gtiguy915]

maybe the emergency brake shoes under the rear rotors?