I'll have to check on the E brake to see if it is releasing or not. However, that doesn't explain this: On a curve under 20 MPH sometimes I press the brake lightly and the right pass brake locks up for 30 - 40 feet and then releases when I let off the brake. It appears that 80% of the braking power is going to that one rear pass brake. Seems this could be caused by a bad Diff Sensor (described below) telling the ABS system that the rear axel is still turning, (when it isn't) so it sends it more pressurized brake fluid. That doesn't explain why the rear pass brake would be locked up and the rear driver brake would not- but that could be because of some other malfunction.
Sometimes it doesn't lock up when going around a curve.
When I drive any trip over 1/2 mile my E brake and ABS light come on at the same time and stay on until the key is turned off. This means the RABS valve isn't engaged and I have regular brakes on the rear, no ABS brakes on the rear.
The RABS brakes have a sensor (I'll call it the Diff Sensor) on the top of the rear differential that looks at a toothed ring to determine if the rear axle is turning. From my diagnosis I am thinking this could be bad. I have the shop manual for my truck but to go through all the diagnostics test would take many hours, and require several tools I don't have access too.
If I go to a professional the only thing I know for sure is that they will charge me another $200 - $300. I also know for sure that a few months later my brakes will be as bad as when I took it in. I am certain, someone knows how to fix them for good. Finding that someone is the hard part.
BigRedWeather