Expert: autohelp - 3/22/2009

Question
LF brake does not release completely after letting up on pedal. I've replaced both calipers, pads, rotors front, wheel cylinders in the rear. Master cylinder too. It is a 4 line Master & I did bleed it on the vehicle using brake pedal, two lines at a time. Brakes hold good, but LF does not always return, I feel it holding and it gets hot.

Answer
The most critical part of the brake system of which you did not change is the rubber brake hoses going to each wheel  as they tend to collapse internally and when you put your foot on the brake pedal you are able to push fluid thru the rubber hose due to the pressure of the fluid.

Unfortunately there is no pressure that returns the fluid to the master cylinder and the fluid cannot pass back thru the rubber hose.