Despite replacing componens, I still have what seems to be a bit of pad drag (very intermittent, comes and goes). Should I suspect a sticky caliper piston?
[Response: Gene Stevens] Jack up the car and take the wheels off. Have an assistant push the brake pedal down firmly while you carefully watch the piston when the pedal is released. By design, it is the soft piston seal reforming itself to a square cross section that draws the piston back slightly. It does not take much interference to keep that from happening. Remember, there are no return springs on a disc brake. A bad caliper will not “walk” back and forth with pedal pressure. (FYI, it is the piston finding its position on the pressure seal, and taking in fluid when the pads wear, that make disc brakes self-adjusting.) The NUMBER ONE reason for piston drag is moisture getting behind the dust seal, collecting at the bottom, and causing a slight buildup of rust on the land between the dust seal and the pressure seal. The rust actually touches the piston and keeps it from free movement. These seals are usually damaged DURING service (carelessness when sliding the caliper over the pads
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