Can dirty brake fluid cause the caliper to not release?
I have a problem with the front brakes on my 03 Mustang. 45,000 miles. A little history. The gas mileage had made a drastic drop, so I started looking for reasons for the drop. I found the driver side front wheel hard to turn when the car was jacked up. I found the front caliper frozen and it would not release the pressure on the rotor. I replaced the caliper and brake shoes and hose and all was good for a few months. I have noticed a slight drop in gas mileage so I jacked the car up and found the wheel hard to turn again. I removed the wheel and checked the caliper. It is not frozen this time. All looks good. The rotor turns free with out the caliper on. The only thing I noticed is the brake fluid is not as clean as it is right from the bottle. It has never been replaced. Could dirty brake fluid keep the brake pads from releasing so they do not drag on the rotor?