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Another quick way to test for a sticking brake (or anything else that might be affecting your rolling resistance) is to notice if your car will start rolling on a slight slope. There are several red lights on my routes where there is just the slightest grade and while waiting for the light to change, I will check to see if the car will roll forward while in neutral or with the clutch pedal pressed in. What I am watching for is any change in the degree of roll. If I don't roll in locations where I used to roll, then I start looking for low tire presssure, dragging brakes, bad bearings, or anything else that might have increased the rolling drag somewhere in the car.
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