Pulling to one side under braking. Possible causes? (Page 2/2) Yellow-88 JUL 29, 11:52 AM quote Originally posted by Yellow-88: Hi You said the car sat for awhile. Was it outside? Pistons or sliders can get stuck and rotors rust. Generally brakes may need a refreshment after sitting for a while. I should define what I mean by "refreshment". Even a brand new brake job left outside, unused will degrade over time. They don't get hot and then cold. No expansion and contraction to keep "tight" parts free. Nothing to keep the rust from forming on the rotors and maybe more on one side than the other. Yes proper brake grease is important as is brake fluid. The grease, if its the proper stuff will most likely be OK because it's pretty well sealed. If the sliders slide freely there OK but do take a carful look. The brake fluid will be absorbing moisture and with no heat to help drive it off, it will happen faster. Old brake fluid causes internal rust. Most likely yours hasn't caused damaged yet but it's good habit is to keep it fresh and dry. Brake "refreshment" is simply going through the rebuild process minus the new parts. You will need new brake fluid so sucking it out of the reservoir will give you room to retract all the caliper pistons. If the rotors are too rusted for sandpaper, visit your local auto machine shop. Yellow lives outside also. I've had to refresh his brakes a couple of times.