I just completed a front brake job on a 2007 Dodge Grand Caravan, installing new rotors and pads. Right front rotor and pad installation went perfectly. Left front - I heard a faint “hiss” as I compressed the caliper piston using a c clamp. In addition, as I placed the new inner pad against the caliper/piston, I noticed that the piston had become slightly “uncompressed,” meaning it moved back out a little bit on its own. I compressed it again with a c clamp and had to rush to get the caliper back in place with the new pads in place before the piston SLOWLY worked itself back out and I wouldn’t be able to fit the caliper around the new rotors and pads. I completed the brake job, pumped the brakes, and took it for a ride - all seems fine. The pedal is not spongy and it does not travel all the way to the floor.
Do I have anything to worry about? This is my 6th brake job in total. This is my first brake job on this vehicle. The slight hiss and the fact that the caliper piston did not stay seated after I compressed it bothers me.
Thanks for your help.