One of my rear brake pads is way more worn out than all the others.
I only started hearing the scraping sound while braking a few days ago. When I took out the caliper I noticed the cylinder of the worn out pad was a bit harder to compress than the other one. I was able to turn the wheel but I would hear the brakes scrape the surface of the rotor very slightly but it was not "stuck", the wheel was turning. I bled that side a little bit and the color of the fluid was a very light yellow without apparent particles in the fluid. I have those rotating pistons on the rear brakes which I am able to pivot while pushing a longnose plier in the grooves and rotating it. I am concerned that the side with the worn out pads is harder to push. If I want to completely clean out or even replace that piston , how would I proceed? I bleed the brake fluids out, take out the hose, disconnect the handbrake line and rotate the piston until it comes out ? Also wondering if it would be that, sometimes, when I use the handbrake, if it does not makes that piston stick to the pads but I am unsure how this system works. Can anyone explain how and what you think the problem is and how I should tackle this intelligently.