Help with rotor getting very hot on the rear left side.
I checked the rotor and it was unbearably hot, could not touch it.
I had the truck up for inspection the month before and it got new rotors and pads and a new caliper on the right side. But I didnt drive the truck since then until I took it to put the winter tires.
I am leaning that I should replace the caliper but the evidence confuses me on that.
The rotor does not show any wear, there is a stamp of the pads in it because I didnt drive the truck for weeks.
The pads show no wear either.
Heres what I did so far:
The wheel is not stuck, it doesn't particularly feel sticky, because its an awd it doesn't rotate freely.
I took the caliper and pads and rotor out and checked that the parking brake shoes do not show any signs of wear or that thet rubbed anything recently. Checked the parking brake line and it moves with no restriction.
Checked the bearing and there is no give, there is no sound, there is no rattling so I crossed it off as well.
The pads they are not sticky they move freely in their encasing but just to make sure I cleaned it up, used a file to clean any rust I could see and put copper anti seize. I noticed however on the inside pads in the grease that it had a bit of brake dust;
One of the caliper pins was stiffer than the other, so I took them out and cleaned them and didnt see any signs of rust. Put fresh silicone paste on them and checked that it moves easily.
The caliper piston, I used a c-clamp to push the piston and there was not much resistance for it go in or was it locked but I did notice that while I was working on the other parts the piston eventually uncompressed because when I went to put it back in I had to compress it again with the c-clamp to fit it in the pads.
Finally I bled the line for any possible air bubbles or blockage and the fluid gushed with no restrictions or bubbles.
My test drive consisted to drive the truck down the road for 2-4 kms without using the brakes and using inertia to bring it to a stop and then putting it into park.
At that point would do a check and the right rotor was cold as well the caliper and pads, the left side the rotor was slightly warm, but the caliper felt cold.
Then on the way back home I brake hard a couple times to use the brakes.
The left rotor side is impossible to touch compared to the right side.
So here is my theory based on my observations but because I am not a professional mechanic perhaps someone else has had this experience and can confirm that its the caliper.
For some reason the piston uncompresses (pulls out) enough that it makes the pad rub on the rotor, it doesn't push it hard enough to make it stick. so that friction between the pad and the rotor is enough to heat it up.
Does this sound plausible and I replace the caliper or do you suggest something else to look at?
I just want to make sure before I buy a new caliper that I am on the right track.