• Does the brake pads move with very little resistance?
• Does the guide pins move with very little resistance?
• Does pushing in the caliper move with little resistance?
• Does the wheel spin freely while up in the air?

 

• Does the brake pads move with very little resistance? Yes, I took pad out no problem and re lube hardware
• Does the guide pins move with very little resistance? Yes
• Does pushing in the caliper move with little resistance? I forgot to push the caliper when I had it off.

• Does the wheel spin freely while up in the air? At least when I let off brake, car rolling forward without gas when in drive.

• Does the brake pads move with very little resistance? Yes, I took pad out no problem and re lube hardware
• Does the guide pins move with very little resistance? Yes
• Does pushing in the caliper move with little resistance? I forgot to push the caliper when I had it off.

• Does the wheel spin freely while up in the air? At least when I let off brake, car rolling forward without gas when in drive.

 

A sticky caliper will have more resistance when turning by hand.

Try bleeding the brakes to see if this helps

 

100% right. If it doesn't help and you have not been bleeding your brakes, moisture may have built up and caused a sticky caliper. You would then have to either rebuild them or purchase new or rebuilt calipers for the front.

 

Were you driving in a circle? The outside wheel would be spinning faster and get hotter.

 

Nah, mainly high way

 

I'd retest it. It's possible that it's like that because of the driving conditions

 

My guess is a sticky caliper or possible wheel bearing, had an interesting example;

03 Vibe, brake pad 'tabs' at each end was too long and had to file down so it would fit. Symptom was brakes where real grabby and then smoothed out after. Dealership mechanic had also signed off on the brakes being checked, not sure what his inspection was, but it definitely wasn't thorough...

Rock Auto has decent pricing on coated calipers, but there is a core charge until they get your return. After draining the fluid I also put it into a gallon zip-lock bag with a rag to soak up any residual drips, and back into the packaging they send out to be sure it gets returned with no leak problem, the core charge is steep enough to warrant the extra effort.

 

Your caliper "may" be sticking a little, but that's what happens to them as they get gummed up inside from years of use. IF you already checked your pads and slider pins, then yeah the caliper may be on the way out of it gets hotter than the other side. I would try removing the caliper and working the piston in and out fully and then try it again. One thing to look at when you have the caliper removed is to peel back the rubber covering the piston. It's probably full of rusty crap in there. Happened to me before I changed mine. No need to disconnect the brake lines either to do this......good luck.

 

I use IR thermometer to measure both front side rotors temp after couple miles driving. I see left side is about 60c(140 f) , while right side is about 45c(113f). I already clean and relube the break pads and guide pin. But it is not helping.

Is such difference normal or its just my OCD kicked in?

I think you got enough advice on the possibilities and things to try out. I just wanted to chime in that it is not normal for any temp difference between the two sides. My experience in another thread (I know you have already lubed the pins) -

On a lark I aimed an infrared thermometer at the rotor immediately after coming home once and found that passenger side at about 195F and drivers side at 172F. Pulled both the calipers out and lubed the caliper pins. The passenger side pads looked a little thinner than the drivers side, thinking back. After a test ride both came in at same temp.

 

Thanks for the input. I just finished brake fluid bleeding for both front sides, and went for a test drive.

I still go 10c difference, drive side 70c(158f) and passenger side 80c,(176), I will live with it for now I guess, will change caliper on next brake job.