Right rear brake disk hot

[Jarmo]

I have a 2016 Auris hybrid. The issue is with the right rear brake heating up. I've replaced the new cylinder and the flexible brake hose connected to the cylinder, but the issue still persists. The sliding pins move well, and the pads move well in the caliper. The handbrake returns correctly. The left rear disc and front discs remain cool. Where could the problem be? No fault codes or lights or unusual noises. The Wheel bearing is in good condition rear axle itself rotates well. Could the issue be in the ABS unit or elsewhere? What to check next? 

[APS]

Does the wheel really rotate freely once you have applied the brakes / parking brake a few times? Something may be moving and causing friction when you are driving. The first thing to check is whether it is the parking brake (drum/shoes) or the caliper.

 

[flash22]

did you replace the caliper? or just its cylinder and seals if so did you hone the bore

if you replace the caliper, is it the correct one  (bleed nipple to the top) as there are left and right-handed calipers

did you wind the caliper back correctly

is it the pad hanging up

check the hard line and the second flex line - did it bleed ok?

[APS]

If you replaced the calliper - have you bled the system enough afterwards? 

 

[Bper]

Even though the caliper slides seem functional, the piston itself might be sticking slightly. This can cause the brake pad to stay partially engaged with the disc, leading to overheating.

There could be an internal issue within the caliper itself, like a damaged seal or corrosion, causing the piston to not retract fully.

Though you mentioned the handbrake seems to be functioning correctly, there could be an issue with the parking brake mechanism that's causing the right rear brake to drag slightly.

I would take a closer look at the caliper. You can look for signs of corrosion or damage on the piston or its bore. inspect it and possibly rebuild the caliper.

Since you have no warning lights and the other brakes aren't overheating, a problem with the ABS unit is less likely, but it can't be entirely ruled out. 

[solero]

Dont know much about hybrid brakes, but some rear disc pads have a raised notch which needs to be lined up with piston groove, before sliding caliper home.

[Jarmo]

It does not rotate freely, meaning it drags significantly more than the left side. There is no separate brake drum; instead, the handbrake operates through the pads. The dragging was the original reason why I replaced the entire cylinder with a new factory-remanufactured one. (not the original part). The piston itself moved smoothly in and out. Bleeding was done after the cylinder replacement. 

[solero]

Did you wire brush file down copper grease seating grooves for pads. Do they move freely back n forth.

[xrhstosgr]

In this model there are no handbrake cables to stop the vehicle when in park? Jarmo when you say that the parking brake works through the pads, do you mean through fluids or with a wire rope? Every car through the pads doesn't stop with the parking brake? Thanks

[TonyHSD]

Slider pins can cause exactly this issue. Wrong quantity grease, usually more than necessary can push the pins and they will force the calliper to one side applying pressure and the pad will drag onto the disc. 
Take calliper off, remove slider pins, remove rubber boots, clean everything thoroughly , use a small screwdriver or similar tool to insert small amount of silicone grease inside the pin holes, put in slider pins without boots and rotate few times, push in and out then take the pins out, insert the boots and apply thin film of grease onto the slider but not much and keep the face of the pin only slightly covered in grease, insert back , push in and squeeze the rubber boot to let any air out. So now the pin can move in and out and rotate freely and when to leave it it should stay in place and not poke out. Put all parts together and test the free rotation of the wheel . Test drive and measure temperature.