Brake disc question

[cainam]

Hello. After my last few journeys I've been checking my brake disc temps and I've noticed something unusual. 3 corners are too hot to touch as expected but the rear drivers side is only warmish. What possible cause is there for this?
Reason I was checking is that I have noticed a speed related droning noise which seems to come from the same corner as the cooler disc. Thought it was most likely a bearing rather than a caliper issue as there's no vibration.

[Fastdruid]

Seized brake piston(s) or wobbly wheel bearings.

[HughG]

Fastdruid said:

Seized brake piston(s) or wobbly wheel bearings.

Or sticky sliders for the calliper so depending on type

[cainam]

Thanks for the speedy replies. Thought if it was a sticky caliper it would cause the disc to become red hot?

[stevieturbo]

cainam said:

Thanks for the speedy replies. Thought if it was a sticky caliper it would cause the disc to become red hot?

Seized on...or seized off.

[cainam]

Ok so assuming it's seized off why would it be noisy? Apologies if I'm asking daft questions but my mechanical knowledge is very basic.

[E-bmw]

2 separate issues with 2 separate solutions by the sound of it.

[stevieturbo]

Exactly, could be more than one problem.

Either way, fix the most obvious ones first.