Parking brake dragging?

[Homer1952]

I've a 2018 Acadia SLT 2WD 3.6L 24k miles.  I have been noticing a squeal from the LR (left rear) tire.  I just jacked up that corner & tried to spin the tire.  It spins but with a fair bit of effort and squeal.  So I jacked up the RR corner & spun it & it spins freely & no noise.

 

So I either have a slightly seized up caliper or the electronic/electric parking brake is hanging up or misadjusted.  I did exercise the parking brake a few times to no avail.

 

So my question is, is there any adjustment for the parking brake?   Searching online & here I found nothing.

 

Thanks - Bob

[catpartsman]

It could also be that you have a rock stuck between the pads and caliper. This will cause a high pitched squeal and will produce a slight amount of drag on the wheel when rotating.


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[catpartsman]

It could also be that you have a rock stuck between the pads and caliper. This will cause a high pitched squeal and will produce a slight amount of drag on the wheel when rotating.


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Sorry, not caliper and pads, rotor and pads.


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[Homer1952]

Roger that. 

Now that it is getting warmer, I might pull the wheel & look around.  I was just hoping for some info before I make the effort.  At 68YO I like to approach these kinds of activities with as much knowledge as possible.  I know there are folks here that have access to the repair manuals/ bulletins/ etc.

-Bob

[Homer1952]

I removed the wheel today. 

I couldn't get a gnat's eyelash between the pads & the disc rotor.  So no debris.  No grooves on either side of the rotor.

But the rotor has some run-out, causing the squeal & tightness.

I'm guessing the dealer would say normal variation & everything is in spec.

But I know it is making a lot of noise and affecting pad/rotor wear, fuel economy & 0-60 time!! 

I might stop by the dealer & have him assess the noise in the parking lot.

 

Over & out.

[davester]

Could be some rust on the hub behind the rotor causing it to have some runout.  You might try removing the rotor and cleaning the mating surfaces...