Emergency brake recall fix

[mallardlake]

Has anyone watched (listened to) the video yet? I need some feedback

 

[HardRightEdge]

Personally, I don't trust phone audio to properly represent how loud something is. If it's loud, it's wrong. If it isn't, it ain't.

 

[MrMCar]

There is something wrong there. Tell me, if you place the car in drive, then reverse (NOT moving away) is the noise the same/different/gone?
There should only be a momentary slight hum as the electric motors either apply or remove pressure from the brake pads!

 

[mallardlake]

I will try the drive, then reverse. But I do know it only clunks when the brake caliper/pads let go of the rotor. It will make the humming/whirring noise after shifting out of park, as it releases the brake, but the caliper remains stuck to the rotor until the car moves. then lets go with a clunk, but not all the time. Almost like the brake pads are frozen to the rotor, but it's always in a heated garage. Maybe snow melts and rusts the pads?

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[MrMCar]

Maybe snow melts and rusts the pads?

Could very well be indeed. Back in the day my shop installed all kinds of aftermarket (go fast stuff) brake pads. Many had a higher metallic composition than the factory brake pads.
Brake rotors are indeed similar to railroad tracks. They lightly surface rust when wet and put away. One or two applications of the brake pads and it's gone.
Some types of brake pads can INDEED temporarily stick to the brake disc as a result of oxidation.
The noise could be (??) the pad forcefully being pulled away from the inside surface of the disc.

Tell me; Genuine Kia pads & rotors, OEM or aftermarket?

 

[mallardlake]

Maybe snow melts and rusts the pads?

Could very well be indeed. Back in the day my shop installed all kinds of aftermarket (go fast stuff) brake pads. Many had a higher metallic composition than the factory brake pads.
Brake rotors are indeed similar to railroad tracks. They lightly surface rust when wet and put away. One or two applications of the brake pads and it's gone.
Some types of brake pads can INDEED temporarily stick to the brake disc as a result of oxidation.
The noise could be (??) the pad forcefully being pulled away from the inside surface of the disc.

Tell me; Genuine Kia pads & rotors, OEM or aftermarket?

The car has 11,000 miles on it, all original parts. Seems to only make the noise when shifting to reverse, but that could be because we back out of the garage, so maybe we are not aware of the noise when out of the garage and shifting to drive.

 

[G-341122]

I don't have tension on the transmission. You can see the caliper stuck to the rotor when trying to back out of the garage, and then it releases with a clunk. Still trying to get a video of it. Thanks

Exactly the same with mine. I believe that it is surface rust from brake pad to rotor. I live near a fresh water lake and just overnight the build up of surface rust is ridiculous. CHEAP STEEL being used and cheap rotors

 

[chickdr]

Exactly the same with mine. I believe that it is surface rust from brake pad to rotor. I live near a fresh water lake and just overnight the build up of surface rust is ridiculous. CHEAP STEEL being used and cheap rotors

I have had Audi, Acura, Porsche, BMW and many others. They all show rust on the rotors after I wash the car and it dries overnight. They are are rough when I first leave the garage the after washing and pressing the brake pedla the first time. So far my EPB seems to engage and release smoothly. The clunk being described by the OP seems to be an issue. Maybe the EPB is defective and needs to be replaced? A dealer visit with a drive along to show the tech what is going on is in order.

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[MrMCar]

Exactly the same with mine. I believe that it is surface rust from brake pad to rotor. I live near a fresh water lake and just overnight the build up of surface rust is ridiculous. CHEAP STEEL being used and cheap rotors

It's not cheap steel that promotes the rust. It's mostly about the ferrous content.
Harder (less rust prone) steels will offer different coefficient Cf levels and increase braking distances.
Modern brakes are no longer overbuilt and have brake rotors that can be resurfaced 1, 2 or even 3 times. Carrying extra weight has a MPG penalty. More and more is being asked of smaller (lighter) brakes and in general the Cf is up from years gone by.
Just as engines are getting smaller and doing more work, the braking system is also!

Train tracks last a VERY ling time indeed. NOT cheap steel. They also rust in the same manner, then a train comes by and the surface rust is gone.

The rotors, pads and braking system is engineered with all of this in mind. Even the compounding of the brake pads themselves can deal with a bit of rust w/o any pad failure.
Rusty rotors are nothing new at all.

 

[Deuce Man]

Yes, thanks for your suggestion to buy a toyota.

Most newer Toyota vehicles have automatic parking brake application like Kia-Hyundai.

 

[KMiles]

I get that same clunk the morning after washing either of our cars which both have automatic electric parking brakes. Our other one is a Lexus (Toyota made). As was said above, it goes away quickly and everything is smooth after that. The only thing I do not like about automatic electric parking brakes is what a pain it makes it to do a brake job. I did the rear brakes on the Lexus about a month ago. It took me multiple tries and about 30 minutes to get them into service mode as I don't have a $2000 scan tool that does it.

 

[chickdr]

Yep, it's just another way to try to make you come into the dealer for repairs.

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