FAQ: Vibration under braking: warped rotors? NO!

[eflyguy]

I stand corrected. I saw the "connection" to the rear brakes on the schematic, but didn't realize there was a different activation mechanism. That makes the rear brake setup even more intriguing..

 

[Capecod]

 

[Manaz]

I stand corrected. I saw the "connection" to the rear brakes on the schematic, but didn't realize there was a different activation mechanism. That makes the rear brake setup even more intriguing..

A hybrid drum/rotor setup for hand-brake and regular rear brakes is pretty common.

 

[MerlintheMad]

View attachment 25244

View attachment 25245

View attachment 25243

"Auto hold helps keep vehicle in a stop condition by applying hydraulic brake at a stop."
So, does this mean that auto hold uses the parking brake instead?

 

[PhilG]

ok, i have this problem too...what i need to know is who at Kia do i need to contact to resolve this? my dealer says its not unwarrantable past 12k

 

[MerlintheMad]

"Auto hold helps keep vehicle in a stop condition by applying hydraulic brake at a stop."
So, does this mean that auto hold uses the parking brake instead?

FAQ: Vibration under braking: warped rotors? NO! Heh! How soon we (I) forget.

And this is why I have not experienced any issues with rough, lumpy, vibrating brakes: I've been using auto hold since I got the car.

 

[Capecod]

"Auto hold helps keep vehicle in a stop condition by applying hydraulic brake at a stop."
So, does this mean that auto hold uses the parking brake instead?

I assumed the applying hydraulic brake means pads on rotors?

 

[MerlintheMad]

I assumed the applying hydraulic brake means pads on rotors?

Apparently not. A "drum" brake is applied on the inside of the rotor. The overheated pads do not remain in contact with the rotors when using auto hold.

 

[MerlintheMad]

ok, i have this problem too...what i need to know is who at Kia do i need to contact to resolve this? my dealer says its not unwarrantable past 12k

Warranty has been extended beyond 12K miles for some owners. But I wouldn't count on it (anymore). Have you tried "burning the deposits" off with some hard braking from freeway speeds? If I had manifesting vibration when braking, I'd be doing that automatically (while shouting GRRRRR!!! all the while).

 

[Helo58]

Block 11, shows the ebrake shoes separate from the rotor, pads, and caliper shown in 1 and 6 respectively. Taken from REAR SUSPENSION. BRAKE COMPONENTS. W/BREMBO.. For Kia Stinger | Hyman Bros Kia Parts

That being said, when doing an e-brake launch, I find it hard to believe that this ebrake (1-sided-left) only is holding back the Stinger's torque.

 

[MerlintheMad]

That being said, when doing an e-brake launch, I find it hard to believe that this ebrake (1-sided-left) only is holding back the Stinger's torque.

I have never heard of such a thing. Are you saying that some do a launch (not with launch control, surely?!) by holding up on the parking brake and pushing down on the gas, then letting go of the parking brake? I wouldn't even think of trying that!

 

[Helo58]

I have never heard of such a thing. Are you saying that some do a launch (not with launch control, surely?!) by holding up on the parking brake and pushing down on the gas, then letting go of the parking brake? I wouldn't even think of trying that!

With your prevalence on the site, surely you have seen this!? It simply allows you to build more boost while stationary than the foot brake or launch control allow.

 

[MerlintheMad]

With your prevalence on the site, surely you have seen this!? It simply allows you to build more boost while stationary than the foot brake or launch control allow.

No. I never visualized this, not once. And you're right, only gripping the LR wheel wouldn't allow this to happen. So, are we back to square one? Or are there two e-brakes in back?

 

[Christopher Léger]

Sorry for double posting in 2 threads...
Anyone know time/mileage this can be passed off on car waranty?

 

[Helo58]

Sorry for double posting in 2 threads...
Anyone know time/mileage this can be passed off on car waranty?

I think that due to the high occurrence of this, Kia is handling this on a case-by-case basis. You may have to find a dealer willing to work with you if one doesn't.

 

[Helo58]

No. I never visualized this, not once. And you're right, only gripping the LR wheel wouldn't allow this to happen. So, are we back to square one? Or are there two e-brakes in back?

Many (not everyone) can confirm that the e-brake will hold the GT(x) at launch. What remains to be seen is how. Is it just the ebrake on one wheel, two rear wheels, or the entire braking system if slippage is detected on just the ebrake. When I did the ebrake launch, it felt like it slipped at first and then a larger braking force stopped the car when the ebrake was reapplied. I have no proof, just what it felt like. Anyone have similar experiences?

 

[MerlintheMad]

When I did the ebrake launch, it felt like it slipped at first and then a larger braking force stopped the car when the ebrake was reapplied. I have no proof, just what it felt like. Anyone have similar experiences?

The text that @Capecod posted talks about variable grip applied to the e-brake based on slope and perceived need. So that would make sense in the case of using the e-brake to launch with: it starts out light then goes (probably) to max grip because of the force on the accelerator.

 

[eflyguy]

ebrake shoes separate from the rotor and caliper

I am happily dumbfounded.. never heard of such a thing. Brilliant.

 

[Metalmania82]

The electronic e-brakes have been around for a while, mostly in the Germans cars first of course but Subaru started using it in their Outbacks a few generations ago. They work the same as a standard set-up, using shoes on the inside of the rear drums/rotors. And I believe the auto hold is the same as the Germans, using the brake pads.

Next time you come a red light, try it. Once using auto-hold, then the following engage the e-brakes and let your foot off the brake pedal, you'll feel the difference.

 

[MerlintheMad]

The electronic e-brakes have been around for a while, mostly in the Germans cars first of course but Subaru started using it in their Outbacks a few generations ago. They work the same as a standard set-up, using shoes on the inside of the rear drums/rotors. And I believe the auto hold is the same as the Germans, using the brake pads.

Next time you come a red light, try it. Once using auto-hold, then the following engage the e-brakes and let your foot off the brake pedal, you'll feel the difference.

So, in your opinion, the auto hold does not spare the rotors when waiting at a light? But if the e-brake is applied in the place of auto hold, the overheated pads won't be touching the rotors?