Started the car this morning and couldn't move it due to ebrake not release, damn it. Does anyone have same problem? this is for early 2020 model z51

 

Is it frozen from cold? I'm assuming you also tried the push button to deactuate it, did it make noise?

 

Might be rusted. This is why I never park my C8 in the garage with the EPB engaged.

 

Did you get it to release?

 

I never use the EPB. That's what "Park" is for.

 

If you like have 3700 lbs of car bouncing off the parking pawl.

 

Did you try putting the car in gear and giving it a little gas? It's supposed to release automatically in that situation, and if the pad is frozen or rusted to the disk that might free it.

 

I thought I had heard somewhere that when you put the car in park, the parking brake automatically engages...

 

Gotta love new technology!! Never in 55 years of auto ownerships have I had a mechanical cable parking brake system fail. But my very first electric parking brake system in my 2018 MB AMG 43 SUV failed several months ago locking the wheels and leaving the wife stranded. The flat bed truck driver had to apply lots of throttle to overwhelm the locked brakes to get it on the flat bed. Over $1000 to replace the RR caliper with park brake actuator. Driver DIC was flashing a warning at engine start that electric brake system had failed.

 

It’s an option in the settings.

 

We're flat as a pancake in NE SC and I do the same! BUT for the OP, this is one reason:
I had two C7's. Both standard shift so used the parking brake. Soon after I got my 1st, an early 2014 I tried the "automatic release" when I backed out of the garage. Car stalled. I decided I would just give it more gas. With a BANG it released BUT the red dash ICON saying parking brake engaged was on. It wasn't as tested with car on my slight slope driveway and it rolled fine. BUT that ICON was on the whole 25 miles to town. Thought I would have to bring it to the dealer BUT when I started on my trip home it was gone. Decided then, didn't want to test using it again. Never did for my 2014 or my 2017 Grand Sport. Always released with the switch.

Frankly 1st time I knew there was a parking brake switch for the C8 was when someone complained about it's location! Frankly thought it was automatically applied when in park and released when in a gear.

 

That's what it's designed for.

 

The EPB actuates automatically IF you're on a hill.

Brakes are cheaper than transmissions..

 

It was designed to be operated per the owners manual. The owners manual tells you to set the parking brake when you park.

 

Please point out where. I certainly haven't seen that option in my 2021.

 

OP - did you get it figured out or resolved? Would like to hear what the problem turned out to be.

 

Negative. Check page 205 of the owners manual.
It will automatically release if you try to drive off with it engaged, but it will grip for a while and GM says this will wear the pads down and should be avoided. So press the EPB to release before driving off.
HSA or hill start assist may automatically engage the EPB if the vehicle senses you aren't applying the brakes properly to prevent rollback.



The pawl engages within the DCT. It's an internal part. The pawl doesn't always fit perfectly when engaged and the vehicle has to move a little for the pawl to fully engage to its locked position. So the car can gain a little momentum and generate quite a bit of force on the pawl to hold the vehicle once it fully engages in the slot. The vehicle will literally bounce. Yikes.
See the picture above of the TR9080 pawl setup. You can also see the manual override which is what requires the special tool to unlock the DCT if the engine should fail.
What I am concerned about with that pawl is that this wear/tear of only using the pawl may lead to metal fragments that could foul a solenoid. Seems like the #1 issue with this DCT that you might have some ability to avoid is solenoids getting stuck and there are a lot of solenoids in this transmission.

The EPB is a motorized brake pad that engages the rear brake rotors. These clamp down with enough force to hold the vehicle without any stress on the pawl.
I use the EPB at all times when driving around town and parking somewhere. At home, I never use it because I have wheel stops in my garage and it is unnecessary. Also leaving it engaged for a long time might lead to it getting stuck/rusted to the rotor. It's also one less cycle on the device.

How many solenoids are there in the TR9080? 14 solenoids!
https://gearsmagazine.com/magazine/a...tremec-tr9080/

 

Yes i did, stepped halfway down gas pedal and car almost went through garage door lol

 

I have. 2000 Cadillac Deville. Something rusted in the linkage to the parking brakes - they released enough that the dragging was not initially noticeable when driving off. But it was enough to burn up the pads and rotors. It was repaired by the dealer, at my expense, because it was out of warranty. But, they did not get it right the first time, and it burned up the pads and rotor again. The second repair was free, and fixed it. That Cadillac was an all around terrible car for reliability.

 

I had this happen to my car. One morning my wife was taking the car. She came back in from the garage and said the car wouldn't move when she put it in reverse. I went out and found the car was not moving. I gave it more throttle and finally it broke loose and launched a little (but in control).

I just washed the car the day before then put it right back in the garage without driving it. I reasoned that if the rear brakes were wet when I pulled the car back in the garage 15 feet, shut it off, the EPB engaged (with pads wet), the rear pads would "cold weld" themselves to the rotors. I repeated it one more time and surely enough, same rear brake lock the next day.

So now, I either will take the car around the block to dry the pads and rotors, OR, if I just pull it in the garage after a wash I will stop the engine then disengage the EPB. Here the car is on level ground in the garage and I don't fear the car sitting all night on just the parking pawl.