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Discussion Starter #1
I own a 2021 Trailblazer LS and since day one there is a "click" sound coming from the break pedal nearly every single time I depress the break, even lightly. It sounds like a switch being activated, I took it to dealer who literally said he had no clue as to what it was, but I shouldn't worry because the vehicle breaks fine. He never once had it checked out by an actual mechanic. Even more strange, while pushing on pedal, continuously braking while going over big bumps in road, the clicking sound appears- so it is not just while initially stepping on pedal. This is driving me crazy with worry. Anyone else experiencing this annoying sound?
 

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2021 Trailblazer Activ Zeus Bronze Metallic (+ 2016 Cadillac CTS)
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Yep. Same thing since the day I bought it. I assumed it had something to do with the electric brake booster. It doesn't annoy me too much, though.
 

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Discussion Starter #3
I am SO happy to have found someone experiencing the same thing!! Do you have any idea of what it is, what's causing it? Did you ever take it to dealer for their opinion? The recall for the electronic break system starts Nov. 9th, I'm hoping when I take it in, (to a different dealership than the one who blew me off!) that I'll find a Chevy mechanic who takes me seriously. I just need someone to assure me it's nothing to worry about! Sorry for the long post and all the questions, but I am just so relieved to hear from someone with the same problem!
 

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2021 Trailblazer Activ Zeus Bronze Metallic (+ 2016 Cadillac CTS)
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I didn't take it to a dealer because I assumed it was normal. I think it's just a switch related to the electronic brake booster, but there are some experts in this forum who may be able to provide more context.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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I noticed it when we first bought our Trailblazer, but I don't notice it anymore. Just about everything these days is drive by wire and the Trailblazer also has a brake by wire system. Far more electronics controlling these systems now, so stuff like this is normal, but odd at first because your not used to hearing it. Overall I think the brakes on the Trailblazer are excellent. The brakes might be a little sensitive at the top of the pedal range, but that's due to the electric vacuum pump which provides instant assist instead of relying on engine vacuum for assist.

Steve
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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Keep in mind we also have "automatic emergency braking", "front pedestrian braking", "adaptive cruise control" and "StabiliTrak". All of these systems can apply the brakes without driver input. StabiliTrak (ESC) electronic stability control, can independently apply pressure to each brake caliper in order to provide traction and keep the vehicle pointed in the right direction. All of these systems require the computer to constantly evaluate the brake pedal position in relation to these systems which requires calibration checks to make sure everything is working properly. I suspect the clicking noise we've heard is just a system/calibration check.

Steve
 

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Discussion Starter #7
Hello, thanks for replying to my post.. you mentioned that you do not notice the clicking sound anymore- is that because the sound isn't made anymore, OR you just don't pay any attention to it anymore? I have never heard of these noises occuring and being considered 'normal'; thank you for explaining this issue- I am gradually beginning to accept it as normal, however annoying. One more thing- in your opinion, is there anything that the dealership mechanics can be done to quiet it?
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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I think I've just gotten used to the noise, but I'll pay more attention to it and report back. I honesty think it's a normal noise and nothing to worry about. When you turn the car off and listen carefully you can actually here other electronics making noises especially in the engine compartment. My Colorado ZR2 makes similar noises and my old Cruze Eco also made noises like this. Again there are so many electronic systems using solenoids, servos, etc that some of these noises are just normal.

Steve
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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The dealership will most likely tell you the noises are normal, but it can't hurt to ask a technician to listen to it and give you their opinion.

Steve
 

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Discussion Starter #10
Thanks for your help, I feel better just knowing others experience the same thing. If you get a chance, let me know if you do indeed still hear it.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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Thanks for your help, I feel better just knowing others experience the same thing. If you get a chance, let me know if you do indeed still hear it.
No problem, I'll pay attention and report back whether or not the noise is still there. Forums like this are the best resource for owners to ask questions about their vehicles, especially new models like the Trailblazer. We often learn more from other owners than we do from from the dealerships or manufacturers.

Steve
 

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2021 TB Zues Bronze Activ
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Mine clicks when I hit the brakes. Never notice it otherwise but if it is doing it I can't hear it over the radio. ha ha
 

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2021 Trailblazer RS
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Re-post from another thread to here:


Just got to 1,800 miles. Thus far the issues I’ve had or found is: brakes. Brakes sound like nails on a chalkboard, in reverse, creeping speed and up to 5 mph.
other issues are:

An ESC power steering malfunction alarm just after starting remotely and getting in and driving off. We parked, turned it off and then turned it back on to see the message had went away.

There seems to be a shudder, random, but a low rpms/idling. Might be variable of the 3 cylinder and the turbo, which I’m sure has to have some exhaust restrictions as it is all stock still. Purely speculation.

and the plastic side paneling in the RS model, seems to be pulling at part from the body in some areas. Will be interesting to see if any glue melts out next summer...
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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Re-post from another thread to here:


Just got to 1,800 miles. Thus far the issues I’ve had or found is: brakes. Brakes sound like nails on a chalkboard, in reverse, creeping speed and up to 5 mph.
other issues are:

An ESC power steering malfunction alarm just after starting remotely and getting in and driving off. We parked, turned it off and then turned it back on to see the message had went away.

There seems to be a shudder, random, but a low rpms/idling. Might be variable of the 3 cylinder and the turbo, which I’m sure has to have some exhaust restrictions as it is all stock still. Purely speculation.

and the plastic side paneling in the RS model, seems to be pulling at part from the body in some areas. Will be interesting to see if any glue melts out next summer...
I would "safely" try a couple of hard stops from 60 to 0 to remove glazing off the pads. This might help take care of the screeching sound if it's caused by glazing. Sometimes when the pads aren't properly bedded they will glaze over. If that doesn't get rid of the sound I would definitely have the dealership look at the brakes. The brakes on my RS work very good with no unusual sounds at any speeds.

If you are getting those ESC and service power steering warnings it's most likely due to software glitches that GM engineers are working on right now. They should have a updated software to download soon. If the warning lights don't go away or if you also get a CEL (check engine light) take it to your dealership just in case something is wrong.

The shudder your talking about is part of the inherent nature of 3 cylinder engines. The 1.2 and 1.3 engines have an internal balance shaft to compensate for some of the vibration as well as vibration reducing engine mounts. Even with all that help they still like to shake and vibrate at low rpms. I have noticed the shudder/shake a few times, but only when idling at a stop in gear. You shouldn't feel it at higher rpms.

As far as body panels go, I'm not having any problems on my RS right now, but you never know what's going to happen with a new model in it's 1st year, so we should all keep an eye out for warping misaligned panels and report them to NHTSA and your dealership.

Steve
 

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2021 LT AWD
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Since this thread first started I have been listening more to see if mine makes this noise and I still do not hear it. The only noise I do not like is when touching the screen to change radio channels it will make a popping noise. Nothing with the brakes.
 

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Since this thread first started I have been listening more to see if mine makes this noise and I still do not hear it. The only noise I do not like is when touching the screen to change radio channels it will make a popping noise. Nothing with the brakes.
I also have not heard this noise with the brakes.
Trail Blazed, I believe there is a setting in one of the menus to turn off the click when touching the touch screen, don't remember which one but I turned it on.
 
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