2021 Hybrid 1.8 - front brakes short squeaks

[Corolladriver24]

I've noticed this with my new (to me) Corolla. If I'm gentle with the breaks/accelerator it doesn't tend to do it.

[rado77]

When I'm gentle it's even worse! :-) And creak sound is longer and louder. Plus when I'm on brake and I need to fully turn the steeringwheel....omg! People are looking on me and my car, what a crap is parking there :-) 1st I thought that this creaking is caused by upper shock absorber area or springs...but no, it's related to brake pads/discs. Yep, let's wait for pads replacement

[RabButler]

It sounds like you are describing the low speed audible warning.

[rado77]

So yesterday I did full front brakes restoration trying to fix short squeal diring stopping the car, and releasing brake pedal (see my 2 videos above in this topic). I applied brake cleaner on both sides of brake rotors (discs), applied thermal copper paste on guide pins and whole outside sides of brake pads. I found the issue. It's dust collecting on both sides of brake discs. When I wash discs with pressurized water (or clean them by any other way), squeals are gone. But when I use brake few times, it's back - when disc dries and dust from brake pads collects on discs again. It's most probably caused by brake pads material, which is soft. That's why replacing pads by the dealer didn't help...because they used original pads again. Strange is that many other Corollas hybrid doesn't do it...some do, some not :-) But I don't want to waste money to test my suspicion by buying ATE or Ferodo brake pads :-)

[TonyHSD]

As long as the brakes does not bind , the discs are clean and shiny ad you don’t get nasty vibrations you read should not be worrying about any typical brake squeaking noises. Those comes and goes from time to time. Just regular car washes and use the brakes more progressive will keep everything working nice and smooth. 
I have an elderly lady with an excel Corolla likes to park front of my house and I noted her brake discs are always clean and rust free. 
For the pads if ever need to change you can buy something else and not oem Toyota but make sure you only buy standard soft materials pads and stay clear off any harder or sport type brake pads because those require heating up before they start to work properly. Hybrids always has cold brakes. 
I use cheap brake discs Febi or Blueprint for my hybrid and EBC Ultimax standard pads. For me this combination is as good as original Toyota or even better. No issues, no brake dust, no noises, and brake performance is absolutely great. 👌

[rado77]

Few minutes ago I tedted my finding....and it's the same - I pressure washed brake discs and 3 full stops were completely silent. On 4th stop I slightly heard tiny squeal, and after that "full squeal" was back again. Strange :-) Funny :-) Why it bothers me? Not because of the 0.25 seconds sound on every stop/releasing brake pedal (even if pedestrians walking nearby turn their heads :-) ), but the vibration of whole car during that squeals...I feel it in steering wheel, feel through seat...that's why I cannot imagine that Toyota released car with this issue and told "yeah, it's ok, noone will complain..."

[fred88]

Read Tony's post above. If there's vibration then it's likely something isn't right. 

[rado77]

That vibration is going directly from brakes...for example if car is stopped on traffic lights and I slowly release brake pedal, very short squeal sound is there + tiny chassis vibration. It's hard to explain...but if you watch my 2 videos you can imagine. It's not some safety issue or something like that...it's only disruptive :-) If I release pedal quickly, it's for example 10ms long. If I release pedal very slowly, it's... I don't know...0.25 seconds. But what is also strange, when I brake very gently to the full stop, many times there's no squeal sound. Sometimes yes, sometimes not. It's only "cosmetics" issue. But when radio is ON, it's OK :-) Dealership told me that this is normal. Of course I wanted to figure out what's the issue because some Corolla hybrids are without that noise

[TonyHSD]

19 minutes ago, rado77 said:

That vibration is going directly from brakes...for example if car is stopped on traffic lights and I slowly release brake pedal, very short squeal sound is there + tiny chassis vibration. It's hard to explain...but if you watch my 2 videos you can imagine. It's not some safety issue or something like that...it's only disruptive 🙂 If I release pedal quickly, it's for example 10ms long. If I release pedal very slowly, it's... I don't know...0.25 seconds. But what is also strange, when I brake very gently to the full stop, many times there's no squeal sound. Sometimes yes, sometimes not. It's only "cosmetics" issue. But when radio is ON, it's OK 🙂 Dealership told me that this is normal. Of course I wanted to figure out what's the issue because some Corolla hybrids are without that noise

If you have any problems with your brakes unless very obvious the dealer mechanics will not find it. 
If you are diy oriented and want to help yourself you can do so and you right need many tools or to change parts. 
You need just brake cleaner sprays, wire brushes, torque wrench, and some more wrenches . You need to remove all brake components, clean any lube and corrosion from anywhere , clean properly the slider pins amd apply thin film of silicon grease on them , fit all parts without grease and torque to speck the wheel bolts. Take it easy in the next 200 miles until brakes bed in correctly and you should not have any issues. 

[rado77]

Yes yes, I did everything ;-) I'm experienced in classis mechanical repairs. There's nothing else I can do, also 2 mechanics from dealership tested it (I was also in the car) and both told me that this is typical behavior - MG2 force (forward) against brake force (stop). Yeah...I'll keep it as it is...I just wanted to hear from guys here if they have the same "issue"