Could you please tell me how that works?
Brakes Squeal
- Thread starter bgeorger
- Start date
Certainly, here is a description of how I bed brakes. I posted this in another thread related to this brake noise issue.
After writing that post I learned a whole lot more about brakes from reading posts (in this thread) by forum member Belisarius. I would recommend reading his posts (very informative).
Just for a reference:
Here is a link to the related thread I copied my “bedding brakes” process from.
Post in thread 'NHTSA report a problem'
NHTSA report a problem
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I did something similar, but not the same.
The brakes on my 2024 FE were squealing in reverse big time. They were still squealing after 6K miles.
Two weeks ago I went on a road trip to New Hampshire. While I was there I drove up Mt. Washington (8 miles uphill). Coming back down there is a big problem of people's brakes heating up - so much so that they have pull-offs every 100 yards or so where people need to pull over and let their breaks cool down!
After driving down and having to stop 4-5 times just to let my breaks cool - I have not heard a single squeak since!
The brakes on my 2024 FE were squealing in reverse big time. They were still squealing after 6K miles.
Two weeks ago I went on a road trip to New Hampshire. While I was there I drove up Mt. Washington (8 miles uphill). Coming back down there is a big problem of people's brakes heating up - so much so that they have pull-offs every 100 yards or so where people need to pull over and let their breaks cool down!
After driving down and having to stop 4-5 times just to let my breaks cool - I have not heard a single squeak since!
Hello looks like most LC s do it world wide !!! mine is also squeeling bad in reverse when been sat for a while i,m in the UK
Day four, squeal is back this morning.
Mine definitely squeals 1st time reversing after being parked overnight. I've found 2 very easy solutions that both work for me.
Option 1 back in to parking spot at night.
Option 2 don't use brakes when backing up 1st time, in reverse my truck only moves at 2 mph so it's easy to back up 30 feet without using the brakes and if I need to stop the squeal is very brief.
I'm not suggesting that it isn't a problem, just that I am able to avoid hearing it most of the time.
Option 1 back in to parking spot at night.
Option 2 don't use brakes when backing up 1st time, in reverse my truck only moves at 2 mph so it's easy to back up 30 feet without using the brakes and if I need to stop the squeal is very brief.
I'm not suggesting that it isn't a problem, just that I am able to avoid hearing it most of the time.
I wonder if this is happening because the breaks are not used as rigorously thanks to regenerative breaking, which causes surface rust to form on them. This, at least, is a known issue for EVs.
I believe regenerative breaking is not used in reverse, so this may be the reason why the noise mainly occurs while breaking in reverse.
I believe regenerative breaking is not used in reverse, so this may be the reason why the noise mainly occurs while breaking in reverse.
Indeed, my key suspects are bedding, ability to bed in, brake bias, brake pad rotor quality etc. I wish anyone here posting post service tells us what or how do the pads look like. Do they have shims? And, if folks tried everything, bedding, loaded car bedding etc, we may have to concede that the combination of rotors, pads and brake bias settings induce this frequency. Personally, if this bugged me, I would try an aftermarket higher quality rear rotor set, or pads to start with. However, if the piston pressure is too light, you can glaze or squeal almost any rotor in the universe. I am curious what LC owners with a load, get when backing up. I would suspect a higher piston force and less squealing.
I heard and read firsthand accounts of tesla owners hit with 8,000 USD bills as their regen ruined rotors and seized one or two pistons. 4 rotors + 2 new callipers, the bill gets ugly. So regen braking never causes rust, it is moisture and oxidization, and yes, this occurs if regen braking has the owner NOT using brakes. Canadian Tesla owners I know, tell me changing the bias Braking vs regen. Because what also happens it when you DO need emergency braking, unused glazed or unbedded rotors, on cold asphalt just double your braking distance on a 5500 lbs or heavier sedan. The rotor capacity to absorb energy is fractional. So if you are a heavy EV owner, never touch or use the brakes to let the mass heat them up, frankly, you are begging for stupid bills. May save some kw/hr but thousands of dollars in repair bills and CO2 manufacturing steel rotors nullifies everything.
Sooo cool to hear! You guys never mentioned getting a free back up alert sound
At least is not the kraa kraa kraa modern equipment uses. What can I say, low piston pressure, gentle pad engagement, perhaps new unbedded rotors etc. But that is indeed pad on rotor frequency squeal.
But why only in reverse.....
Miss Daisy is an equal opportunity squealer. She does it going in both directions.. forward, and reverse..
At first, it used to only be first thing in the morning. Now, it’s always after I get home from work, which is about a 5-20 min drive. Although, it seems to be less loud since I took a short road trip (about 409 miles rt). I was driving a bit more aggressively, this braking more aggressively. 
I finally had a squeal in reverse and I think I know why it happened to me. I usually garage the LC and I left it out on a high fog night. I'm pretty sure it was due to condensation on the brake parts. It only happened once in 5k miles and has never happened again.
For those of you where this has happened consistently do you park outside?
For those of you where this has happened consistently do you park outside?
Inside, outside...
Doesn't matter.
Granted its PNW in the fall, so there's plenty of condensation/moisture.
Doesn’t matter if it’s park inside our outside the garage. I’ve even had it when it was sunny and dry and had been driven a while.
Hey Belisarius, Do you have any recommendations on higher quality rotors and pads for the LC250? I’m not looking to replace mine yet, but for those who do want to replace.
Really hoping Toyota will follow Lexus’s lead with the GX550.
Yea, Miss Daisy squeals whenever she wants to.. morning, night, forward, reverse.. it is getting embarrassing..At first, it used to only be first thing in the morning. Now, it’s always after I get home from work, which is about a 5-20 min drive. Although, it seems to be less loud since I took a short road trip (about 409 miles rt). I was driving a bit more aggressively, this braking more aggressively.
