Hi all, my car is only a year old but has been having the squealing brake issue when the car is braking at low speed. Brake pads have been deglazed but the squeaking noise is still there. What other issues might have caused the brake noise? Thanks
Squealing Brakes at Low Speed
[Deactivated] on 13/10/2020 - 17:54
Comments
Rock or dust stuck in the caliper/sticking pad
Loose shim on the pad/caliper (if it has them)
Something stuck in the pad or the wear indicator groove in the pad
A stuck/sticky caliper piston
Pads and discs have become glazed again (if it was some time ago that it was de-glazed.)
Contamination in the brake fluid (water expands)
Pads are worn out/down to wear limit indicator
Pads touching outer ridge on worn disc.
Wrong type of pad materialWhat sort of vehicle and what sort of driving? How long since brakes were done? It's not something exotic like the Mercedes Benz brake package where morons were buying track brake package and driving it at 20km/h in stop start morning commutes…
Car is a year old? Warranty.
This. Of course it's a 2019 AMG G running 400mm octopot Brembos. This is OzB!
It’s a Mazda 3, dealers deglazed the brake pads a couple of weeks ago but didn’t find out any other issues
In that case, you will need to be able to replicate the issue on a regular basis and then when you know what driving causes the noise, book it in with the dealer and get a mechanic to go for a drive with you and replicate the nose for them.
What you are describing as brake squeal to them may be something else if they hear it for themselves. People drive vehicles very differently, so if you just drop it off with nothing more than a description, the person who tests it may not hear anything or be able to replicate the noise and just mark it as no fault found.
Why did the pads need deglazing?
I want to know this too. Unless OP has gotten the brakes very very hot, I can't see why that would be needed. If the dealer has just sanded them a bit (or more likely just rubbed them on the concrete floor), the pads won't be even and will need to be bed in again.
Could be the rotors are too smooth so it gives off a squeal. Seen it before where people are such slow and easy drivers that the rotors don't get any wear, so the grip when the brakes catch on just glides. Can't be sure what it is though, but you could try sandpapering them to get some of that smoothness out.
This answer, while impressive, just makes me want to stick to working on my PC and catching ubers.
Take it to the dealer for a free repair covered under warranty
How can it be a warranty claim until the cause of the problem is identified?
that's the dealers job, to find the cause of the problem!! If you drop off your car there then they will give you a free loaner car until they fix the issue
No. The dealers job is to bend you over and extract as much money as possible from your wallet.
They get $40/hr for warranty work. And maybe $120/hr for non-warranty work.
They may or may not give a loaner car.
Where do you get your info?
@oscargamer: Its called a warranty and I am pretty sure brakes that squeak are covered under warranty
@jayboi: You would be wrong.
This is only one example https://www.google.com/search?client=firefox-b-d&q=mercedes+…
Unless it's brand new the OP would have 0 chance of getting this under warranty.
Too many factors can cause contamination, if anything would need to be taken back to a mechanic rather than the dealer.
It doesn't hurt to call up the dealer and see what they say
jay - stop talking, you are making yourself look more foolish with every post
@oscargamer: Whats wrong with calling the dealer? Will they send the FBI to your house? Since you are the obvious genius here, you tell me, what's wrong with doing that?
@jayboi After they stop laughing they'll tell you your brakes and rotors need replacing and charge a few hundred dollars to blow the dust out with an air hose.
@Hithere: Yup. And when you question why the breaks and rotors wore out that quick they would tell you it is the way you drive/break so not much they could do other than replacing those at your expense as wear and tear is not covered under warranty.
Late 2000s Honda Civic?
My car is only a year old
It'll likely be brake squeal. This is due to the vibration of the pad. You need to put an anti-squeal compound on the back face of the pad. Use copper grease or similar.
I'm not sure if it's the same deal with bikes and cars, but definitely when i was a bike mechanic we'd pump the brakes while going down hill and ride around with them on. This would burn off the contaminants and get rid of the squeal.
Maybe head down a couple of huge hills or brake constantly?
Just brake at high speed only from now on. Problem solved.
That's very irresponsible. OP should only brake super hard when the traffic lights turn yellow.
that's probably what caused the glazing…
Take it back to the dealer and get them to fix it. If they don't make a formal complaint with the car manufacturer that the dealer cannot fix a "Squealing Brakes at Low Speed" under warranty.
OP, what car do you have?
Thanks, didnt see that comment
Some brake pads have a metal tab in them that squeals when your pads are worn out..
Slow down using the tranny
It's illegal to hit pedestrians.
I see what you did there
Check if the rotors have slight rust or buildup from the outside of the rim. You will look weird, but go about 5-10km/h and then brake and go about ten times in your street or place with no traffic. This scrapes the rust or buildup off the rotor. May also help the pad even out a bit better. If you don't change your driving habits, they will get glazed again. The cheapest I could find was $80 off brand at Repco and $150 for OEM. Guessing the dealer wanted $200 or so to change pads?
Had the same issue with my car. Took it to my mechanic for an unrelated issue and as soon as he heard the noise he told me to replace my cars transmission fluid. It doesn't make much sense but it did fix the problem for me.
Just something to keep in mind if no other proper solutions work.
Its all guess work
Get it checked out by Mazda
It would still be under warranty I assume
Might need to be bedded in properly and maybe you drive like a grandma so the car doesn't like it, go for a good drive brake hard from like 60km/hr a few times obviously in a safe location… Will help to bed the brakes in properly and possibly blow the cobwebs out
Brake dust