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Brake squeak every morning

MadDog70

By MadDog70,
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MadDog70

MadDog70

2nd Gear
(edited)

Ever since I changed to bigger rims, my brakes start to squeak every morning when I start the car. It goes away after a few brakings. I doubt changing rims make this noise. Anyone can advise what could be the problem? Thx

Edited by Lightsabre
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kianewbie

kianewbie

1st Gear

Ever since I changed to bigger rims, my brakes start to squeak every morning when I start the car. It goes away after a few brakings. I doubt changing rims make this noise. Anyone can advise what could be the problem? Thx

 

How old is your car?

Ever change brake pad before?

 

My 5 years car had that problem before. The sound went away after the workshop skim the brake rotor.

Ask the workshop to check for you.

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Thaiyotakamli

Thaiyotakamli

Supersonic

Ever since I changed to bigger rims, my brakes start to squeak every morning when I start the car. It goes away after a few brakings. I doubt changing rims make this noise. Anyone can advise what could be the problem? Thx

Ur rim too big la. Mine also liddat on 20"

 

Downsize ur rim then noise will gone

 

 

Otherwise can try install expensive braking system

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MadDog70

MadDog70

2nd Gear
  • Author

Changed from 17 to 19, my friend changed to 20 also no problem lei.

How old is your car?

Ever change brake pad before?

 

My 5 years car had that problem before. The sound went away after the workshop skim the brake rotor.

Ask the workshop to check for you.

4 yrs old, only 20,000 km mileage.

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EricChan

EricChan

5th Gear
(edited)

A very complex fundamental physical problem that no one - not world class manufacturers , not their suppliers - has ever been able to solve practically or theoretically despite the astounding progress of technology . Have been a subject of constant research in universities over the last 70 years with a lot of complex theories - you name it you got it - but with no answers.

It is simply one of the holy grails of vibration and acoustics engineering - some Professors devoted their entire research lives working on it.

Whoever can claim they have the scientific explanation which solves it will be world famous in the world of automobile. And very rich as they will attract top dollars from the car manufacturers for their research. similarly squeals from rail track wheel interactions (train) - top dollar there if you can solve it and world famous and rich that person will be and the theory will be named after him. Just type these words 'brake squeal university' in Google and you will understand

Edited by EricChan
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Vratenza

Vratenza

Supersonic

A very complex fundamental physical problem that no one - not world class manufacturers , not their suppliers - has ever been able to solve practically or theoretically despite the astounding progress of technology . Have been a subject of constant research in universities over the last 70 years with a lot of complex theories - you name it you got it - but with no answers.

It is simply one of the holy grails of vibration and acoustics engineering - some Professors devoted their entire research lives working on it.

Whoever can claim they have the scientific explanation which solves it will be world famous in the world of automobile. And very rich as they will attract top dollars from the car manufacturers for their research. similarly squeals from rail track wheel interactions (train) - top dollar there if you can solve it and world famous and rich that person will be and the theory will be named after him. Just type these words 'brake squeal university' in Google and you will understand

 

That is one of the longest "I don't know" ever written.

 

:grin:

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EricChan

EricChan

5th Gear
(edited)

That is one of the longest "I don't know" ever written.

 

:grin:

Man i cut my teeth with very complex mathematics working 3 years full time in this area and my papers are in scentific journals the world over. This was more than 20 years ago. Yet my papers still being quoted today. This was in collaboration with so many people learned and with car and brake industries - some of the top in engineering Edited by EricChan
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ChickenMob

ChickenMob

6th Gear

could be the brake dust on the rotor....

some brake pads create more dust ..........mine changed to 4 pot

also squeaking. but as long as it can brake in time i hack care liow hahahaha

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EricChan

EricChan

5th Gear
(edited)

Here's one symposium on brake noise to give you a flavour of the endless research ongoing into this deeply entrenched problem  .... Very dry and heavy reading to the uninitiated (just read pages  1 to 3 for the layman).. 

Holy grail has never been found, like search for cancer solution .. like elixir for life ...

https://books.google.com.sg/books?id=Ik6qBAAAQBAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false

 

 

http://www.aa1car.com/library/tr996.htm

 

Try these. To me the advice is technically sound.

 

Edited by EricChan
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flashbang

flashbang

Turbocharged

Does TS mean the squeaking sound when you slowly release the brakes? I've always noticed that in the first few minutes of driving, brand new car. It goes away after a while, I presume after the rotors and brakes have warmed up. 

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MadDog70

MadDog70

2nd Gear
  • Author

Does TS mean the squeaking sound when you slowly release the brakes? I've always noticed that in the first few minutes of driving, brand new car. It goes away after a while, I presume after the rotors and brakes have warmed up. 

 

Yo bro, exactly the same issue.

But before changing the new rims, I DO NOT have this braking noise at all.

How can new rims create this noise on the braking?

Can't be the workshop guys meddle with the braking system right?

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Vratenza

Vratenza

Supersonic

Yo bro, exactly the same issue.

But before changing the new rims, I DO NOT have this braking noise at all.

How can new rims create this noise on the braking?

Can't be the workshop guys meddle with the braking system right?

if you can be sure that the guys did not touch your brake system, the only plausible explanation is this:

 

When you up 2 inches, unless you go for superlight forged rims, your rim+tyre mass is going to increase and most of this increase in mass is distributed more to the outer part (think wider low profile tyres to maintain the same rolling diameter)

 

This increase in mass on the outer part of the rim+tyre combo along with increased rolling resistance (bigger rubber to road contact patch) is going to increase your momentum/inertia. Your engine will spend energy getting the new rims+tyres up to speed and conversely your brakes will work extra hard to shed the speed.

 

Previously, on your original set of rims+tyres, the amount of pressure on your foot brake pedal translate to a defined amount of pressure the brake pad is being applied onto the rotor surface. Now on this new set of rims+tyres, the amount of pressure applied from the brake pad to the rotor surface may be the same, but now the rotor wants to rotate forward more than previously, causing the brake pad contact surface to "slide" against the rotor giving squeeks. When warmed up, the brake pad is "stickier", so the squeekiness is gone.

 

There you have it, my 5 min thesis on the holy grail.

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EricChan

EricChan

5th Gear
(edited)

if you can be sure that the guys did not touch your brake system, the only plausible explanation is this:

 

When you up 2 inches, unless you go for superlight forged rims, your rim+tyre mass is going to increase and most of this increase in mass is distributed more to the outer part (think wider low profile tyres to maintain the same rolling diameter)

 

This increase in mass on the outer part of the rim+tyre combo along with increased rolling resistance (bigger rubber to road contact patch) is going to increase your momentum/inertia. Your engine will spend energy getting the new rims+tyres up to speed and conversely your brakes will work extra hard to shed the speed.

 

Previously, on your original set of rims+tyres, the amount of pressure on your foot brake pedal translate to a defined amount of pressure the brake pad is being applied onto the rotor surface. Now on this new set of rims+tyres, the amount of pressure applied from the brake pad to the rotor surface may be the same, but now the rotor wants to rotate forward more than previously, causing the brake pad contact surface to "slide" against the rotor giving squeeks. When warmed up, the brake pad is "stickier", so the squeekiness is gone.

 

There you have it, my 5 min thesis on the holy grail.

Good . Now all you have to do is to write it up and submit for your Ph.D. This one is an example on brake squeal for you from Cambridge University to get your doctorate http://www-g.eng.cam.ac.uk/dv_library/Theses/Philippe_thesis.pdf Edited by EricChan
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