Sharp screeching sound from brakes at very low speed

[bryan_t]

My brakes give me this sharp, screeching sound (the best I can describe it) at really low speed, typically at the point of release of brakes from stop-to-go and sometimes when coming to a full stop at really low speed. For example, during parking where small adjustments have to be made with the car moving and and stopping. This problem is usually more pronounced after the car had been parked for a period of time.

Have gone to the workshop to look into this problem, where they removed the brake pads and chamfered the edges, as well as lubricating parts of the brakes. Still, problem exist.

Is this a common problem or it's just me? Had no such problems with other cars in the past.

 

[wt_know]

Re: Sharp screeching sound from brakes at very low speed

i have the screeching sound for my e90 320 since day 1 i collect the new car. went to pml and the answer is that's normal.
the screeching sound is at the point release of brakes from stop-to-go .... very obvious and persistent ... you won't miss it.

 

[jinooi]

Re: Sharp screeching sound from brakes at very low speed

you need to bed-in your brakes.

go do a search on this topic in this forum - i've provided the link in previous threads.

 

[bryan_t]

Re: Sharp screeching sound from brakes at very low speed

you need to bed-in your brakes.

go do a search on this topic in this forum - i've provided the link in previous threads.

thanks, have read up the steps and will try it soon.

 

[Red_Bean_Bun]

Re: Sharp screeching sound from brakes at very low speed

My brakes give me this sharp, screeching sound (the best I can describe it) at really low speed, typically at the point of release of brakes from stop-to-go and sometimes when coming to a full stop at really low speed. For example, during parking where small adjustments have to be made with the car moving and and stopping. This problem is usually more pronounced after the car had been parked for a period of time.

Have gone to the workshop to look into this problem, where they removed the brake pads and chamfered the edges, as well as lubricating parts of the brakes. Still, problem exist.

Is this a common problem or it's just me? Had no such problems with other cars in the past.

Don't bang too much hopes on the bedding in or lubrication stuff ........ get a proper cleaning (take the rotors out for sanding and lather etc) of the rotors and pads. Clean the handbrake drums as well. Check the calipers.

Visited 3 mechanics for the same problem.......only one bothered to go through all of that and solved the problem.

 

[jinooi]

Re: Sharp screeching sound from brakes at very low speed

:hmmidont::hmmidont::hmmidont:

Sanding your rotors and pads because of the screeching? :yikess::uhhh:

do that and you will effectively make both thinner. and the problem will come back again shortly. :laughlik:

dude, careful with the kind of advice you give...

Don't bang too much hopes on the bedding in or lubrication stuff ........ get a proper cleaning (take the rotors out for sanding and lather etc) of the rotors and pads. Clean the handbrake drums as well. Check the calipers.

Visited 3 mechanics for the same problem.......only one bothered to go through all of that and solved the problem.

 

[Red_Bean_Bun]

Re: Sharp screeching sound from brakes at very low speed

:hmmidont::hmmidont::hmmidont:

Sanding your rotors and pads because of the screeching? :yikess::uhhh:

do that and you will effectively make both thinner. and the problem will come back again shortly. :laughlik:

dude, careful with the kind of advice you give...

Dude, the bedding in stuff is not a cure all either. Go drop dead.

 

[Terry]

Re: Sharp screeching sound from brakes at very low speed

My brakes give me this sharp, screeching sound (the best I can describe it) at really low speed, typically at the point of release of brakes from stop-to-go and sometimes when coming to a full stop at really low speed. For example, during parking where small adjustments have to be made with the car moving and and stopping. This problem is usually more pronounced after the car had been parked for a period of time.

Have gone to the workshop to look into this problem, where they removed the brake pads and chamfered the edges, as well as lubricating parts of the brakes. Still, problem exist.

Is this a common problem or it's just me? Had no such problems with other cars in the past.

maybe something is stuck... some dirt or stone is stuck somewhere behind ur brake disc or ur brake dust cover

 

[jinooi]

Re: Sharp screeching sound from brakes at very low speed

Dude, the bedding in stuff is not a cure all either. Go drop dead.

Tsk, tsk...

Being dumb and ignorant doesn't give you an excuse to be rude.

There are many threads on this, and the topic has been discussed ad nauseam...

So good day to you too!

P.S. Here's a clue - bedding in is something you need to do periodically.

 

[VolanteDB9]

Re: Sharp screeching sound from brakes at very low speed

Dude, the bedding in stuff is not a cure all either. Go drop dead.

li ki si la...

 

[bryan_t]

Re: Sharp screeching sound from brakes at very low speed

maybe something is stuck... some dirt or stone is stuck somewhere behind ur brake disc or ur brake dust cover

not in this instance as all four brakes have been removed for cleaning and same problem still there.

 

[bryan_t]

Re: Sharp screeching sound from brakes at very low speed

i have the screeching sound for my e90 320 since day 1 i collect the new car. went to pml and the answer is that's normal.
the screeching sound is at the point release of brakes from stop-to-go .... very obvious and persistent ... you won't miss it.

One thing that puzzles me is why is it 'normal' for BMW cars? I've owned Ford, Mitsubishi & Toyota cars before and never had this problem before.

 

[jinooi]

Re: Sharp screeching sound from brakes at very low speed

the SA at PML will tell you that the rotors and pads have 'glazed over', which is partly true...

it due to the different compounds used in the pads. that's why your car stops on a dime. it possible that road cars like the ones you have driven are possibly lighter and do not need as much 'stopping power'.

in general, the more aggressive the brake pads, the more 'screechy' they are. ask the guys who have changed their pads to street racing and track pads...

but it doesn't mean your brakes aren't working properly - it's just irritating, that's all...

 

[Red_Bean_Bun]

Re: Sharp screeching sound from brakes at very low speed

Tsk, tsk...

Being dumb and ignorant doesn't give you an excuse to be rude.

There are many threads on this, and the topic has been discussed ad nauseam...

So good day to you too!

P.S. Here's a clue - bedding in is something you need to do periodically.

Don't be childish. Be open minded. Cleaning up the rotors and pads can be done once in a while as well. Stop trying to look smart with your jaw dropping icons. I'm trying to help you not look like a redneck.

If zipping around with your foot on the brake pedal attempting bedding in does not work for one then one should try something else. Accept that ..... If you can't then so be it.

 

[Red_Bean_Bun]

Re: Sharp screeching sound from brakes at very low speed

li ki si la...

Thanks for the translation.

 

[jinooi]

Re: Sharp screeching sound from brakes at very low speed

It's nice to know you are capable of civil conversation, but you can do better by dropping the patronising tone and name calling.

Bedding in does not entail "zipping around with your foot on the brakes".

If you keep an open mind and read the numerous articles that have been written on this topic (and there are quite a few given that is a common complaint), you will discover that rotors and pads do not need cleaning. In fact, cleaning them may effectively shorten the lifespan of your rotors.

Besides, the bedding in process is less of a hassle - you won't have to remove the wheels. Not to mention having to visit the mechanic.

 

[bryan_t]

Re: Sharp screeching sound from brakes at very low speed

ok, I've done one rounding of the bedding in process and so far, for the past 2 days, have found the screeching sound has reduced, at least to a more 'comfortable' level. Will continue to monitor for a few more days and after that, will probably do another round to 'eliminate' the problem.

 

[JLMC]

Re: Sharp screeching sound from brakes at very low speed

ok, I've done one rounding of the bedding in process and so far, for the past 2 days, have found the screeching sound has reduced, at least to a more 'comfortable' level. Will continue to monitor for a few more days and after that, will probably do another round to 'eliminate' the problem.

souind familiar problem just like mine, but for me, it happen after i had my car driven for 1yr.
irritating screech sound like yours whenever I brake to halt, not so much when brake to slow down. (meaning slow speed to stop is very obvious screech)
Boss Motor/Calvin suggested it could be warp rotor. I kinda dont believe at first, so checked ard forums, including E60 USA sites, which some of them told me to do some serious bedding.
Some suggested brake hard at 120kph (of course on clear road) a few times, while some said particles may had stuck on rotors.
I tried braking hard, sound soften, but came back again.
Decided to go to Boss, change rotors n carbon brake pads.
All problem solved! 8)
now happy like sotong! (not to mention like brake dust, n easier to clean if there r dust)

 

[jinooi]

Re: Sharp screeching sound from brakes at very low speed

the simplified explanation for the screeching sound - caused by abrasive brake pads coming into contact with the bare metal of the rotor, kinda like when you rub a squeaky clean plate after washing off all the soap.

when you bed in your brakes, you are transfer a thin layer of the pads which 'melt' and adhere to the rotors (hence the slight tinting of the rotors if bedding in is done correctly), which stops them from screeching, but surprisingly does not compromise on braking efficacy. it's also this layer that wears off first (if it's even there in the first place), and slows down rotor wear.

the reason why you need to bed them in periodically is because like all other things coming into contact with each other, the friction wears off this thin layer and you will need to 'apply' the layer again. you will not need to do this if everyday you drive your car like you stole it, and brake aggressive in your often enough.

the next question you will ask is "doesn't that mean my brake pads wear down faster if i step on the brakes aggressively more often? answer is yes, but i'd rather change the brake pads more often, than have to change the rotors, cos rotors cost much much more...

so the irony is that in the effort to conserve the brake pads and rotors, most people think that they should step lightly on the brakes everytime when coming to a halt, when in fact (in most circumstances) they are accelerating the wearing down process...

 

[Shaun]

Re: Sharp screeching sound from brakes at very low speed

jinooi, why so aggressive? red bean was just talking about his own experience and he is right in saying that it's far from just about bedding-in

the screeching involves many other factors other than bedding in.. you can go around and count the number of cars with totally clean rotors on OE pads that do not screech. Bedding does help when the pad is an aggressive pad, not so when a more street type pad.