Not sure to post here or fast&furious
I own a bmw 3 series G20, recently decided to change the front brake pads outside rather than the usual bmw SC
However since changing it, firstly there is brake squel usually after driving for few minutes . It squeal when you brake lightly , and also sometimes even without braking you get very light squel as if something just touching . For some reasons when you just started driving the car it doesn’t have this , only after probably at least 5 minutes of driving .

Secondly I get knocking noise when braking as well. When the car is parked and engine is on when you step the brakes all the way down you get a knock when you depress the brake fully .
Also another time is after driving a while you reverse and the first braking attempt when you reverse definitely a knock
But the knocking noise at parked when engine is on is not there when you off the engine.
The brake pads according to the workshop is original bmw .
But I realized the part number is different from the part number shown online when I check using VIN
I was given part number 34106860019
While online check using chasis shows 34116890553

Not sure if these 2 are the same , as a workshop said one could be old part number another is new



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Dunno. I drive Axia. Axia very peaceful car. No such problem

T20 problem

go back to the person who sold you the brake pad and ask

Well he opened up 3 times d still got noise

Damn, exactly what i faced.

A - upon assembly not tighten properly with the brake lines
B - Cap ayam brake pads..
C - Caliper off with rotor

don't think opening it up would resolve the problem when part number is different
it's either that or his installation got problem

these german stuff really need precision in everything...from the correct part to the way it's installed
u go back SC, they'll even plug in the computer after changing your brake pads

Ask them put back ori see same prob or not

1st.. brake pad u order your own and bring to workshop to change ? Or workshop sendiri order?

2nd, did you giv your VIN number before ordering?

Maybe your workshop cao k la..

Buy g20 under warranty?
If yes then do all at SC
If can't afford then axia ftw

By right he said it’s bmw brake pads


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Must change car like that.
My fren also kena
After change new car very hepi problem solve

Try applying some brake cleaner and see whether it works.

Cao k is ?
I wanted to give him he said no need he is very familiar
But browsing online I found this
https://www.loyalparts.com/shop/bmw-34-10-6...ake-pads-front/

Seems both part numbers are interchangeable ?

Bmw no cover brake pad and rotor and wiper ad

Brake cleaner will it work? Coz he took out and I don’t see any obvious foreign bodies
Since did not change rotor
Is skimming rotor a good start ?

Different brake calipers has different brake pads compatibility.

https://www.brembo.com/it/Varie/RACING%20PA...gue%20(012).pdf
https://www.brembo.com/en/Varie/Braking%20S...Performance.pdf

Keyword is to find the brake pads compatible to your brake caliper.. abit lari you'll pay the price hefty

I'm using brembo gt6 and gt4.. the brake pads hard to find

https://www.m3post.com/forums/showthread.php?t=1855569

This post has been edited by exorthexquas: Dec 8 2023, 09:18 PM

Mileage of ur car ?

70k

Try one by one first. Start by the cheapest option. If cannot, then skim. Still can't, then change rotor, etc etc.

Example of finding the brake pads compatible to your brake kid
https://www.zeckhausen.com/catalog/index.php?cPath=82_1542

Actually I asked to change to exact sc spec
Anyway if your theory is right by right skimming should help ?

write so long long- i setel your problem;

how much u want sell your car ?

rm50k, can ?

If u dun racing here n there, nornal driving, the rotor can tahan 100k one before needing to change 1..

Before change dun have, after change only have ?

That mechanic is u first time visit? Got check review before?

Skimming just removes the outer layer of the rotor to remove rust etc.. imho it's just an interim issue.
I also drive a performance car.. but i also face similar issue.. i found out brake pads and brake caliper need to be compatible.. dont beat to cut the cost.
I also face when slow brake you can hear a screeching sound when your pads gripping the rotor.

That issue is between rotor, caliper and pads.
Don't look at the brake lines not related one

Checked review
By right bmw does 2 brake pads for every 1 rotor
Front first time changing pads can reuse still

Rear differnt story la coz every 15k will the pad will due

Installer forgot to apply brake grease behind the pads and piston callipers

Installer forgot to apply brake grease behind the pads and piston callipers

Skimming is just to remove the most outer layer of the rotor due to did not kena brake pad makan, so the outer side layer will protude out and sometimes will kena the brake pad punya metal base.. so skim to level it

But knocking sound all this then you need to check properly..

I’m trying to troubleshoot
One possibility is the rotor lips , is touching the brake pads just slightly ?
And knocking is because the lip is touching the pad , so when you brake it sort of jumps from the lip onto the disc bed ?
Possible ? If yes then skimming will help

Yea 2 and change 1 is correct..
So u 70k.. this is 2nd lo?

I had the same problem before.

my mechanic adviced me, if you're changing brakes, make sure to change the "same pair" of pads and calipers and mount (forgot the name). it could very well be like what your mechanic said - old and new part no, but your other brake parts might not be fully compatible. blame bmw for this.

i learned the hard way - brake stopped working when you really need it to work. changed the whole thing and don't change mechanic shop.

Does applying behind the pads help ? He did put at the caliper piston and the pin holder end d
The back of pad no la

So what shall I do now

First time changing for front so yes 2nd
By right next change will need to change rotor

Sell your car to me la. Rm55k cash

mind if i ask which website do you use to find your parts number?

who knows really. it's a beemer. shit problems like this is common and regular for pretty much everybody.

the squeel should go away after all the rusts dah hilang. but if it doesn't, maybe realigning the brake parts like calipers might help. macam cabut pasang balik. i'm not a mechanic lah so I dunno, I'm just using PC logic lel.


last time i find that jamming the brakes hard can hilangkan the squeel sound.

Conti car
Lol

If don't want to change to axis, spray wd40 on brake pads to lubricate.😄

kesian

I had a similar issue after replacing my brake pads from workshop outside. Then during my usual service the SC told me the brake pad was installed wrongly ( terbalik or inside out ).
According to SC it’s a common issue when customer replaced their brakepad outside. Cost me RM 300 for SC to remove and reinstall the brake pad in the end. But the workshop then pay me back this RM 300 after I show them the video took by SC.

Nani? Drive BMW cant afford the service?
Kalau kepala kecil baik naik myvi aja

What the? What do you mean terbalik bro
Do you mind PM me the video ?

All these symptoms I suspect is due to 1 single issue