Help please!

[Olicobs97]

New to the forum and need some advice. 
 

I’ve owned a 2022 A3 Saloon for around 1.5 years and have , since owning it, had an annoying sound when braking.

the sound is a light grinding sound, almost like a scrape (without the squeal of dying brake pads) which appears when braking at low speeds (5-0mph). The sound isn’t too bad when the car is cold, but once driven for more than 10 mins it appears and gets worse in stop start traffic.

 

i raised this with the Audi dealer when I picked it up and they said it was normal. I’ve since driven other A3’s of the same year and different Audis and none have this issue. 
 

I mentioned this again at its first service. Dealer advised that the front brake pads have 40% left and therefore should be changed and is likely the cause of the issue. I hesitated as the sound is very clearly only coming from the rear of the car. We changed the brake pads ( to the sum of £300!) and the issue went away for about 30 miles then reappeared . (I assume they oiled the back brakes maybe?) 

 

The car is in for its second service and I have requested that they look at this issue again. They have, and say that their technicians can’t notice anything but then said that they are aware that the auto gearboxes can create this noise. 
 

Im going tomorrow to take a technician out for a ride along to show them the issue, however  I can’t understand how the sound, which only appears when breaking and is pinpointed to the rear brakes (even had someone stand outside the car who could hear it from the rear wheels).

does anyone have any ideas? I’m not happy with taking the car away again with this persistent issue, or them saying it’s one thing, paying for a fix and then it still persisting.

thanks! 

[Olicobs97]

Hi there. The noise started from new, and once the front disks were changed as per the technicians advice last year, the noise returned again after about 30 miles. (I can only assumed they greased the rear brakes and this then wore off). 
 

I’ve since driven the car another 7000 miles since the front brake pad change and this sound coming from the rear still continues. 
I don’t beleive it’s to do with the gears as it’s noticeable in first gear when coming to a slow stop from 10mph to standstill. 
it only happens when brakes are applied and can be felt in the pedal too 

[Olicobs97]

Sorry and to add. Technicians looked at it today but said they can’t notice anything. I don’t believe this as it’s incredibly noticeable and am therefore taking them on a drive tomorrow to show them. 
the car is at around 35,000 miles and has done this since I first got the car (1.5 years ago) 

[Stevey Y]

2 hours ago, jasonj said:

Hi Ollie , Hi and welcome ! 

1: You mention you have only driven this vehicle 30 Miles from the New Brake Pads having been fitted . Is that correct ?

1a: Brake Pads have to ( Bed In ) which means they have to mould to the Discs ( Rotors ) 

1b : If the pitch ( sound) does not decrease with use and increase then this may lead to other possible causes for this noise . These being  brake mounting clips making contact, not enough Copper Grease on the back of the Pads ,  etc .

1c : May need new Discs ( Rotors )? 

1d: May  be Parking brake not retracting enough ?

2: You will have to establish if this sound happens when you apply the brake ? or  

2a : Is it a result of the vehicle changing down in gears ? 

3: If the Technician is making assessment, tomorrow  he will advise ?

4: You do not mention how many miles this car has ? Jasonj 

 

Your ignorance of braking systems is breathtaking, no one uses copper grease on the backs of brake pads as they come with a thermo rubber coating on the back, this attaches itself to the piston, especially on rear callipers and the other slave side of the calliper, provided both sides are clean when assembled the coating heats and becomes soft allowing both sides to embed slightly, so when the whole thing cools after first use the pads become semi attached to their mating surface points, this means when the piston retracts both pads will follow the mating surfaces back to their protocol positions, [START], furthermore it also stops brake squeal. You seem to have a surfeit of Americanisms which I believe may be a product of to much YouTube/Google, in thirty odd years with cars we have always called them DISCS.