Rear Brake Discs

Dan_DJT

Registered User
The friction surface on my rear discs doesnt look too good, pic below. I know there is an issue with rust and I will tidy that up when its a bit warmer. I would expect the friction surface to be a bit more clean from the action of the pads. Would like to see what other owners rear discs look like to know if mine have an issue.
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AudiNutta

Moderator
Staff member
Moderator
Gold Supporter
I don’t have a picture handy where I don’t have surface rust from a wash, but that definitely doesn’t look right.

Go out and give them a bit of a kicking to see if it improves.
 

geo_nr1

Registered User
Exactly the same with mine. Was told all was fine in fact I wasn’t using them enough....yeh right. I’m not happy with that though. Don’t know what else can be done...anything under warranty.


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E

Evil Diesel

Guest
That looks entirely normal to me - a few bits of grit on the pads perhaps but nothing that a spirited drive won't sort out. Is there a performance issue here or is it the aesthetics that is the issue?
 

Dan_DJT

Registered User
Thanks for the replies

Brakes all seem to work fine so it's just an appearance issue at the moment. In the past I have found that when the friction surface rusts or grooves then its not long until it is too much for the pads to clean up.

I will do a few hard stops and see if it clears up a bit, I dare say I am not braking hard enough. I think there is very little rear brake bias on the RS3 to the point that they dont really do a lot.

I had the same issue on my Seat Leon that I had before the RS3 and I fitted new Seat discs and pads. The problem went away then, almost as if the pads/discs used in production are harder than those sold as genuine replacements .
 

Hal Adams

Well-Known Member
VCDS Map User
I fear that you will not achieve much after a few 'hard stops' - in fact you might only increase the grooves! I presume that it is the grooving that you do not like the aesthetics of, yes?

Grooves in discs are down to two factors: foreign objects getting between pad and discs and/or soft metal compound of the disc. Changing out to a different disc/pad combination is the only way to 'clean' them up.
 

Arcam

Registered User
I fear that you will not achieve much after a few 'hard stops' - in fact you might only increase the grooves! I presume that it is the grooving that you do not like the aesthetics of, yes?

Grooves in discs are down to two factors: foreign objects getting between pad and discs and/or soft metal compound of the disc. Changing out to a different disc/pad combination is the only way to 'clean' them up.
^^^^^^^^
This +1

I fitted these Tarox discs to mine:


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Arcam

Registered User
Here is a picture of each rear after road use and 2 days on the Nurburgring.
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Hal Adams

Well-Known Member
VCDS Map User
Can't complain at those, can you? They are pretty well groove free, so Tarox obviously uses a better grade cast material than whoever Audi buys theirs from..:thumbs up:
 

Dan_DJT

Registered User
Been out and done a lot of hard stops, slight improvement to disc surface but not a lot.

Will see how things go, don't want to put new discs on just yet, its only done 2750 miles.

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oli356

Registered User
Not an RS3, but looked at my rear disc this morning... looking goood.... not.
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Arcam

Registered User
The brake bios is mainly to the front so with mild street use the rear brakes do little to no work especially with just the driver with no weight in the rear.

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Spinstorm

Registered User
I hate the rust on the rotors.

I have now done around 4,500 miles on my RS3 and thanks to the lovely weather my rear rotors on the rear are rusting. There is also some rust showing on the front as well although due to the design of the front breaks they are not nearly as obvious.

I will probably have them painted.

I asked the guys at posh wash in london and they also said they could change my standard alloys and make the diamond cut (with the same design as the optional alloys) for around £130 each. I like the diamond cut design more but I also like that the standard alloys are easy to fix if scratched of curbed.
 

oli356

Registered User
Is the discs rusting an 'Audi special' as it is with the hubs? Or common across all manufacturers.
Considering some of the new alloys hardly have any material and you can see straight through the gaps to see the discs.. Well yeah... Not nice sight :(
 

maxpayne

Registered User
This thread piqued my interest and made me look up photos of the old discs that came with our 2005 A3 from new. Despite bing on the car for almost 11 years before being replaced with Pagids (which rusted within a week) they were spotless, both fronts and backs. Is it a case of they don't make em' like they used to or bad fitting? All I know that I'd like to throw off the Pagids and replace them with something else as the rust is really bugging me (the braking is spot on, no problem there haha).
 

Dan_DJT

Registered User
In my opinion discs are made with lower quality metal to reduce costs. I see a lot of VAG cars with rusty hubs. Jaguar paint the hub section and dont have the issue.

When I replaced the discs on my old Seat Leon I also painted the hub and they never rusted. I spoke with the parts guy at Seat and he confirmed that they get a lot of complaints about rusty hubs. He gave me a can of spray (pic below) that covers the rust but doesnt stop it coming through, just delays it. The genuine Seat aftermarket parts also seemed to be a different grade of metal as the friction surface was always clean and shiny vs the rough and grooved that were on the original parts.

I think the only solution is to remove the rust and paint them.

For the friction surface issue my car has it seems that replacement is the only way to fix it.
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Dan_DJT

Registered User
Few more hard stops today and discs are looking a little better. I am obviously not braking hard enough so will have to perfect my late braking technique !! Still absolutely love the car tho, so much fun to drive.
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