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Calling All MK5 Owners - Surface Rust On Brake Discs On Brand New Car

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#1
Phil_T

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As above since I got the car there is light surface rust on the bit between the back of the wheel & the disk brake its self. Does any other MK5 owner have this?? Also have any owner with a new Mk5 got this too??

If no to the above do you think VW would do anything about it??

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#2
Wayne

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assuming you have washed the car since you got it and from experience on my mk4 this is normal. the discs are high carbon steel adfaik are untreated. the bell  of the discs will get hot and cold aswell as being washed with soaps and detergents, unlike the outer of the discs they are not in constant contact with an abrasive force so the discolouration cant be removed.

one technique is getting the discs powder coated, that way the part of the disc that is in contact with the pads will continue to wear as normal but the rest of the disc wont suffer from the discolouration.

#3
Nelson_R32

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Phil_T said:

As above since I got the car there is light surface rust on the bit between the back of the wheel & the disk brake its self. Does any other MK5 owner have this?? Also have any owner with a new Mk5 got this too??

If no to the above do you think VW would do anything about it??


Phil, the reason the centre of the brake disc rusts is because the discs have high carbon content. High carbon content steel is heat resistant, durable, but tends to rust. It happens on any car but you tend to notice it more on bigger wheeled cars like ours.

It is not a fault of the car, it's a wear and tear part that just gets surface rust. VW won't do a thing about it because it's not a problem.

Stop panicking, start driving :wink:
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#4
Sad Nation

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Yeah I do too but my old BMW had the same as well
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#5
Phil_T

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I know it normally happens on all cars but it is a brand new car so didnt expect it to happen straight away. Also the car has seemed to develop a sqeel at low speeds when stopping and its quite loud but doesnt do it every so often. I thought a stone might be trapped in there but ive gave it a good clean with the pressure washer & its still there. Any ideas to that too as I have read on here others have had it

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#6
Nelson_R32

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Mine squeels like a pig too sometimes in wet weather. Most likely just requires a little copper slip :smile:
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#7
JonnyG

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It is quite common for Mk V to have rusty "bells".  My brand new R32 is just the same unfortunately.  Some people have managed to get their dealer to paint them (but not many, as VW reckon it's normal).

With regard to the squealing, have you checked nothing's trapped between the rear disks and the guard behind them ?  Give the guard a good bang and it may release a small stone or something.
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#8
Rhys

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My bell is slightly discoloured and rusty too, I will be hammeriting the centre hub too! get it all nice silver :]
:creep:................:sheep:

#9
Nelson_R32

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So, the cure is to give your bell a good hard banging and it may release something...?


:idea:
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#10
davefish

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Spray on some very slightly acidic wheel cleaner liquid then go for a short blast with heavy braking. Hey presto, shiney new discs :biggrin:
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#11
Phil_T

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JonnyG said:

It is quite common for Mk V to have rusty "bells".  My brand new R32 is just the same unfortunately.  Some people have managed to get their dealer to paint them (but not many, as VW reckon it's normal).

With regard to the squealing, have you checked nothing's trapped between the rear disks and the guard behind them ?  Give the guard a good bang and it may release a small stone or something.

Ah good so its not just my brand new one that has them, I will have a check of the rears but it did sound like the front pass side where the noise was coming from

Rhys said:

My bell is slightly discoloured and rusty too, I will be hammeriting the centre hub too! get it all nice silver :]

Good thinking, eithier that or I might get them powercoated

Nelson_R32 said:

Mine squeels like a pig too sometimes in wet weather. Most likely just requires a little copper slip :smile:

Do I have to take the brakes apart to apply the cooper slip??

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#12
Phil_T

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davefish said:

Spray on some very slightly acidic wheel cleaner liquid then go for a short blast with heavy braking. Hey presto, shiney new discs :biggrin:

Haha will it actually brake??

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#13
Wayne

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Nelson_R32 said:

So, the cure is to give your bell a good hard banging and it may release something...?


:idea:

wondered how long that would take lol :D

#14
JonnyG

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davefish said:

Spray on some very slightly acidic wheel cleaner liquid then go for a short blast with heavy braking. Hey presto, shiney new discs :biggrin:

I think the OP is on about the "bells" rather than the discs ?


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#15
Nelson_R32

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What can I say; 23 going on 12 :bird:
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#16
DSGlee

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I've had it on both my MK V's and my E92 coupe.  BMW dealer suggested painting with silver hammerite, I did and have now had the BMW 18months, its worked.
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#17
JonnyG

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A few links to previous threads on both of your problems   :idea:

My rusty bits - Tyresmoke Forums

screaching from back wheels
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#18
Phil_T

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Thanks, & yes I was on about rusty bells haha

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#19
andysR32

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Rhys said:

My bell is slightly discoloured and rusty too, I will be hammeriting the centre hub too! get it all nice silver :]

Rhys leave the sheep alone and go see a doctor..lmao:biggrin:
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