[sunscreemer]

Just noticed I seem to have orange gunk all over one of my rear brake discs, the other three are perfectly fine. Any idea what it could be?

[f1swk]

rust

[sunscreemer]

Originally Posted by f1swk

rust

Well, they are a week old!

[F30AM]

I've not used mine for 3-4 weeks and there is not a spot of rust on the discs. I've left it on the street to be assailed by the elements and it's bearing up very well. Even looks clean even though it has never been washed. Tough beauty.

[venkata]

Originally Posted by sunscreemer

Just noticed I seem to have orange gunk all over one of my rear brake discs, the other three are perfectly fine. Any idea what it could be?

You have pics? It has been raining up north here, could that be the cause of the "rust"?

[F30AM]

Originally Posted by venkata

You have pics? It has been raining up north here, could that be the cause of the "rust"?

It has rained here too. If I left my GTI for more than 2-3 days in the rain, the discs would have light rust. Part of the course. So, my F30 is a bit unusual.

[venkata]

Originally Posted by F30AM

It has rained here too. If I left my GTI for more than 2-3 days in the rain, the discs would have light rust. Part of the course. So, my F30 is a bit unusual.

Certainly my E46 and other cars I have noticed when in the car park at work, after it has rained, I could almost guarantee in the evening when going home i would see rust spots on the discs. But these would dissapear after light driving.

[f1swk]

its in where the wheel bolts to the hub, the disc and the hub have no coating any moisture and it rusts, does look like orange spots when it comes out, i took the wheels off treated it then painted it to cure it, another cost cutting job by bmw

[derekh929]

Originally Posted by f1swk

its in where the wheel bolts to the hub, the disc and the hub have no coating any moisture and it rusts, does look like orange spots when it comes out, i took the wheels off treated it then painted it to cure it, another cost cutting job by bmw

Did you use the Bilt Hamber gel for the rust and what all did you paint and did you spray as will will have the wheels off to Ceramic coat when I get it, thanks Derek

[sunscreemer]

No pics, I should have taken one, covered in snow now! Rear right disc is like someone has poured Fanta over it! It's not spots it's like liquid. Other three are fine.

[NISFAN]

Dog pee?

[sunscreemer]

Originally Posted by NISFAN

Dog pee?

VERY well targeted dog pee to just coat the disc and not the wheel and calliper. What do they teach them at dog training nowadays?

[NISFAN]

My discs go rusty within minutes after washing my car. I am thinking one disc got wet somehow

[derekh929]

Originally Posted by NISFAN

My discs go rusty within minutes after washing my car. I am thinking one disc got wet somehow

I think they are getting at hub part used to come painted but know bare metal so rusting quick and dripping onto disk , after I way my car I run up drive and dab brakes then into garage saves the rust on disks

[NISFAN]

Originally Posted by derekh929

I think they are getting at hub part used to come painted but know bare metal so rusting quick and dripping onto disk , after I way my car I run up drive and dab brakes then into garage saves the rust on disks

Ah OK, well mine has M Sport brakes pack with ally bells, so zero rust.

But yes, I also roll mine forward too with brakes on to clear the rust after washing. Sticks the pads to the disc otherwise.

[derekh929]

Originally Posted by NISFAN

Ah OK, well mine has M Sport brakes pack with ally bells, so zero rust.

But yes, I also roll mine forward too with brakes on to clear the rust after washing. Sticks the pads to the disc otherwise.

That's great news I forgot about the alloy bells mentioned in another thread re weight of performance brakes glad I speced know one less job to do, aye the brakes did stick bad if I forgot to give it a run great minds think alike

[f1swk]

Originally Posted by derekh929

Did you use the Bilt Hamber gel for the rust and what all did you paint and did you spray as will will have the wheels off to Ceramic coat when I get it, thanks Derek

I took the wheels off, wire brushed the rust off on the disc hub and the hub itself then coated it with dinitrol rust converter,primer then gloss black.
leaving the rust in there speeds up the corrosion of the alloy wheel, copperslip on the surfaces and bolt threads before the wheels went back on

[derekh929]

Originally Posted by f1swk

I took the wheels off, wire brushed the rust off on the disc hub and the hub itself then coated it with dinitrol rust converter,primer then gloss black.
leaving the rust in there speeds up the corrosion of the alloy wheel, copperslip on the surfaces and bolt threads before the wheels went back on

Thanks Copper always a must as hard to get the wheels off with salt air and alloys as well never heard of the dinitrol will have a look, good news is mine will be alloy I forgot about that, aye cost cutting not a good idea if it causes complaints

[f1swk]

Originally Posted by derekh929

Thanks Copper always a must as hard to get the wheels off with salt air and alloys as well never heard of the dinitrol will have a look, good news is mine will be alloy I forgot about that, aye cost cutting not a good idea if it causes complaints

http://www.rejel.com/rejel-store/cat...ctid/9575.aspx

[derekh929]

Originally Posted by f1swk

http://www.rejel.com/rejel-store/cat...ctid/9575.aspx

Thanks that looks handy for a couple of jobs I have to do

[sunscreemer]

During the journey to work today it's gone :-)

[JOHNBMWM5]

Originally Posted by sunscreemer

During the journey to work today it's gone :-)

IT'S just surface rust will go after every brake use, more pronounced on the Sport upgraded brakes, mine rust every week gone in flash as I brake, no worries