Brake Dust?

[s2bear]

Hi all. Fitted new wheels and tyres. After 80 motorway miles the rear wheels only are covered in a dust the consistency of flour. Nothing on the fronts. Just the rears. There’s no rubbing anywhere etc. Are the rears more prone to dust than the fronts?

You can see where the ‘metallic’ dust has adhered to the tyre fitter’s hand prints.

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[WelshGas]

Hi all. Fitted new wheels and tyres. After 80 motorway miles the rear wheels only are covered in a dust the consistency of flour. Nothing on the fronts. Just the rears. There’s no rubbing anywhere etc. Are the rears more prone to dust than the fronts?

You can see where the ‘metallic’ dust has adhered to the tyre fitter’s hand prints.

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Not in my experience. But that doesn’t look like brake dust.

 

[s2bear]

Not in my experience. But that doesn’t look like brake dust.

No, you’re right, it doesn’t. It’s bothering me though as I don’t know why it’s just on the rear wheels or where it’s come from.


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[stuarta]

Have the roads been salted or were you driving near a quarry/construction site - it looks like either salt or clay dust.

 

[s2bear]

Have the roads been salted or were you driving near a quarry/construction site - it looks like either salt or clay dust.

Yes it’s very very fine. Like clay dust I suppose. Maybe I’m worrying unnecessarily, I’m always checking for potential issues after fitting new stuff and it struck me as odd that the front wheels are clean as a whistle. They were only fitted yesterday afternoon.

I’m going to wash it off before the drive home and see if it reappears.
Clean fronts:

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[Ocean Spirit]

I’m going to wash it off before the drive home and see if it reappears.

Best idea I think, fingers crossed.
Nice wheels though

 

[s2bear]

Best idea I think, fingers crossed.
Nice wheels though

Thanks. I’m pretty pleased with them.

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[CampervanTime]

Love these wheels - what are they?

 

[Loz]

Hi all. Fitted new wheels and tyres. After 80 motorway miles the rear wheels only are covered in a dust the consistency of flour. Nothing on the fronts. Just the rears. There’s no rubbing anywhere etc. Are the rears more prone to dust than the fronts?

You can see where the ‘metallic’ dust has adhered to the tyre fitter’s hand prints.

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Were they rorated front to back as that sort if dust level you expect on the front, but if you are loaded up the the brake bias may be causing the rear brakes to work harder.

What does concern me though is the bad etching of the alloy highlighted here.

 

[andyinluton]

How have you checked for rubbing? Jack up the back of the van with the hand brake off & rotate a wheel by hand, that colour dust looks like its coming from the wheel itself, are you sure that the back of the spokes are not touching the brake callipers? maybe only when the brakes are applied.

It it was just the fingerprints, I would have said it was just the powder from the latex gloves the fitters tend to wear.

 

[s2bear]

Hi guys, I’ve can see the spokes are nowhere near the calipers or anything at all - I can get my hand in there and feel the back of the spokes which are clean and smooth. I got under the van and checked the insides of the rims and the tyres to make sure nothing was touching and the tyres are unmarked. The wheels are Vossen CV7 10x20 et45 and I know that plenty of people have put 10.5x20 on the rears without issues and with TUV approval etc. I’m hoping it’s just clay dust from a puddle I reversed into.... What looks like scoring on the wheel isn’t scoring, it’s just where the dust has landed and wipes off clean. The car was driven with hardly any weight in too.


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[s2bear]

Big gap between wheel and calipers/hub. And about a fingers width on the inside of the rim to the plastic wheel well liner - neither rim, tyre or liner seem to be compromised in any way. Will see what transpires and maybe go with a 5mm spacer for peace of mind. Really appreciate all of your feedback, said it before and will say it again - love this place!

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[B J G]

Could just be that with a 20" wheel the brake disc back plate has a much larger open area where air, loaded with road surface dust, can now pass through.
Only way to know for sure would be to extend the back plates.

With the 10" wide rims you'll need to keep making regular checks for inner tyre wall damage and cracked rims.

 

[WelshGas]

Big gap between wheel and calipers/hub. And about a fingers width on the inside of the rim to the plastic wheel well liner - neither rim, tyre or liner seem to be compromised in any way. Will see what transpires and maybe go with a 5mm spacer for peace of mind. Really appreciate all of your feedback, said it before and will say it again - love this place!

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Any more news?

 

[s2bear]

Any more news?

Hi, thanks for asking - no, not yet as it was dumping snow yesterday and P-ing down today so it was washed last night ready to see if anything else appears.

There were no adverse noises en route back (or any other time) and I’m inspecting everything (again) with an endoscope tonight when I get home. Living the dream - my winter evenings just fly by!

Perhaps it is just that the wheel is much more ‘open’ and is effectively a barrel with a propeller at one end so collects more visible ‘stuff’.

One theory is that my wife just keeps sprinkling enough dust on the back wheels to keep me in the garage so she can watch Strictly!

Will keep you posted. Stu


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