My discs have chicken pox?

Fr0dders · 15 Jul 2007 at 19:14

Zip said:
Ive never had any of my disks rust

Must be your salty roads

no its the air

Oz isnt exactly a damp climate is it ?

the air in oz is so dry, nothing rusts over there. When ive visted relatives over there, ive seen like 30 year old cars driving round looking brand new. It just doesnt happen over here !

mrk · 15 Jul 2007 at 19:24

wonder_lander said:
Man those wheels are very clean, I'll bring mine over to you to do

Mine? lol

I just wipe mine with a tissue every once in a while, there is no road dirt on there really, it's all brake dust! a quick wipe reveals a shiny alloy with no marks

BigglesPiP · 15 Jul 2007 at 20:12

Brakes are always doing one of 2 things; wearing out, or ceasing up.

Wayn0r · 15 Jul 2007 at 20:16

depends on the material, and if its coated or not.

Most standard discs are one piece iron.

Aftermarket are better quality and coated in anything from zinc, to cadmium.

BigglesPiP · 15 Jul 2007 at 20:19

Wayn0r said:
depends on the material, and if its coated or not.

Most standard discs are one piece iron.

Aftermarket are better quality and coated in anything from zinc, to cadmium.

What are you talking about?

Jonny ///M · 15 Jul 2007 at 20:39

BigglesPiP said:
What are you talking about?

The brake discs are built in high carbon cast iron and they are available either drilled or slotted. The brake discs are then plated for corrosion resistance and for a bold, aggressive appearance.

From the brembo site.....

Wayn0r · 15 Jul 2007 at 21:14

Jonny ///M said:
From the brembo site.....

thank you

As said, the reason cast iron is used is because of the characteristics under high heat and pressure.

Steel/stainless expands a lot under heat, wouldnt be very good on a limited size caliper now would it?

iron can get very hot, and doesnt expand nearly as far as others.

Aluminium doesnt have a high enough temperature threshold etc

Clarkey · 15 Jul 2007 at 21:22

surely any coating will wear off pretty much immediately during braking. Will keep the inner and outer edges looking good though.

Felix Da Housecat · 15 Jul 2007 at 21:26

Zip said:
Ive never had any of my disks rust

Must be your salty roads

Never washed your car then?

Tican · 15 Jul 2007 at 21:37

Felix LaPoubelle said:
Never washed your car then?

http://forums.overclockers.co.uk/showpost.php?p=9706158&postcount=1

Edited: Wrong Link

Wayn0r · 15 Jul 2007 at 22:01

Clarkey said:
surely any coating will wear off pretty much immediately during braking. Will keep the inner and outer edges looking good though.

where not talking micron thick coatings.

EBC mix Zinc with some of their iron discs, aswell as coating some.

Depends on the company, black diamond for instance are heat treated post-machining.

there are hundreds of different ways to reduce disc wear, increas friction blah blah.

the reason OEM dont do this as standard is cost. simple. you only need to look at the cost to upgrade the porkas to ceramic discs to see what im talking about.

Clarkey · 15 Jul 2007 at 22:08

I'll just nod and say yes, I don't know enough about the construction of them. But as for porsche, it's because they know they can get away with charging that much

BigglesPiP · 16 Jul 2007 at 01:27

he brake discs are built in high carbon cast iron and they are available either drilled or slotted. The brake discs are then plated for corrosion resistance and for a bold, aggressive appearance.

"High carbon iron", that's a good one.

The rest of us call that steel.

And a plating (unless really thick) isn't going to hang around. Especially a Zinc Plating.

Tom|Nbk · 16 Jul 2007 at 01:50

squiffy said:
Tried braking?

Rofl.

Hawk Tuah · 16 Jul 2007 at 10:05

BigglesPiP said:
"High carbon iron", that's a good one. The rest of us call that steel.

And a plating (unless really thick) isn't going to hang around. Especially a Zinc Plating.

I thought the plating was to prevent the non contact areas of the disk from going risty. The part where it touches the pads wont go rusty due to wear.

A lot of the fiat guys spray paint their disks all over before putting them on.

Wayn0r · 16 Jul 2007 at 10:09

Bug One said:
I thought the plating was to prevent the non contact areas of the disk from going risty. The part where it touches the pads wont go rusty due to wear.

A lot of the fiat guys spray paint their disks all over before putting them on.

spray paint?!?!!?!?

Hawk Tuah · 16 Jul 2007 at 10:16

Wayn0r said:
spray paint?!?!!?!?

Yep. A silver or black coating (no max power colours

)

First time you brake it comes off of the contact areas, but it will stop the non contact areas from rusting up.

Wayn0r · 16 Jul 2007 at 10:24

Bug One said:
Yep. A silver or black coating (no max power colours )

First time you brake it comes off of the contact areas, but it will stop the non contact areas from rusting up.

suppose it makes sense, just hope its high temp paint

Hawk Tuah · 16 Jul 2007 at 10:35

Wayn0r said:
suppose it makes sense, just hope its high temp paint

For that added sparkle...

BigglesPiP · 16 Jul 2007 at 19:01

Bug One said:
I thought the plating was to prevent the non contact areas of the disk from going risty. The part where it touches the pads wont go rusty due to wear.

A lot of the fiat guys spray paint their disks all over before putting them on.

It's a poor solution to a problem that doesn't exist.

Disks generally don't corrode excessively on the non contact areas before you've worn them out. If you drive properly.

And if you drive properly you'll find paint cant handle the heat.