brake dics advse needed

[Len]

Unless your car is super powerful and goes at over 150mph then you really dont need grooved discs!

Utter rubbish.
It's not about top speed...it's about how hard you use them, and how hot you get them.

Well I guess in the wilds of Scotland you can go really really fast on open roads but down here that is impossible!
I have been driving as fast as possible for a very long time now and I have never encountered brake fade on normal roads.

[Len]

Note to OP.

If you really feel you need extra braking power why not do the 312mm brake upgrads?

[Khare]

Unless your car is super powerful and goes at over 150mph then you really dont need grooved discs!

Utter rubbish.
It's not about top speed...it's about how hard you use them, and how hot you get them.

Well I guess in the wilds of Scotland you can go really really fast on open roads but down here that is impossible!
I have been driving as fast as possible for a very long time now and I have never encountered brake fade on normal roads.

Obviously not tried going from Bournemouth to Bristol airport on a quiet day with virtually no traffic 

[Ess_Three]

So what is this gas?
Does it actually form a barrier between the disc and pad?

Its the gas layer formed when the pad starts to overheat and break down...it comes from the pad material.
And yes, it forms a barrier between the friction surfaces.
Vent it - via holes or grooves, and you get rid of it.

[Ess_Three]

Well I guess in the wilds of Scotland you can go really really fast on open roads but down here that is impossible!
I have been driving as fast as possible for a very long time now and I have never encountered brake fade on normal roads.

Nothing to do with it.
There aren't too many Mk3s that will do 150 MPH, never mind suffer braking problems associated with high speed braking.
Brakes overheat when you use them hard without enough cooling air to control the temperatures...so repeated hard braking from modest speeds will overheat brakes quicker than brakes with 150MPH whistling past them, cooling them.

It's not about how fast you drive...its a function of how hard you use your brakes, and how much time you give them between doing work, to cool down.

I used to overheat brakes on back roads at 50-80...slowing down to 20-30...as you do on twisty country roads.

So, you can then start to take steps to stop the overheating:
Higher temperature rated pads
Higher temperature rated fluid
Grooved/drilled discs
Brake cooling

[tweed]

I try to stay away from drilled as they do crack.

My kart disc has many cracks 

[Len]

Well I would love to find a road I could do 80 on! Except motorway of course, even then 80 at peak times can be an achievement!
Most roads I travel on you are lucky to do 50.

Still sceptical about the gas.
Gas can only be formed when a material changes state, solid to liquid to gas is the general thing.
So you are saying a solid material goes straight from solid to gas? I have never seen a brake disc red hot so just dont believe this!

[trog_nfs]

Well I would love to find a road I could do 80 on! Except motorway of course, even then 80 at peak times can be an achievement!
Most roads I travel on you are lucky to do 50.

Still sceptical about the gas.
Gas can only be formed when a material changes state, solid to liquid to gas is the general thing.
So you are saying a solid material goes straight from solid to gas? I have never seen a brake disc red hot so just dont believe this!

Its called sublimation. Dry ice is an example of this process, where solid carbon dioxide turns directly into the gaseous form without the liquid intermediate step.

[tweed]

Read this Len

http://en.m.wikipedia.org/wiki/Brake_fade

[sharki786]

Note to OP.

If you really feel you need extra braking power why not do the 312mm brake upgrads?

Well i was thinking about this but as im running bbs rx2's i will nees to shave my calipers down a little bit which i aint fund of doing. Otherwise id love to go 312