[Mgs] crossed drilled brake rotors

[Eric Erickson]

On 22/09/2007, at 5:52 AM, Stephen West-Fisher wrote:

> I was under the impression that cross drilling the rotors was done  
> to allow
> the gasses to escape from the high performance pads in use a number  
> of years
> ago, not for heat dissipation. Using the current crop of high  
> performance
> pads, the gas problem does not occur, so the high performance folks  
> I know
> do not use cross drilled rotors. Only the "show car" types do.
>
>

Well I did not go for cross-drilled and grooved/vented rotors for any  
bling factor (no-one can see my discs).

Of course we will never know if these rotors are the reason I have  
not warped another disc in the five or six years since I changed to  
them - but that is the outcome.  Three years of competition and a  
warped rotor using the standard ones and since then no problems.

The track I compete on primarily is VERY hard on brakes with almost  
every corner a hairpin with the back straight braking from 110mph+ to  
25mph (which is where I warped the old disc).

I have no reason to change - and no reason not to recommend others do  
the same as I did.  I use high-performance/metallic pads... and don't  
go through an excessive aount of those either.



Eric
'68 MGB MkII
Adelaide, South Australia