I recently went thru this on my '91.  IMHO it would be very difficult
to determine without removing the wheel and the caliper unless you
have both types available for comparison.
  Even with the caliper loose and studying pictures in various on-line
catalogs, I wasn't sure until I scraped and sanded off enough rust to
see the word "Girling".

Larry A.

On Mon, Jan 4, 2010 at 4:05 PM, Jim Felder <jim.felder@gmail.com> wrote:
> I'm wanting to rebuild the front calipers on my 1983 diesel Westy
> soon. Since it's freezing cold here right now, I was wondering if
> there's a n easy way to determine which style--Girling or ATE--that I
> have without removing a wheel.
>
> Jim
>