Brakes...

["Peter L. Krause" <pkrause@domain.elided>]

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Listers,
    Please forgive me if I've imported this incorrectly...

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Greg, need to stick to "engineering" commentary instead of tackling historical authenticity ;)... The front brakes on the '63 Giulia, as well as most all of the GiuliettaNormale and Veloce (except the coachbuilt variants such as the SS andthe SZ) were of the two-shoe, spiral finned variety. The front shoes had
aluminum castings upon which the friction material was riveted. The rears
employed a circumfrentially finned, somewhat narrower drum with two shoes
made out of stamped steel, again with the friction material riveted to the
shoes. Upon introduction of the SVZ (Sprint Veloce Zagato), the "helical"
larger and wider drums were incorporated on the front with a complex, but
efficient three shoe arrangement (using six wheel cylinders per axle!?!)
requiring substantially greater attention but, along with the greater 
"swept area" of the friction material to the drum, greater stopping power
as well. With the introduction of the Giulia Sprint Speciale (production of 
which trickled on into 1965, right JH?), the previous larger spiral finned
drums and alloy shoes from the front were adopted for the back of front 
disc braked cars (Giulia Veloce variants, including the SS...).

The substantial majority of early (pre-62) cars that come into our shop
are equipped with the alloy two-shoe, spiral finned fronts with the smaller
steel-backed shoes (with narrower alloy drums) in the back, whether Normale
or Veloce. The two Sprint Zagatos recently have been of the three-shoe
variety on the front. The Giulia Spider Veloce had discs in the front, the 
larger drums in the back, although I've heard of three shoe brakes put
on the front of non coachbuilt Giulietta Veloces in the 60, 61 and 62 range
of manufacture. A common "vintage racing" upgrade is the three-shoe on
the front, the larger two-shoe on the back, but as a prep shop for one of 
the quickest vintage Giuliettas in the country, the two-shoe arrangement
works fine on the front (with lots of maintenance....) The three-shoe is
just too much of a pain. The latest carbon metallic shoe material heats
the steel sleeve in the front drums so much, it actually "twists" in the 
alloy casting of the drum, causing the fixing rivets to "tear" the steel
sleeve at the three fixing points at the outermost point of the drum.
With the adoption of the Ferodo MZ 41 material available through Alfa Stop
and Portello (California, USA), we have observed a decrease in pedal
pressure required to stop the car and increased life with less adjustment
required between sessions (this is with 130 to 140 bhp 1300 cc cars with
significant terminal velocity!)

The answer to the fellows original question then is that to be proper, the
spiral finned (labeled sinstro and destro for those of us who are dir-
ectionally challenges) alloy shoed two-shoe fronts would be correct and
function properly on his Giulia Normale (or Abnormale, should he decide
to go that route.)

Anyone care to elaborate? Mr. Hertzman?

- -Peter Krause 
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