[DeTomaso] Vacuum booster

[Rob Dumoulin]

Thanks J.  By "heavily upholstered front trunk" do you mean shag carpet?
 I'm surprised mine didn't have it to match my corduroy interior inset
panels (long story).

You bring up an interesting question.  Do stock Pantera vacuum-assists have
any residual pressure?  If my car were currently running (same long story),
I guess I could check.

Rob

On Wed, Jun 15, 2011 at 6:24 PM, <JDeRyke at aol.com> wrote:

> In a message dated 6/15/11 12:16:59 PM, rob at dumoulins.net writes:
>
> J, Can you be more specific?  Is the conversion written up somewhere?
>
> Not that I remember, but installation only consisted of unbolting the
> stocker, bolting the Byars conversion in its place, and fabricating two new
> brake lines to fit the GM master cylinder. The Byars conversion involved
> them chopping the 4-stud GM mounts off the booster, welding three new metric
> studs in place to match the original Pantera mount, then gold-alodine
> coating. Uses stock nuts, washers and the stock pedal pushrod. It fit but
> was close on our early L where the inner wheelwell edge snuggles up to the
> brake booster cannister. On some cars with heavily upholstered front trunks,
> this is the only area where you might need a small dent. The aluminum GM
> master cylinder has a built-in 2 lb  pressure-hold valve to the front
> calipers, saving the cost of adding one.
> The two fabricated lines take SAE flairs, not Euro bubble-flairs; they need
> to be fabricated because the two outlets are both on the inner fender side
> of the master cylinder, which does NOT protrude at an odd angle nor stick
> further into the front trunk space than stock. Finally, paired with certain
> clutch master cylinder adaptions, the slightly larger dia. brake booster
> gets very close, and a little file-fitting might be needed. My aluminum
> Girling clutch master fit unaltered as did a stock iron MS, but there are
> many such combinations possible.
> Incidently, it's been in our Pantera for 6 yrs; 2 yrs after I installed it,
> the plastic vacuum exhaust valve housing cracked for unknown reasons
> (protrudes into the cabin thru a big hole; I might have done it myself) and
> Byars overhauled it free of charge. GOOD service! FWIW- J DeRyke
>