[DeTomaso] Aftermarket Master safety issue

[Ken Green]

Regarding pedal effort, I've been doing some reading, and in the S A Designs book on brake systems, they say the most power breaks have a pedal ratio in the 4:1 range, and manual brakes are in the 6:1 range.  So going to a large dia MC and staying with a higher ratio (I'm assuming the stock Pantera pedals are closer to 4:1, but haven't checked), would create a difficult brake pedal.
 
Ken
 


--- On Tue, 9/2/08, Sean Korb <spkorb at gmail.com> wrote:

From: Sean Korb <spkorb at gmail.com>
Subject: [DeTomaso] Aftermarket Master safety issue
To: "panteras" <detomaso at realbig.com>
Date: Tuesday, September 2, 2008, 10:13 AM

Hi Pantera land,

I've found a problem with my brake booster, and I'm considering sending
it
off to the guy at brakeboosters.com but I discovered an issue while I was
doing a diagnosis.

My brakes were staying on and the pedal remained depressed after I lifted my
foot from the pedal, and would eventually return to the normal position.
This caused the brakes to drag and heat up my rotors a little though it
would generally only hold for 7 or 8 seconds.  I thought this could be
caused by the master or possibly a frozen caliper, but it could also be the
booster so I disconnected the vacuum source and took it for a test drive.

I have the aftermarket SVO Mustang aluminum master with the adapter on my
Pantera with the 1 1/8" bore and I could stop the car, but just barely
without the power assist.  It stopped straight and didn't exhibit the
problems I was seeing with the booster, so a replacement is called for.

I can bench 400 lbs with my right foot and I can't lock the brakes up front
or rear above 10MPH!

Since stock bore is 7/8" is it safe to assume that running with no booster
makes the car unsafe if you are using a 1 1/8" bore master?  Maybe
it's
because my tires are too sticky or my new Porterfields aren't grippy, but
this would be very scarry at highway speeds.

sean

-- 
Sean Korb spkorb at spkorb.org http://www.spkorb.org
'65, '68 Mustangs, '68 Cougar, '78 R100/7, '59 Austin A35,
'71 Pantera #1382
"The more you drive, the less intelligent you get" --Miller
"Computers are useless. They can only give you answers." -P. Picasso
_______________________________________________

Detomaso Forum Managed by POCA

Archive Search Engine Now Available at http://www.realbig.com/detomaso/

DeTomaso mailing list
DeTomaso at list.realbig.com
http://list.realbig.com/mailman/listinfo/detomaso