[DeTomaso] Pantera - Brakes - Proportioning Valve

Tomas Gunnarsson guson at home.se
Fri Dec 9 11:57:23 EST 2011


Disconnect vacuum line to booster and see if there's any difference. If no,
then you currently only have brakes, not power brakes and that'd explain a
lot.

Tomas

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of MikeLDrew at aol.com
Sent: den 9 december 2011 16:59
To: rickrows at hotmail.com; wkooiman at earthlink.net; detomaso at realbig.com
Subject: Re: [DeTomaso] Pantera - Brakes - Proportioning Valve


In a message dated 12/9/11 7 50 6, rickrows at hotmail.com writes:


> What about the proportioning valve?    Remove, gut, leave as is?
>

Leave as-is.   Gutting or removing it will unbalance your braking system,
making the front brakes overly sensitive.   For gentle driving it feels like
an improvement, because the car stops with less pedal effort.   But if you
seriously need to stop, now your front brakes lock prematurely and your rear
brakes (which do a higher-than-normal amount of the car's overall braking
due to the rearward weight bias) do little at all.

Nobody else has mentioned that your power brake booster could be shot (or
not getting proper vacuum).   The Pantera relies on power assist for proper
braking; if that part of the system takes a dump, your leg doesn't have
enough mechanical advantage to let the stock master cylinder lock the
calipers.

It's difficult to pinpoint the source of your problem from a distance, and
it's annoying to spend money replacing a component, only to learn that it
wasn't the offending one. :<(

Mike
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