[DeTomaso] Chasing the Pantera Braking Solution (Was Proportioning Valve)

Mike Thomas mbefthomas at comcast.net
Sun Dec 11 01:30:57 EST 2011


Thanks, Jim.  No, the pedal moves normally.  Also, I've had my brakes
pressure bled at Les Schwab tires.  The $50 is worth it.
Mike

  _____  

From: Pantdino [mailto:pantdino at aol.com] 
Sent: Saturday, December 10, 2011 5:25 PM
To: mbefthomas at comcast.net; detomaso at realbig.com
Subject: Re: [DeTomaso] Chasing the Pantera Braking Solution (Was
Proportioning Valve)


A bad booster usually gives a very hard pedal that you cannot push down.
Is that what your pedal is like?
 
It IS possible that your tires are just so sticky the stock brake system
cannot lock them.
Remember, the stock brakes were designed for much narrower tires with a less
grippy compound than you are running.
 
Do you have a G-tech or any other way of measuring your actual stopping
rate?
 
Do you have the stock front calipers?  I had the Hall-modified stocks and
had to unbolt it from the stub axle and hold it at different angles while my
wife pumped the pedal to get all the air out of the top portion because the
bleed valve is lower than the top of the cavity inside
 
Jim
 
 



 
-----Original Message-----
From: Mike Thomas <mbefthomas at comcast.net>
To: detomaso <detomaso at realbig.com>
Sent: Sat, Dec 10, 2011 10:43 am
Subject: [DeTomaso] Chasing the Pantera Braking Solution (Was Proportioning
Valve)


I've done just about everything to my stock system that everybody here has

advised:



Rebuilt calipers

Porterfield pads

Braided steel lines

New master cylinder

Replaced the flexible vacuum lines both front/rear

Full pressure bleed at Les Schwab tires

Plus SSBC vented/slotted front rotors, and I'm running 245 front and 315

rear section tires, Khumo Exsta XS, which are quite sticky.



What I don't know:

Whether the booster has ever been rebuilt (rather doubt it)

Whether the proportioning valve has been molested



When I brake, it's still all I can do to get anything to lock up, and when I

get lock, it's always the right front only.  I don't track the car, but even

on spirited twisty drives, the few times I've had to clamp down hard have

left me looking for an anchor to throw out the window to get it to really

STOP.



Questions:

What's involved in rebuilding the booster, and should I consider replacing

the proportioning valve?  I feel like I should pull it to at least see if it

has been tinkered.



Thanks

Mike Thomas

Yellow '74 L #6328



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