[DeTomaso] Wilwood Brakes WTF????

[Tomas Gunnarsson]

The fact that virtually all cars on the road uses non-floating rotors
and work well without the RPV indicates that there's something wrong
with the installation rather than a system requirement. If you have
little runout all you get  is slightly dragging brakes.
 
Tomas

<-----Ursprungligt Meddelande----->
From: MikeLDrew at aol.com [MikeLDrew at aol.com]
Sent: 15/4/2013 7:30:32 PM
To: pantera at cox.net
Cc: detomaso at poca.com
Subject: Re: [DeTomaso] Wilwood Brakes WTF????

In a message dated 4/15/13 4 58 23, pantera at cox.net writes:


> I bought a set of Wilwood brakes from one of our local vendors back in
> the 1990s. and when checking the runout ("wobble") of the installed
rotors, 
> several were found to be in excess of 0.050", over 10 times the usual 
> working range.  This will produce the juddering you spoke of.  
> 
>>>I had the same issue, and fixed it by having the rotors turned on the
car. I have zero runout now. The juddering I experienced on the track
was 
short-term, caused by the problem that I had picked up.
> 
> >Thanks again to S O Bill for the help, we spent a lot of time on his 
> lathe correcting the misgivings.  It seems that although the kit was
stamped 
> "Wilwood", the rotors were actually cloned by a pacific rim company,
not 
> sourced from Wilwood.
> 
>>>I have to wonder where my rotors (which came as part of a kit from 
Pantera Performance Center) really come from? I do intend to upgrade
them to 
curved-vane, slotted discs. Just not this week!
> 
> >Also, get rid of the 2 psi residual pressure valves ASAP, they belong
on 
> a car that has the master cylinder physically lower than the calipers,
as 
> in the 'ol T-bucket street rods. They will typically drop the master
brake 
> assy below the floor so as to hide it and present an uncluttered
firewall.
> 
>>>Dennis included them with his kit. I have to say that I drove a 
Pantera that had a Hall JFZ system (which is effectively the same)
without these 
valves, and it suffered greatly from pad knockback. If you drove down
the 
road for ten minutes, the first time you stepped on the pedal it would
go 
halfway to the floor, as the initial travel was used to reposition the
pads 
against the discs. Subsequent stops would deliver a nice, firm pedal,
until 
you drove for some distance without using the brakes. It was very
unnerving 
not really knowing where the braking was going to begin. The RPVs
totally 
eliminate that, which I suspect is why they were included in the system.

There are probably better ways to handle the situation; one would be
fully 
floating rotors. I will probably be upgrading my brakes at some point,
and 
slotted, curved-vane, floating rotors are high on the list, along with 
six-piston calipers.
> 
> >Hope this is of some help.
> 
>>>Indeed!
> 
> >Congrats on the upcoming nuptials, BTW,
> 
>>>Thanks! Have to make sure both Panteras are there to celebrate with 
us!

Mike
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