[DeTomaso] Caliper rebuild kits...

[jderyke at aol.com]

Steve, cheap kits with new square sealing rings and boots are available for both ends from all the Pantera vendors. But there's a 50:50 chance that a kit will NOT fix the leakage either front or back. The reason is, many Pantera owners simply refuse to do preventative maintenance on their cars. All British Girling calipers use nickel plated mild steel pistons (clue: OEMs are magnetic), so old water-soaked brake (and clutch) fluid rusts them like a neglected bumper. Once the iron cylinders or steel pistons are pitted, all is lost for cheap repairs. Honing the cylinders oversizes the calipers for normal kits, which develop 1300 psi during hard braking. Adding a kit to pitted components will tear up the new seals almost instantly. Girling no longer offers new pistons or cylinders and a very few shops make such things. Porsche rebuilds their early piitted pistons by chemically stripping the plating, welding up pits, grinding back to size, plating with copper and polishing, then top-plating with chrome or nickel. Obviously, when reconditioned or billet pistons are found, they are very expensive. Larry Stock reconditions OEM brake calipers but if class rules allow, you'll be far ahead to upgrade to modern lightweight aluminum calipers with stainless steel pistons, neither of which will rust. Good luck- J DeRyke


-----Original Message-----
From: Steve Lisa <stevelisa at patentit.com>
To: List DeTomaso Forum <detomaso at server.detomasolist.com>
Sent: Fri, May 18, 2018 9:33 am
Subject: [DeTomaso] Caliper rebuild kits...


All, we are at PIR testing and sn5533 front calipers are leaking at the
piston seals.A We have no spare o-rings or rebuild. Are there any
common/close size o-rings that we can get an the auto part store that
will work in the '73 front calipers?
Regards,A
Steven G. Lisa, Esq.A
Email: SteveLisa at PatentIt.comA
Direct:A 312-320-5888
Scottsdale OfficeA |A P:A 480.535.6656A |A A F:A 480.535.6628A
|A A A:A 7689 East Paradise Lane, Suite 2, Scottsdale, AZ 85260
Chicago OfficeA |A P:A 312.752.4357A |A A F:312.896.5633A |A A A:A 55
E. Monroe Street, Suite 3800, Chicago, IL 60603
[1]www.PatentIt.com
This email is intended only for the recipient above, and may contain
confidential and privileged information. If you received this email in
error, please destroy it and indicate such by return email to me. Thank
you.

References

1. http://www.PatentIt.com/
_______________________________________________


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-------------- next part --------------
   Steve, cheap kits with new square sealing rings and boots are available
   for both ends from all the Pantera vendors. But there's a 50:50 chance
   that a kit will NOT fix the leakage either front or back. The reason
   is, many Pantera owners simply refuse to do preventative maintenance on
   their cars. All British Girling calipers use nickel plated mild steel
   pistons (clue: OEMs are magnetic), so old water-soaked brake (and
   clutch) fluid rusts them like a neglected bumper. Once the iron
   cylinders or steel pistons are pitted, all is lost for cheap repairs.
   Honing the cylinders oversizes the calipers for normal kits, which
   develop 1300 psi during hard braking. Adding a kit to pitted components
   will tear up the new seals almost instantly. Girling no longer offers
   new pistons or cylinders and a very few shops make such things. Porsche
   rebuilds their early piitted pistons by chemically stripping the
   plating, welding up pits, grinding back to size, plating with copper
   and polishing, then top-plating with chrome or nickel. Obviously, when
   reconditioned or billet pistons are found, they are very expensive.
   Larry Stock reconditions OEM brake calipers but if class rules allow,
   you'll be far ahead to upgrade to modern lightweight aluminum calipers
   with stainless steel pistons, neither of which will rust. Good luck- J
   DeRyke
   -----Original Message-----
   From: Steve Lisa <stevelisa at patentit.com>
   To: List DeTomaso Forum <detomaso at server.detomasolist.com>
   Sent: Fri, May 18, 2018 9:33 am
   Subject: [DeTomaso] Caliper rebuild kits...
   All, we are at PIR testing and sn5533 front calipers are leaking at the
   piston seals.A We have no spare o-rings or rebuild. Are there any
   common/close size o-rings that we can get an the auto part store that
   will work in the '73 front calipers?
   Regards,A
   Steven G. Lisa, Esq.A
   Email: [1]SteveLisa at PatentIt.comA
   Direct:A 312-320-5888
   Scottsdale OfficeA |A P:A 480.535.6656A |A A F:A 480.535.6628A
   |A A A:A 7689 East Paradise Lane, Suite 2, Scottsdale, AZ 85260
   Chicago OfficeA |A P:A 312.752.4357A |A A F:312.896.5633A |A A A:A 55
   E. Monroe Street, Suite 3800, Chicago, IL 60603
   [1][2]www.PatentIt.com
   This email is intended only for the recipient above, and may contain
   confidential and privileged information. If you received this email in
   error, please destroy it and indicate such by return email to me. Thank
   you.
   References
   1. [3]http://www.PatentIt.com/
   _______________________________________________
   Detomaso Email List is not managed by POCA
   Posted emails must not exceed 1.5 Megabytes
   DeTomaso mailing list
   [4]DeTomaso at server.detomasolist.com
   [5]http://server.detomasolist.com/mailman/listinfo/detomaso
   To manage your subscription (change email address, unsubscribe, etc.)
   use the links above.
   Members who post to this list grant license to the list to forward any
   message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.

References

   1. mailto:SteveLisa at PatentIt.comA
   2. http://www.PatentIt.com/
   3. http://www.PatentIt.com/
   4. mailto:DeTomaso at server.detomasolist.com
   5. http://server.detomasolist.com/mailman/listinfo/detomaso