[DeTomaso] Front Brake Caliper Piston Sticking

[jderyke at aol.com]

It will not get better by itself. Many times, a piston sticks from simple varnish build-up in the caliper bore. Use blocks of wood cut to size to block piston pairs and a c-clamp, then push the offending piston out. Use Scotch-brite (red or green) to hand-poilish the bore and the piston free of varnish. This is a no cost, low-tech but extremely sloppy job! 

A complete rebuild may not be necessary unless the thing also leaks, but rebuilding only amounts to replacing the square-edge o-ring in each caliper bore plus the dust boot with fresh rubber. All the vendors stock the rebuild kits, which are cheap. Varnish forms inside from the combo of water & unchanged brake fluid over time, especially in long-parked Panteras.
Good luck- J DeRyke

 

 

-----Original Message-----
From: Guido deTomaso <guido_detomaso at prodigy.net>
To: De Tomaso List <detomaso at poca.com>
Sent: Tue, Dec 29, 2015 10:48 am
Subject: [DeTomaso] Front Brake Caliper Piston Sticking


   Very recently noticed the left front brake is late to apply and late to
   release, causing significant swerving.
   Was thinking it might "limber up" with additional driving, now
   wondering if more driving will only make it worse.
   Got to Alameda and back + San Ramon and back earlier, both ~100 mile
   round trips, no issue.  This started after that.
   Am signed up for a multi-hundred mile event on the first, been too cold
   and rainy to do any tinkering.  So maybe I get stranded with a locked
   wheel.  Or the problem just goes away.
   Thoughts, predictions, experience ?
   Thanks,
   GD
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-------------- next part --------------
   It will not get better by itself. Many times, a piston sticks from
   simple varnish build-up in the caliper bore. Use blocks of wood cut to
   size to block piston pairs and a c-clamp, then push the offending
   piston out. Use Scotch-brite (red or green) to hand-poilish the bore
   and the piston free of varnish. This is a no cost, low-tech but
   extremely sloppy job!
   A complete rebuild may not be necessary unless the thing also leaks,
   but rebuilding only amounts to replacing the square-edge o-ring in each
   caliper bore plus the dust boot with fresh rubber. All the vendors
   stock the rebuild kits, which are cheap. Varnish forms inside from the
   combo of water & unchanged brake fluid over time, especially in
   long-parked Panteras.
   Good luck- J DeRyke

   -----Original Message-----
   From: Guido deTomaso <guido_detomaso at prodigy.net>
   To: De Tomaso List <detomaso at poca.com>
   Sent: Tue, Dec 29, 2015 10:48 am
   Subject: [DeTomaso] Front Brake Caliper Piston Sticking
   Very recently noticed the left front brake is late to apply and late to
   release, causing significant swerving.
   Was thinking it might "limber up" with additional driving, now
   wondering if more driving will only make it worse.
   Got to Alameda and back + San Ramon and back earlier, both ~100 mile
   round trips, no issue. This started after that.
   Am signed up for a multi-hundred mile event on the first, been too cold
   and rainy to do any tinkering. So maybe I get stranded with a locked
   wheel. Or the problem just goes away.
   Thoughts, predictions, experience ?
   Thanks,
   GD
   _______________________________________________
   Detomaso Forum Managed by POCA
   Posted emails must not exceed 1.5 Megabytes
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   use the links above.

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