[DeTomaso] Front Brake Caliper Piston Sticking

[Larry - Ohio Time]

Let's not also forget at one time the master cylinder rods were a bit long
and with some heat they would apply the brakes. You can test this by getting
the breaks to drag/lock up then loosen the bolts to the master cylinder to
see if they unlock.

Larry - Cleveland



-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Jack DeRyke
via DeTomaso
Sent: Tuesday, December 29, 2015 3:51 PM
To: guido_detomaso at prodigy.net; detomaso at poca.com
Subject: Re: [DeTomaso] Front Brake Caliper Piston Sticking

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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