Hanging rear caliper

[Ingo Rautenberg]

And IME would only occur with a torn boot BTST...

----- Original Message ----- 
From: "Bernie Benz" <b.benz at charter.net>
To: "Kneale Brownson" <kneale at coslink.net>
Cc: "200q20V mailing list" <200q20v at audifans.com>
Sent: Saturday, April 16, 2005 11:54 AM
Subject: Re: Hanging rear caliper


> Kneale,
> Implying that the external portion of the piston, outboard of the seal,
> could corrode, right?  If so, it wouldn't cause any problem until one
tried
> to retract the piston for new pads.  Any disruption in the smooth chrome
> plated piston sealing surface signifies end of life.
>
> Bernie
>
> > From: Kneale Brownson <kneale at coslink.net>
> >
> > What I wrote, Bernie, was that there COULD be corrosion on the piston,
> > especially if it was extended from the cylinder quite a bit by pad wear.
I
> > said nothing about it falling out of the cylinder.  DFIIIAB.
> >
> > At 08:17 AM 4/16/2005 -0700, Bernie Benz wrote:
> >> Come on, get real, Kneale and Peter!
> >>
> >> Pistons can not extend far enough to drop out of the caliper seals,
unless
> >> one forgets to install the rotor.  Using the passive pad wear
detectors, I
> >> routinely wear my pads down to where the backing plates touch the rotor
> >> ridges.  Further, there is no piston "cocking force", tendency for the
> >> piston to cock or jam within the caliper bore.  They do get sludged up
form
> >> lack of fluid change though.
> >>
> >> Bernie
> >>
> >>> From: Kneale Brownson <kneale at coslink.net>
> >>>
> >>> So, have these gone unserviced for a year and a half?  Did you use
new,
> >>> OEM, or some rebuilt stuff?  You might have corrosion on guide pins or
the
> >>> caliper piston, especially if the pads are worn enough the piston is
> >>> extended quite a bit.
> >>>
> >>> From: Peter Schulz <pcschulz at comcast.net>
> >>>
> >>> Couple of thoughts...
> >>> Ebrake mechanism not fully releasing, or the pads are worn down to
less 1/4
> >>> depth- and the caliper cylinder is extended to the point where its
binding
> >>> on the cylinder walls.  If the Ebrake mechanism and cables are
releasing
> >>> and functioning properly, drive the brake piston completely back into
the
> >>> caliper.
> >>>
> >>>
> >>> -Peter
> >
>
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