[s-cars] Sticky Big Red

[Tom Green]

Did you have a chance to inspect the brakes while the wheels were  
being checked for
balance?  You don't mention any intervening maintenance since the  
brakes were
installed 5 yrs/30K miles ago.  It's certainly time for a fluid flush,  
exterior cleanup and
inspection, and perhaps a pad change.  If they are one piece rotors,  
turning them to
provide a new and true bedding surface for new pads is a good idea.   
If the pads are
worn 1/2 or more, the reposition of the piston may be all that is  
needed along with the
new fluid, but if the pistons are out that far you might be advised to  
check behind the
dust boot to make sure the pistons are clean and add a little plasti- 
lube to insure they
retract smoothly when resetting for new pads.

Then clean and inspect the brakes at least yearly and flush the fluid  
at least every two
years.

Tom '95 S6
          '95.5 S6 avant
Knoxville, TN

> -----Original Message-----
> Date: Mon, 7 Jun 2010 10:16:42 -0700
> From: Martin Kozaczek <mkozaczek at gmail.com>
> Subject: Re: [s-cars] Sticky Big Red
> To: Abe Berman <yellowcuda at gmail.com>
> Cc: s-car list <s-car-list at audifans.com>
> Message-ID:
> 	<AANLkTilHqJpT3apSTxEfyJ0goZq8B9FwRMlw0kiQ_1Dp at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> I've read that some have had luck with taking the caliper off  
> (easier to
> work this way) removing the seal or boot whatever it's called, then  
> cleaning
> out the piston bore with liberal amounts o WD40 or equivalent,  
> clearing out
> with compressed air and reassembling.
>
> My calipers were new so I didn't bother, just sent them back.
>
> On Mon, Jun 7, 2010 at 10:01 AM, Abe Berman <yellowcuda at gmail.com>  
> wrote:
>
>> Thanks for sharing Martin.
>>
>> Hmm, guess I should check the archives.  I am hoping (read:  
>> praying) that I
>> don't need to replace the caliper(s).
>>
>> On Mon, Jun 7, 2010 at 12:40 PM, Martin Kozaczek  
>> <mkozaczek at gmail.com>wrote:
>>
>>> This seems to be a common problem with the older style two piece
>>> 928GTS/993 big reds or blacks.  I had a brand new set that did it  
>>> right from
>>> day 1.
>>>
>>> I tried everything and could not get it to go away, so I returned  
>>> them and
>>> temporarily replaced them with 996 C4 calipers while I wait for my  
>>> 996TT big
>>> reds.  Problem went away immediately when I put the 996 calipers on.
>>>
>>>  On Mon, Jun 7, 2010 at 9:27 AM, Abe Berman  
>>> <yellowcuda at gmail.com>wrote:
>>>
>>>> Patient - 95.5 Avant mit Porsche "Big Red" front calipers
>>>>
>>>> Has anyone had problems with sticky Porsche calipers?
>>>>
>>>> I have been experiencing incidences of shuddering on the highway  
>>>> and feel
>>>> it
>>>> slightly (but intermittently) around town at lower speeds.  Checked
>>>> balance
>>>> on all 4 wheels and its fine.  Tires are new and have no external
>>>> defects.
>>>>
>>>> I experienced this to a HEAVY degree whilst on the highway on  
>>>> Friday and
>>>> immediately pulled off at an exit.  Front Left wheel had serious  
>>>> heat
>>>> radiating off of it and a strong brake smell, all others were  
>>>> normal.
>>>>
>>>> I did some reading and it seems like the correct procedure would  
>>>> be to
>>>> clean
>>>> and lubricate slide pins and flush brake fluid/bleed brakes to  
>>>> eliminate
>>>> possible gunk/moisture in lines.
>>>>
>>>> The Big Reds were installed approximately 5 years/30k miles ago.
>>>>
>>>> Thanks in advance for any thoughts.
>>>>
>>>> Abe
>>>> Burlington, VT